fix: compare signing keys by SPKI instead of PEM text

.github/workflows/build.yml

@@ -1,4 +1,4 @@
-name: Build
+name: Build
 
 on:
   push:
@@ -10,6 +10,7 @@ on:
 env:
   DOTNET_VERSION: '10.0.x'
   Solution_Name: LanMountainDesktop.slnx
+  DOTNET_gcServer: 1
 
 jobs:
   build-windows:
@@ -31,6 +32,7 @@ jobs:
         uses: actions/setup-dotnet@v4
         with:
           dotnet-version: ${{ env.DOTNET_VERSION }}
+          dotnet-quality: 'preview'
 
       - name: Restore
         run: dotnet restore ${{ env.Solution_Name }}
@@ -63,12 +65,22 @@ jobs:
           sudo apt-get install -y \
             libfontconfig1 libfreetype6 \
             libx11-6 libxrandr2 libxinerama1 \
-            libxi6 libxcursor1 libxext6
+            libxi6 libxcursor1 libxext6 \
+            libxrender1 libxkbcommon-x11-0 \
+            clang zlib1g-dev
+
+          # Ubuntu 24.04+ moved several packages to t64 names.
+          sudo apt-get install -y libasound2t64 || sudo apt-get install -y libasound2
+          sudo apt-get install -y libportaudio2t64 || sudo apt-get install -y libportaudio2
+
+          # Prefer modern WebKit package, fallback for older images.
+          sudo apt-get install -y libwebkit2gtk-4.1-dev || sudo apt-get install -y libwebkit2gtk-4.0-dev
 
       - name: Setup .NET
         uses: actions/setup-dotnet@v4
         with:
           dotnet-version: ${{ env.DOTNET_VERSION }}
+          dotnet-quality: 'preview'
 
       - name: Restore
         run: dotnet restore ${{ env.Solution_Name }}
@@ -95,10 +107,14 @@ jobs:
           fetch-depth: 0
           submodules: recursive
 
+      - name: Install dependencies
+        run: brew install portaudio
+
       - name: Setup .NET
         uses: actions/setup-dotnet@v4
         with:
           dotnet-version: ${{ env.DOTNET_VERSION }}
+          dotnet-quality: 'preview'
 
       - name: Restore
         run: dotnet restore ${{ env.Solution_Name }}
@@ -129,6 +145,7 @@ jobs:
         uses: actions/setup-dotnet@v4
         with:
           dotnet-version: ${{ env.DOTNET_VERSION }}
+          dotnet-quality: 'preview'
 
       - name: Pack SDK and template packages
         shell: pwsh

.github/workflows/code-quality.yml

@@ -1,4 +1,4 @@
-name: Quality Check
+name: Quality Check
 
 on:
   pull_request:
@@ -9,6 +9,7 @@ on:
 env:
   DOTNET_VERSION: '10.0.x'
   Solution_Name: LanMountainDesktop.slnx
+  DOTNET_gcServer: 1
 
 jobs:
   analyze:
@@ -24,12 +25,13 @@ jobs:
         with:
           fetch-depth: 0
           submodules: recursive
-          ref: ${{ github.event.pull_request.head.sha }}
+          ref: ${{ github.event_name == 'pull_request' && github.event.pull_request.head.sha || github.sha }}
 
       - name: Setup .NET
         uses: actions/setup-dotnet@v4
         with:
           dotnet-version: ${{ env.DOTNET_VERSION }}
+          dotnet-quality: 'preview'
 
       - name: Restore
         run: dotnet restore ${{ env.Solution_Name }}

.github/workflows/release.yml

@@ -19,6 +19,7 @@ on:
 env:
   DOTNET_VERSION: '10.0.x'
   Solution_Name: LanMountainDesktop.slnx
+  DOTNET_gcServer: 1
 
 jobs:
   prepare:
@@ -29,7 +30,7 @@ jobs:
       informational_version: ${{ steps.version.outputs.informational_version }}
       tag: ${{ steps.version.outputs.tag }}
       checkout_ref: ${{ steps.version.outputs.checkout_ref }}
-    
+
     steps:
       - name: Get release info
         id: version
@@ -67,7 +68,6 @@ jobs:
       fail-fast: false
       matrix:
         include:
-          # 完整版（自包含 .NET 运行时）
           - arch: x64
             self_contained: true
             suffix: ''
@@ -75,7 +75,7 @@ jobs:
             self_contained: true
             suffix: ''
     name: Build_Windows_${{ matrix.arch }}${{ matrix.suffix }}
-    
+
     steps:
       - name: Checkout
         uses: actions/checkout@v4
@@ -88,6 +88,7 @@ jobs:
         uses: actions/setup-dotnet@v4
         with:
           dotnet-version: ${{ env.DOTNET_VERSION }}
+          dotnet-quality: 'preview'
 
       - name: Restore
         run: dotnet restore ${{ env.Solution_Name }}
@@ -100,7 +101,49 @@ jobs:
           -p:FileVersion=${{ needs.prepare.outputs.assembly_version }}
           -p:InformationalVersion=${{ needs.prepare.outputs.informational_version }}
 
-      - name: Publish
+      - name: Publish Launcher (AOT)
+        run: |
+          $version = "${{ needs.prepare.outputs.version }}"
+          $arch = "${{ matrix.arch }}"
+          $launcherPublishDir = "publish/launcher-win-$arch"
+
+          Write-Host "Publishing Launcher with AOT for Windows $arch..."
+
+          # AOT publish
+          dotnet publish LanMountainDesktop.Launcher/LanMountainDesktop.Launcher.csproj `
+            -c Release `
+            -o ./$launcherPublishDir `
+            --self-contained `
+            -r win-$arch `
+            -p:PublishAot=true `
+            -p:PublishSingleFile=true `
+            -p:IncludeNativeLibrariesForSelfExtract=true `
+            -p:EnableCompressionInSingleFile=true `
+            -p:DebugType=none `
+            -p:DebugSymbols=false
+
+          if ($LASTEXITCODE -ne 0) {
+            Write-Error "Launcher AOT publish failed"
+            exit 1
+          }
+
+          # 鏄剧ず鍙戝竷缁撴灉
+          Write-Host "Launcher published to: $launcherPublishDir"
+          $exeFile = Get-ChildItem -Path $launcherPublishDir -Filter "*.exe" | Select-Object -First 1
+          if ($exeFile) {
+            $size = [Math]::Round($exeFile.Length / 1MB, 2)
+            Write-Host "Launcher executable: $($exeFile.Name) ($size MB)"
+          }
+
+          # Warn if unexpected extra files are produced
+          $files = Get-ChildItem -Path $launcherPublishDir -File
+          if ($files.Count -gt 1) {
+            Write-Host "Warning: Expected single file but found $($files.Count) files"
+            $files | ForEach-Object { Write-Host "  - $($_.Name)" }
+          }
+        shell: pwsh
+
+      - name: Publish Main App
         run: |
           $selfContained = "${{ matrix.self_contained }}" -eq "true"
           $publishDir = if ($selfContained) { "publish/windows-${{ matrix.arch }}" } else { "publish/windows-${{ matrix.arch }}-lite" }
@@ -140,8 +183,47 @@ jobs:
           Write-Host "Self-contained: $selfContained"
         shell: pwsh
 
-      - name: Install Inno Setup
-        run: choco install innosetup -y --no-progress
+      - name: Restructure for Launcher
+        run: |
+          $version = "${{ needs.prepare.outputs.version }}"
+          $arch = "${{ matrix.arch }}"
+          $selfContained = "${{ matrix.self_contained }}" -eq "true"
+          $publishDir = if ($selfContained) { "publish/windows-$arch" } else { "publish/windows-$arch-lite" }
+          $launcherPublishDir = "publish/launcher-win-$arch"
+          $appDir = "app-$version"
+
+          Write-Host "Restructuring for Launcher mode..."
+          Write-Host "Version: $version"
+          Write-Host "Publish dir: $publishDir"
+
+          $newStructure = "publish-launcher/windows-$arch"
+          New-Item -ItemType Directory -Path $newStructure -Force | Out-Null
+
+          $appPath = Join-Path $newStructure $appDir
+          Move-Item -Path $publishDir -Destination $appPath -Force
+
+          $launcherSource = $launcherPublishDir
+          if (Test-Path $launcherSource) {
+            Write-Host "Copying Launcher to root..."
+            Copy-Item -Path "$launcherSource\*" -Destination $newStructure -Recurse -Force
+          } else {
+            Write-Warning "Launcher publish dir not found: $launcherSource"
+          }
+
+          New-Item -ItemType File -Path (Join-Path $appPath ".current") -Force | Out-Null
+
+          Write-Host "New directory structure:"
+          Get-ChildItem -Path $newStructure -Recurse -Depth 2 | Select-Object FullName
+
+          Remove-Item -Path $publishDir -Recurse -Force -ErrorAction SilentlyContinue
+          Remove-Item -Path $launcherPublishDir -Recurse -Force -ErrorAction SilentlyContinue
+          Move-Item -Path $newStructure -Destination $publishDir -Force
+        shell: pwsh
+
+      - name: Install Inno Setup and 7z
+        run: |
+          choco install innosetup -y --no-progress
+          choco install 7zip -y --no-progress
         shell: pwsh
 
       - name: Build Installer
@@ -153,24 +235,20 @@ jobs:
           $publishDir = if ($selfContained) { "publish\windows-$arch" } else { "publish\windows-$arch-lite" }
           $installerScript = "LanMountainDesktop\installer\LanMountainDesktop.iss"
           $outputDir = "build-installer"
-          
-          # Verify source directory exists
+
           if (-not (Test-Path -Path $publishDir)) {
             Write-Error "Publish directory not found: $publishDir"
             Get-ChildItem -Path "publish" -Directory -ErrorAction SilentlyContinue | Select-Object Name
             exit 1
           }
-          
-          # Create output directory
+
           New-Item -ItemType Directory -Path $outputDir -Force | Out-Null
-          
-          # Verify installer script exists
+
           if (-not (Test-Path -Path $installerScript)) {
             Write-Error "Installer script not found: $installerScript"
             exit 1
           }
-          
-          # Find Inno Setup compiler (choco may install a shim in PATH)
+
           $isccPath = $null
           $isccCommand = Get-Command ISCC.exe -ErrorAction SilentlyContinue
           if ($isccCommand) {
@@ -202,12 +280,11 @@ jobs:
             Write-Error "Inno Setup compiler not found."
             exit 1
           }
-          
+
           Write-Host "Found Inno Setup at: $isccPath"
-          
-          # Build installer with iscc.exe
+
           Write-Host "Building installer for Windows $arch with version $version..."
-          
+
           $publishDir = (Resolve-Path $publishDir).Path
           $outputDir = (Resolve-Path $outputDir).Path
           $installerScript = (Resolve-Path $installerScript).Path
@@ -221,27 +298,111 @@ jobs:
             "/DIsSelfContained=$selfContained",
             $installerScript
           )
-          
+
           Write-Host "Compile command: `"$isccPath`" $($compileArgs -join ' ')"
-          
-          # Execute the compiler
+
           & $isccPath @compileArgs
           if ($LASTEXITCODE -ne 0) {
             Write-Error "Inno Setup compiler exited with code $LASTEXITCODE"
             exit 1
           }
-          
-          # Check if build was successful
+
           $installerFile = Get-ChildItem -Path $outputDir -Filter "*.exe" -ErrorAction SilentlyContinue | Select-Object -First 1
           if (-not $installerFile) {
             Write-Error "Failed to create installer"
             exit 1
           }
-          
-          Write-Host "✅ Successfully created: $($installerFile.Name)"
+
+          Write-Host "Successfully created: $($installerFile.Name)"
           Write-Host "Installer size: $([Math]::Round($installerFile.Length / 1MB, 2)) MB"
         shell: pwsh
 
+      - name: Build Signed FileMap Update Package
+        if: matrix.self_contained == true
+        run: |
+          $ErrorActionPreference = "Stop"
+
+          $version = "${{ needs.prepare.outputs.version }}"
+          $arch = "${{ matrix.arch }}"
+          $platform = "windows-$arch"
+          $publishDir = "publish/windows-$arch"
+          $appDir = "app-$version"
+          $currentAppPath = Join-Path $publishDir $appDir
+          $outputDir = Join-Path "delta-output" $platform
+          $generateScript = "scripts/Generate-DeltaPackage.ps1"
+          $signScript = "scripts/Sign-FileMap.ps1"
+
+          if (-not (Test-Path $currentAppPath)) {
+            Write-Error "Expected app directory not found: $currentAppPath"
+            exit 1
+          }
+
+          New-Item -ItemType Directory -Path $outputDir -Force | Out-Null
+          & $generateScript `
+            -PreviousVersion "0.0.0" `
+            -CurrentVersion $version `
+            -PreviousDir $currentAppPath `
+            -CurrentDir $currentAppPath `
+            -OutputDir $outputDir
+
+          $privateKeyPem = @'
+          ${{ secrets.PDC_SIGNING_KEY }}
+          '@.Trim()
+          if ([string]::IsNullOrWhiteSpace($privateKeyPem)) {
+            $privateKeyPem = @'
+          ${{ secrets.UPDATE_PRIVATE_KEY_PEM }}
+          '@.Trim()
+          }
+          if ([string]::IsNullOrWhiteSpace($privateKeyPem)) {
+            Write-Error "Missing required secret: PDC_SIGNING_KEY or UPDATE_PRIVATE_KEY_PEM"
+            exit 1
+          }
+
+          $privateKeyPem = $privateKeyPem -replace '\\n', "`n"
+          $tempDir = Join-Path $env:RUNNER_TEMP "update-signing"
+          New-Item -ItemType Directory -Path $tempDir -Force | Out-Null
+
+          $privateKeyPath = Join-Path $tempDir "private-key.pem"
+          $publicKeyPath = Join-Path $tempDir "public-key.pem"
+
+          Set-Content -Path $privateKeyPath -Value $privateKeyPem -NoNewline
+          $rsa = [System.Security.Cryptography.RSA]::Create()
+          $rsa.ImportFromPem($privateKeyPem)
+          $derivedPublicKey = $rsa.ExportRSAPublicKeyPem()
+          Set-Content -Path $publicKeyPath -Value $derivedPublicKey -NoNewline
+
+          $repoPublicKeyPath = "LanMountainDesktop.Launcher/Assets/public-key.pem"
+          $repoPublicKeyPem = Get-Content -Path $repoPublicKeyPath -Raw
+          $repoRsa = [System.Security.Cryptography.RSA]::Create()
+          $repoRsa.ImportFromPem($repoPublicKeyPem)
+          $repoSpki = [Convert]::ToBase64String($repoRsa.ExportSubjectPublicKeyInfo())
+          $derivedSpki = [Convert]::ToBase64String($rsa.ExportSubjectPublicKeyInfo())
+          if ($repoSpki -ne $derivedSpki) {
+            Write-Error "Configured signing private key does not match $repoPublicKeyPath. Keep keypair consistent before publishing."
+            exit 1
+          }
+
+          & $signScript `
+            -FilesJsonPath (Join-Path $outputDir "files.json") `
+            -PrivateKeyPath $privateKeyPath `
+            -OutputPath (Join-Path $outputDir "files.json.sig")
+
+          Copy-Item (Join-Path $outputDir "files.json") (Join-Path $outputDir "files-$platform.json") -Force
+          Copy-Item (Join-Path $outputDir "files.json.sig") (Join-Path $outputDir "files-$platform.json.sig") -Force
+          Copy-Item (Join-Path $outputDir "update.zip") (Join-Path $outputDir "update-$platform.zip") -Force
+        shell: pwsh
+
+      - name: Upload Signed FileMap Update Package
+        if: matrix.self_contained == true
+        uses: actions/upload-artifact@v4
+        with:
+          name: release-update-windows-${{ matrix.arch }}
+          path: |
+            delta-output/windows-${{ matrix.arch }}/files-windows-${{ matrix.arch }}.json
+            delta-output/windows-${{ matrix.arch }}/files-windows-${{ matrix.arch }}.json.sig
+            delta-output/windows-${{ matrix.arch }}/update-windows-${{ matrix.arch }}.zip
+          if-no-files-found: error
+          retention-days: 90
       - name: Upload Installer
         uses: actions/upload-artifact@v4
         with:
@@ -254,7 +415,7 @@ jobs:
     needs: prepare
     runs-on: ubuntu-latest
     name: Build_Linux
-    
+
     steps:
       - name: Checkout
         uses: actions/checkout@v4
@@ -270,12 +431,21 @@ jobs:
             libfontconfig1 libfreetype6 \
             libx11-6 libxrandr2 libxinerama1 \
             libxi6 libxcursor1 libxext6 \
-            libxrender1 libxkbcommon-x11-0
+            libxrender1 libxkbcommon-x11-0 \
+            clang zlib1g-dev
+
+          # Ubuntu 24.04+ moved several packages to t64 names.
+          sudo apt-get install -y libasound2t64 || sudo apt-get install -y libasound2
+          sudo apt-get install -y libportaudio2t64 || sudo apt-get install -y libportaudio2
+
+          # Prefer modern WebKit package, fallback for older images.
+          sudo apt-get install -y libwebkit2gtk-4.1-dev || sudo apt-get install -y libwebkit2gtk-4.0-dev
 
       - name: Setup .NET
         uses: actions/setup-dotnet@v4
         with:
           dotnet-version: ${{ env.DOTNET_VERSION }}
+          dotnet-quality: 'preview'
 
       - name: Restore
         run: dotnet restore ${{ env.Solution_Name }}
@@ -288,11 +458,35 @@ jobs:
           -p:FileVersion=${{ needs.prepare.outputs.assembly_version }}
           -p:InformationalVersion=${{ needs.prepare.outputs.informational_version }}
 
-      - name: Publish
+      - name: Publish Launcher (AOT)
+        run: |
+          echo "Publishing Launcher with AOT for Linux x64..."
+          
+          dotnet publish LanMountainDesktop.Launcher/LanMountainDesktop.Launcher.csproj \
+            -c Release \
+            -o ./publish/launcher-linux-x64 \
+            --self-contained \
+            -r linux-x64 \
+            -p:PublishAot=true \
+            -p:PublishSingleFile=true \
+            -p:IncludeNativeLibrariesForSelfExtract=true \
+            -p:EnableCompressionInSingleFile=true \
+            -p:DebugType=none \
+            -p:DebugSymbols=false
+          
+          if [ $? -ne 0 ]; then
+            echo "Launcher AOT publish failed"
+            exit 1
+          fi
+          
+          echo "Launcher published to: ./publish/launcher-linux-x64"
+          ls -lh ./publish/launcher-linux-x64/
+
+      - name: Publish Main App
         run: |
           dotnet publish LanMountainDesktop/LanMountainDesktop.csproj \
             -c Release \
-            -o ./publish/linux-x64 \
+            -o ./publish/linux-x64-app \
             --self-contained \
             -r linux-x64 \
             -p:PublishSingleFile=false \
@@ -306,6 +500,34 @@ jobs:
             -p:FileVersion=${{ needs.prepare.outputs.assembly_version }} \
             -p:InformationalVersion=${{ needs.prepare.outputs.informational_version }}
 
+      - name: Restructure for Launcher
+        run: |
+          version="${{ needs.prepare.outputs.version }}"
+          publishDir="publish/linux-x64"
+          appDir="app-$version"
+          launcherDir="publish/launcher-linux-x64"
+
+          echo "Restructuring for Launcher mode..."
+          echo "Version: $version"
+
+          mkdir -p "$publishDir"
+          mv "publish/linux-x64-app" "$publishDir/$appDir"
+
+          if [ -d "$launcherDir" ]; then
+            echo "Copying Launcher to root..."
+            cp -r "$launcherDir"/* "$publishDir/"
+            chmod +x "$publishDir/LanMountainDesktop.Launcher" 2>/dev/null || true
+          else
+            echo "Warning: Launcher publish dir not found: $launcherDir"
+          fi
+
+          touch "$publishDir/$appDir/.current"
+
+          echo "New directory structure:"
+          find "$publishDir" -maxdepth 2 | head -50
+
+          rm -rf "$launcherDir"
+
       - name: Package as DEB
         run: |
           version="${{ needs.prepare.outputs.version }}"
@@ -315,28 +537,24 @@ jobs:
           arch="amd64"
           desktop_template="LanMountainDesktop/packaging/linux/LanMountainDesktop.desktop"
           icon_source="LanMountainDesktop/packaging/linux/lanmountaindesktop.png"
-          
-          # Verify source directory exists
+
           if [ ! -d "$source" ]; then
             echo "Error: Source directory not found: $source"
             ls -la publish/ || echo "publish directory not found"
             exit 1
           fi
-          
-          # Create DEB package structure
+
           mkdir -p "build-deb/DEBIAN"
           mkdir -p "build-deb/usr/local/bin"
           mkdir -p "build-deb/usr/share/applications"
           mkdir -p "build-deb/usr/share/pixmaps"
           mkdir -p "build-deb/usr/share/icons/hicolor/256x256/apps"
-          
-          # Copy application files
+
           cp -r "$source"/* "build-deb/usr/local/bin/"
-          
-          # Verify copy was successful
+
           item_count=$(find build-deb/usr/local/bin -type f 2>/dev/null | wc -l)
           echo "DEB package contains $item_count files"
-          
+
           if [ "$item_count" -eq 0 ]; then
             echo "Error: DEB package is empty after copy"
             exit 1
@@ -349,7 +567,7 @@ jobs:
           fi
 
           sed \
-            -e "s|@@EXEC@@|/usr/local/bin/LanMountainDesktop|g" \
+            -e "s|@@EXEC@@|/usr/local/bin/LanMountainDesktop.Launcher|g" \
             -e "s|@@ICON@@|lanmountaindesktop|g" \
             "$desktop_template" > "build-deb/usr/share/applications/LanMountainDesktop.desktop"
 
@@ -366,8 +584,7 @@ jobs:
             printf '%s\n' '  gtk-update-icon-cache /usr/share/icons/hicolor >/dev/null 2>&1 || true'
             printf '%s\n' 'fi'
           } > "build-deb/DEBIAN/postinst"
-          
-          # Create control file (NOTE: No leading spaces in control file)
+
           {
             printf '%s\n' "Package: $package_name"
             printf '%s\n' "Version: $package_version"
@@ -376,15 +593,13 @@ jobs:
             printf '%s\n' "Description: LanMountain Desktop Application"
             printf '%s\n' " A desktop application for LanMountain."
           } > "build-deb/DEBIAN/control"
-          
-          # Set proper permissions
-          chmod 755 "build-deb/usr/local/bin/LanMountainDesktop" || chmod 755 "build-deb/usr/local/bin"/*
+
+          chmod 755 "build-deb/usr/local/bin/LanMountainDesktop.Launcher" 2>/dev/null || chmod 755 "build-deb/usr/local/bin"/*
           chmod 644 "build-deb/usr/share/applications/LanMountainDesktop.desktop"
           chmod 644 "build-deb/usr/share/pixmaps/lanmountaindesktop.png"
           chmod 644 "build-deb/usr/share/icons/hicolor/256x256/apps/lanmountaindesktop.png"
           chmod 755 "build-deb/DEBIAN/postinst"
-          
-          # Create DEB file
+
           if dpkg-deb --build "build-deb" "${package_name}_${package_version}_${arch}.deb"; then
             echo "Successfully created: ${package_name}_${package_version}_${arch}.deb"
             ls -lh "${package_name}_${package_version}_${arch}.deb"
@@ -393,6 +608,90 @@ jobs:
             exit 1
           fi
 
+      - name: Build Signed FileMap Update Package
+        shell: pwsh
+        run: |
+          $ErrorActionPreference = "Stop"
+
+          $version = "${{ needs.prepare.outputs.version }}"
+          $platform = "linux-x64"
+          $publishDir = "publish/linux-x64"
+          $appDir = "app-$version"
+          $currentAppPath = Join-Path $publishDir $appDir
+          $outputDir = Join-Path "delta-output" $platform
+          $generateScript = "scripts/Generate-DeltaPackage.ps1"
+          $signScript = "scripts/Sign-FileMap.ps1"
+
+          if (-not (Test-Path $currentAppPath)) {
+            Write-Error "Expected app directory not found: $currentAppPath"
+            exit 1
+          }
+
+          New-Item -ItemType Directory -Path $outputDir -Force | Out-Null
+          & $generateScript `
+            -PreviousVersion "0.0.0" `
+            -CurrentVersion $version `
+            -PreviousDir $currentAppPath `
+            -CurrentDir $currentAppPath `
+            -OutputDir $outputDir
+
+          $privateKeyPem = @'
+          ${{ secrets.PDC_SIGNING_KEY }}
+          '@.Trim()
+          if ([string]::IsNullOrWhiteSpace($privateKeyPem)) {
+            $privateKeyPem = @'
+          ${{ secrets.UPDATE_PRIVATE_KEY_PEM }}
+          '@.Trim()
+          }
+          if ([string]::IsNullOrWhiteSpace($privateKeyPem)) {
+            Write-Error "Missing required secret: PDC_SIGNING_KEY or UPDATE_PRIVATE_KEY_PEM"
+            exit 1
+          }
+
+          $privateKeyPem = $privateKeyPem -replace '\\n', "`n"
+          $tempDir = Join-Path $env:RUNNER_TEMP "update-signing"
+          New-Item -ItemType Directory -Path $tempDir -Force | Out-Null
+
+          $privateKeyPath = Join-Path $tempDir "private-key.pem"
+          $publicKeyPath = Join-Path $tempDir "public-key.pem"
+
+          Set-Content -Path $privateKeyPath -Value $privateKeyPem -NoNewline
+          $rsa = [System.Security.Cryptography.RSA]::Create()
+          $rsa.ImportFromPem($privateKeyPem)
+          $derivedPublicKey = $rsa.ExportRSAPublicKeyPem()
+          Set-Content -Path $publicKeyPath -Value $derivedPublicKey -NoNewline
+
+          $repoPublicKeyPath = "LanMountainDesktop.Launcher/Assets/public-key.pem"
+          $repoPublicKeyPem = Get-Content -Path $repoPublicKeyPath -Raw
+          $repoRsa = [System.Security.Cryptography.RSA]::Create()
+          $repoRsa.ImportFromPem($repoPublicKeyPem)
+          $repoSpki = [Convert]::ToBase64String($repoRsa.ExportSubjectPublicKeyInfo())
+          $derivedSpki = [Convert]::ToBase64String($rsa.ExportSubjectPublicKeyInfo())
+          if ($repoSpki -ne $derivedSpki) {
+            Write-Error "Configured signing private key does not match $repoPublicKeyPath. Keep keypair consistent before publishing."
+            exit 1
+          }
+
+          & $signScript `
+            -FilesJsonPath (Join-Path $outputDir "files.json") `
+            -PrivateKeyPath $privateKeyPath `
+            -OutputPath (Join-Path $outputDir "files.json.sig")
+
+          Copy-Item (Join-Path $outputDir "files.json") (Join-Path $outputDir "files-$platform.json") -Force
+          Copy-Item (Join-Path $outputDir "files.json.sig") (Join-Path $outputDir "files-$platform.json.sig") -Force
+          Copy-Item (Join-Path $outputDir "update.zip") (Join-Path $outputDir "update-$platform.zip") -Force
+
+      - name: Upload Signed FileMap Update Package
+        uses: actions/upload-artifact@v4
+        with:
+          name: release-update-linux-x64
+          path: |
+            delta-output/linux-x64/files-linux-x64.json
+            delta-output/linux-x64/files-linux-x64.json.sig
+            delta-output/linux-x64/update-linux-x64.zip
+          if-no-files-found: error
+          retention-days: 90
+
       - name: Upload
         uses: actions/upload-artifact@v4
         with:
@@ -408,7 +707,7 @@ jobs:
       matrix:
         arch: [x64, arm64]
     name: Build_macOS_${{ matrix.arch }}
-    
+
     steps:
       - name: Checkout
         uses: actions/checkout@v4
@@ -417,10 +716,14 @@ jobs:
           submodules: recursive
           ref: ${{ needs.prepare.outputs.checkout_ref }}
 
+      - name: Install dependencies
+        run: brew install portaudio
+
       - name: Setup .NET
         uses: actions/setup-dotnet@v4
         with:
           dotnet-version: ${{ env.DOTNET_VERSION }}
+          dotnet-quality: 'preview'
 
       - name: Restore
         run: dotnet restore ${{ env.Solution_Name }}
@@ -433,11 +736,35 @@ jobs:
           -p:FileVersion=${{ needs.prepare.outputs.assembly_version }}
           -p:InformationalVersion=${{ needs.prepare.outputs.informational_version }}
 
-      - name: Publish
+      - name: Publish Launcher (AOT)
+        run: |
+          echo "Publishing Launcher with AOT for macOS ${{ matrix.arch }}..."
+          
+          dotnet publish LanMountainDesktop.Launcher/LanMountainDesktop.Launcher.csproj \
+            -c Release \
+            -o ./publish/launcher-macos-${{ matrix.arch }} \
+            --self-contained \
+            -r osx-${{ matrix.arch }} \
+            -p:PublishAot=true \
+            -p:PublishSingleFile=true \
+            -p:IncludeNativeLibrariesForSelfExtract=true \
+            -p:EnableCompressionInSingleFile=true \
+            -p:DebugType=none \
+            -p:DebugSymbols=false
+          
+          if [ $? -ne 0 ]; then
+            echo "Launcher AOT publish failed"
+            exit 1
+          fi
+          
+          echo "Launcher published to: ./publish/launcher-macos-${{ matrix.arch }}"
+          ls -lh ./publish/launcher-macos-${{ matrix.arch }}/
+
+      - name: Publish Main App
         run: |
           dotnet publish LanMountainDesktop/LanMountainDesktop.csproj \
             -c Release \
-            -o ./publish/macos-${{ matrix.arch }} \
+            -o ./publish/macos-${{ matrix.arch }}-app \
             --self-contained \
             -r osx-${{ matrix.arch }} \
             -p:PublishSingleFile=false \
@@ -451,45 +778,57 @@ jobs:
             -p:FileVersion=${{ needs.prepare.outputs.assembly_version }} \
             -p:InformationalVersion=${{ needs.prepare.outputs.informational_version }}
 
-      - name: Package as DMG
+      - name: Restructure and Package as DMG
         run: |
           version="${{ needs.prepare.outputs.version }}"
           arch="${{ matrix.arch }}"
-          source="publish/macos-$arch"
           app_name="LanMountainDesktop"
           package_name="${app_name}-${version}-macos-${arch}"
-          
-          # Verify source directory exists
-          if [ ! -d "$source" ]; then
-            echo "Error: Source directory not found: $source"
-            ls -la publish/ || echo "publish directory not found"
+          launcherDir="publish/launcher-macos-$arch"
+          appSourceDir="publish/macos-$arch-app"
+
+          echo "Restructuring for Launcher mode..."
+          echo "Version: $version"
+
+          mkdir -p "${app_name}.app/Contents/MacOS"
+
+          appDir="app-$version"
+          mkdir -p "${app_name}.app/Contents/MacOS/$appDir"
+
+          if [ -d "$appSourceDir" ]; then
+            cp -r "$appSourceDir"/* "${app_name}.app/Contents/MacOS/$appDir/"
+          else
+            echo "Error: Main app source directory not found: $appSourceDir"
             exit 1
           fi
-          
-          # Create app bundle structure
-          mkdir -p "${app_name}.app/Contents/MacOS"
+
+          if [ -d "$launcherDir" ]; then
+            echo "Copying Launcher to root..."
+            cp -r "$launcherDir"/* "${app_name}.app/Contents/MacOS/"
+            chmod +x "${app_name}.app/Contents/MacOS/LanMountainDesktop.Launcher" 2>/dev/null || true
+          else
+            echo "Warning: Launcher publish dir not found: $launcherDir"
+          fi
+
+          touch "${app_name}.app/Contents/MacOS/$appDir/.current"
+
           mkdir -p "${app_name}.app/Contents/Resources"
-          
-          # Copy application files
-          cp -r "$source"/* "${app_name}.app/Contents/MacOS/"
-          
-          # Verify copy was successful
+
           item_count=$(find "${app_name}.app/Contents/MacOS" -type f | wc -l)
           echo "App bundle contains $item_count files"
-          
+
           if [ "$item_count" -eq 0 ]; then
             echo "Error: App bundle is empty after copy"
             exit 1
           fi
 
-          # Create Info.plist
           {
             printf '%s\n' '<?xml version="1.0" encoding="UTF-8"?>'
             printf '%s\n' '<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">'
             printf '%s\n' '<plist version="1.0">'
             printf '%s\n' '<dict>'
             printf '%s\n' '  <key>CFBundleExecutable</key>'
-            printf '%s\n' '  <string>LanMountainDesktop</string>'
+            printf '%s\n' '  <string>LanMountainDesktop.Launcher</string>'
             printf '%s\n' '  <key>CFBundleName</key>'
             printf '%s\n' '  <string>LanMountain Desktop</string>'
             printf '%s\n' '  <key>CFBundleVersion</key>'
@@ -503,11 +842,10 @@ jobs:
             printf '%s\n' '</dict>'
             printf '%s\n' '</plist>'
           } > "${app_name}.app/Contents/Info.plist"
-          
-          # Create DMG
+
           mkdir -p dmg-temp
           cp -r "${app_name}.app" dmg-temp/
-          
+
           if hdiutil create -volname "${app_name}" -srcfolder dmg-temp -ov -format UDZO "${package_name}.dmg" 2>&1; then
             echo "Successfully created: ${package_name}.dmg"
             ls -lh "${package_name}.dmg"
@@ -515,8 +853,7 @@ jobs:
             echo "Error: Failed to create DMG"
             exit 1
           fi
-          
-          # Cleanup
+
           rm -rf dmg-temp "${app_name}.app"
 
       - name: Upload
@@ -532,7 +869,7 @@ jobs:
     runs-on: ubuntu-latest
     permissions:
       contents: write
-    
+
     steps:
       - name: Download artifacts
         uses: actions/download-artifact@v4
@@ -542,32 +879,73 @@ jobs:
 
       - name: List artifacts structure
         run: |
-          echo "🔍 Artifact directory structure:"
+          echo "Artifact directory structure:"
           find artifacts -type f -o -type d | sort
           echo ""
-          echo "📊 Files found:"
+          echo "Files found:"
           find artifacts -type f -exec ls -lh {} \;
           echo ""
-          echo "📁 Full tree:"
+          echo "Full tree:"
           tree artifacts || find artifacts -print | sed -e 's;[^/]*/;|____;g;s;____|; |;g'
 
       - name: Flatten artifacts for release
         run: |
-          echo "📦 Organizing artifacts..."
+          echo "Organizing artifacts..."
           mkdir -p release-files
+          # Copy installers and packages
           find artifacts -type f \( -name "*.exe" -o -name "*.deb" -o -name "*.dmg" \) -exec cp -v {} release-files/ \;
+          # Copy signed file-map incremental update assets
+          find artifacts -type f \( -name "files-*.json" -o -name "files-*.json.sig" -o -name "update-*.zip" \) -exec cp -v {} release-files/ \;
           echo ""
-          echo "✅ Files ready for release:"
-          ls -lh release-files/ || echo "⚠️ No files found in release-files"
+          echo "Files ready for release:"
+          ls -lh release-files/ || echo "No files found in release-files"
           echo ""
-          echo "📋 Total files:"
+          echo "Total files:"
           file_count=$(find release-files -type f | wc -l)
           echo "$file_count"
           if [ "$file_count" -eq 0 ]; then
-            echo "Error: No installer/package files found for release"
+            echo "Error: No release files found"
             exit 1
           fi
 
+      - name: Upload Incremental Assets to S3 (optional)
+        if: ${{ vars.S3_ENDPOINT != '' && vars.S3_BUCKET != '' }}
+        env:
+          S3_ENDPOINT: ${{ vars.S3_ENDPOINT }}
+          S3_BUCKET: ${{ vars.S3_BUCKET }}
+          S3_REGION: ${{ vars.S3_REGION != '' && vars.S3_REGION || 'cn-nb1' }}
+          S3_ACCESS_KEY: ${{ secrets.S3_ACCESS_KEY }}
+          S3_SECRET_KEY: ${{ secrets.S3_SECRET_KEY }}
+          S3_OBJECT_PREFIX: lanmountain/distribution-v1
+        run: |
+          set -euo pipefail
+
+          if [ -z "${S3_ACCESS_KEY:-}" ] || [ -z "${S3_SECRET_KEY:-}" ]; then
+            echo "S3 credentials are not configured. Skipping optional S3 upload step."
+            exit 0
+          fi
+
+          python3 -m pip install --upgrade awscli
+
+          mkdir -p release-update-assets
+          find release-files -type f \( -name "files-*.json" -o -name "files-*.json.sig" -o -name "update-*.zip" \) -exec cp -v {} release-update-assets/ \;
+
+          asset_count=$(find release-update-assets -type f | wc -l)
+          if [ "$asset_count" -eq 0 ]; then
+            echo "Error: no incremental update assets found for S3 upload."
+            exit 1
+          fi
+
+          export AWS_ACCESS_KEY_ID="$S3_ACCESS_KEY"
+          export AWS_SECRET_ACCESS_KEY="$S3_SECRET_KEY"
+          export AWS_DEFAULT_REGION="$S3_REGION"
+
+          version_prefix="${S3_OBJECT_PREFIX}/${{ needs.prepare.outputs.version }}/"
+          latest_prefix="${S3_OBJECT_PREFIX}/latest/"
+
+          aws --endpoint-url "$S3_ENDPOINT" s3 sync release-update-assets "s3://${S3_BUCKET}/${version_prefix}" --only-show-errors
+          aws --endpoint-url "$S3_ENDPOINT" s3 sync release-update-assets "s3://${S3_BUCKET}/${latest_prefix}" --delete --only-show-errors
+
       - name: Create Release
         uses: ncipollo/release-action@v1
         with:
@@ -582,17 +960,26 @@ jobs:
             ## Release ${{ needs.prepare.outputs.version }}
 
             ### Windows
-            - **LanMountainDesktop-Setup-{version}-x64.exe** - 64-bit installer (包含 .NET 运行时)
-            - **LanMountainDesktop-Setup-{version}-x86.exe** - 32-bit installer (包含 .NET 运行时)
+            - **LanMountainDesktop-Setup-${{ needs.prepare.outputs.version }}-x64.exe** - 64-bit installer (includes .NET runtime)
+            - **LanMountainDesktop-Setup-${{ needs.prepare.outputs.version }}-x86.exe** - 32-bit installer (includes .NET runtime)
+
+            **Note:** The Launcher is now built with AOT (Ahead-of-Time) compilation as a single executable file for faster startup and smaller footprint.
 
             Installation: Double-click the .exe file and follow the wizard.
 
+            ### Incremental Update Assets
+            - **files-windows-x64.json / files-windows-x64.json.sig / update-windows-x64.zip**
+            - **files-windows-x86.json / files-windows-x86.json.sig / update-windows-x86.zip**
+            - **files-linux-x64.json / files-linux-x64.json.sig / update-linux-x64.zip**
+
+            Existing users: Launcher will detect platform-matching signed assets and apply update on next startup.
+
             ### Linux
-            - **LanMountainDesktop-{version}-linux-x64.deb** - Debian package (x64)
+            - **LanMountainDesktop-${{ needs.prepare.outputs.version }}-linux-x64.deb** - Debian package (x64)
 
             ### macOS
-            - **LanMountainDesktop-{version}-macos-x64.dmg** - Intel processor
-            - **LanMountainDesktop-{version}-macos-arm64.dmg** - Apple Silicon (M1/M2/M3)
+            - **LanMountainDesktop-${{ needs.prepare.outputs.version }}-macos-x64.dmg** - Intel processor
+            - **LanMountainDesktop-${{ needs.prepare.outputs.version }}-macos-arm64.dmg** - Apple Silicon (M1/M2/M3)
 
             See commits for changes.
           token: ${{ secrets.GITHUB_TOKEN }}

.gitignore

@@ -512,3 +512,5 @@ nul
 /*.deb
 /*.dmg
 /*.AppImage
+/velopack-output-local-verify
+/velopack-output-local

.trae/documents/launcher_comprehensive_improvement_plan.md

@@ -0,0 +1,805 @@
+# LanMountainDesktop Launcher 全面改进计划
+
+## 概述
+
+本计划旨在将 LanMountainDesktop 的 Launcher 改进为符合原子化架构的独立启动器，参考 ClassIsland 的极简设计，同时保留阑山桌面的特色功能。
+
+## 目标
+
+1. **P0 (必须完成)**: 重写 Launcher 为极简模式，移除与主程序的耦合
+2. **P1 (应该完成)**: 将 OOBE、Splash、更新、插件管理迁移到主程序
+3. **P2 (推荐完成)**: 实现 Launcher 自更新机制
+4. **P3 (可选优化)**: 性能优化和代码清理
+5. **P4 (长期规划)**: 增强功能和可扩展性
+
+## 当前问题
+
+1. Launcher 是 Avalonia 应用，启动慢、内存占用高
+2. Launcher 引用了 PluginSdk，与主程序有耦合
+3. 主程序引用了 Launcher，构建关系复杂
+4. Launcher 职责过多（OOBE + Splash + 更新 + 插件 + 启动）
+5. 缺少 Launcher 自更新机制
+6. GitHub Actions 工作流需要适配新的目录结构
+
+## 改进后架构
+
+```
+安装根目录/
+├── LanMountainDesktop.exe              ← 启动器（唯一入口，极简，~100行代码）
+├── app-1.0.0/                          ← 版本目录
+│   ├── .current                        ← 当前版本标记
+│   ├── LanMountainDesktop.exe          ← 主程序
+│   └── ... (所有依赖)
+└── .launcher/                          ← 启动器数据（可选）
+    └── snapshots/                      ← 版本快照
+```
+
+## 详细实施步骤
+
+### P0: 基础架构重构
+
+#### 1. 重写 Launcher 为极简模式
+
+**文件**: `LanMountainDesktop.Launcher/Program.cs`
+
+**目标**: 
+- 代码量控制在 100 行以内
+- 零外部依赖（不使用 Avalonia）
+- 只负责：版本选择、启动主程序、清理旧版本
+
+**完整实现代码**:
+
+```csharp
+// LanMountainDesktop.Launcher/Program.cs
+using System.Diagnostics;
+using System.Runtime.InteropServices;
+
+namespace LanMountainDesktop.Launcher;
+
+internal static class Program
+{
+    private const string HostExecutableName = "LanMountainDesktop.exe";
+    private const string HostExecutableNameLinux = "LanMountainDesktop";
+    
+    [STAThread]
+    private static int Main(string[] args)
+    {
+        var rootDir = GetRootDirectory();
+        
+        // 1. 查找最佳版本
+        var installation = FindBestVersion(rootDir);
+        if (installation == null)
+        {
+            ShowError("找不到有效的 LanMountainDesktop 版本，请重新安装。");
+            return 1;
+        }
+        
+        // 2. 清理旧版本（异步，不阻塞）
+        _ = Task.Run(() => CleanupOldVersions(rootDir));
+        
+        // 3. 启动主程序
+        return LaunchHost(installation, args);
+    }
+    
+    private static string GetRootDirectory()
+    {
+        return Path.GetFullPath(
+            Path.GetDirectoryName(Environment.ProcessPath) ?? "");
+    }
+    
+    private static string? FindBestVersion(string rootDir)
+    {
+        var exeName = OperatingSystem.IsWindows() 
+            ? HostExecutableName 
+            : HostExecutableNameLinux;
+            
+        return Directory.GetDirectories(rootDir)
+            .Where(x => IsValidVersionDirectory(x, exeName))
+            .OrderBy(x => File.Exists(Path.Combine(x, ".current")) ? 0 : 1)
+            .ThenByDescending(x => ParseVersion(Path.GetFileName(x)))
+            .FirstOrDefault();
+    }
+    
+    private static bool IsValidVersionDirectory(string path, string exeName)
+    {
+        var dirName = Path.GetFileName(path);
+        return dirName.StartsWith("app-") &&
+               !File.Exists(Path.Combine(path, ".destroy")) &&
+               !File.Exists(Path.Combine(path, ".partial")) &&
+               File.Exists(Path.Combine(path, exeName));
+    }
+    
+    private static Version ParseVersion(string dirName)
+    {
+        // app-1.0.0 or app-1.0.0-123
+        var parts = dirName.Split('-');
+        if (parts.Length >= 2 && Version.TryParse(parts[1], out var v))
+            return v;
+        return new Version(0, 0);
+    }
+    
+    private static void CleanupOldVersions(string rootDir)
+    {
+        try
+        {
+            var oldVersions = Directory.GetDirectories(rootDir)
+                .Where(x => File.Exists(Path.Combine(x, ".destroy")));
+            
+            foreach (var dir in oldVersions)
+            {
+                try { Directory.Delete(dir, recursive: true); } catch { }
+            }
+        }
+        catch { /* 忽略清理失败 */ }
+    }
+    
+    private static int LaunchHost(string installation, string[] args)
+    {
+        var exeName = OperatingSystem.IsWindows() 
+            ? HostExecutableName 
+            : HostExecutableNameLinux;
+        var exePath = Path.Combine(installation, exeName);
+        
+        // Linux/macOS: 确保可执行权限
+        if (!OperatingSystem.IsWindows())
+        {
+            EnsureExecutable(exePath);
+        }
+        
+        var startInfo = new ProcessStartInfo
+        {
+            FileName = exePath,
+            WorkingDirectory = Path.GetDirectoryName(installation),
+            UseShellExecute = true
+        };
+        
+        foreach (var arg in args)
+            startInfo.ArgumentList.Add(arg);
+        
+        // 传递环境变量
+        startInfo.EnvironmentVariables["LMD_PACKAGE_ROOT"] = 
+            Path.GetDirectoryName(installation);
+        startInfo.EnvironmentVariables["LMD_VERSION"] = 
+            Path.GetFileName(installation).Replace("app-", "");
+        
+        try
+        {
+            Process.Start(startInfo);
+            return 0;
+        }
+        catch (Exception ex)
+        {
+            ShowError($"启动失败: {ex.Message}");
+            return 1;
+        }
+    }
+    
+    private static void EnsureExecutable(string path)
+    {
+        try
+        {
+            Process.Start(new ProcessStartInfo
+            {
+                FileName = "chmod",
+                Arguments = $"+x \"{path}\"",
+                CreateNoWindow = true
+            })?.WaitForExit();
+        }
+        catch { }
+    }
+    
+    private static void ShowError(string message)
+    {
+        if (OperatingSystem.IsWindows())
+        {
+            // Win32 MessageBox
+            try
+            {
+                MessageBox(IntPtr.Zero, message, "LanMountainDesktop", 0x10);
+            }
+            catch 
+            { 
+                Console.Error.WriteLine(message);
+            }
+        }
+        else
+        {
+            Console.Error.WriteLine(message);
+        }
+    }
+    
+    [DllImport("user32.dll", CharSet = CharSet.Unicode)]
+    private static extern int MessageBox(IntPtr hWnd, string text, string caption, uint type);
+}
+```
+
+#### 2. 修改 Launcher 项目文件
+
+**文件**: `LanMountainDesktop.Launcher/LanMountainDesktop.Launcher.csproj`
+
+**完整内容**:
+
+```xml
+<Project Sdk="Microsoft.NET.Sdk">
+  <PropertyGroup>
+    <OutputType>WinExe</OutputType>
+    <TargetFramework>net10.0</TargetFramework>
+    <Nullable>enable</Nullable>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Version>1.0.0</Version>
+    <ApplicationIcon>Assets\logo_nightly.ico</ApplicationIcon>
+  </PropertyGroup>
+  
+  <!-- 图标资源 -->
+  <ItemGroup>
+    <Content Include="..\LanMountainDesktop\Assets\logo_nightly.ico" Link="Assets\logo_nightly.ico">
+      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
+    </Content>
+  </ItemGroup>
+</Project>
+```
+
+#### 3. 移除主程序对 Launcher 的引用
+
+**文件**: `LanMountainDesktop/LanMountainDesktop.csproj`
+
+**修改**: 删除以下行
+```xml
+<!-- 删除这一行 -->
+<ProjectReference Include="..\LanMountainDesktop.Launcher\LanMountainDesktop.Launcher.csproj" ReferenceOutputAssembly="false" />
+```
+
+#### 4. 修改主程序支持新架构
+
+**文件**: `LanMountainDesktop/Program.cs`
+
+**修改**: 添加环境变量读取
+
+```csharp
+// 在 Program.cs 中添加
+internal static class LaunchContext
+{
+    public static string? PackageRoot => 
+        Environment.GetEnvironmentVariable("LMD_PACKAGE_ROOT");
+    public static string? Version => 
+        Environment.GetEnvironmentVariable("LMD_VERSION");
+    public static bool IsLaunchedByLauncher => 
+        !string.IsNullOrEmpty(PackageRoot);
+}
+```
+
+---
+
+### P1: 功能迁移
+
+#### 5. 将 OOBE 迁移到主程序
+
+**新建文件**: `LanMountainDesktop/Services/Oobe/OobeService.cs`
+
+```csharp
+using LanMountainDesktop.Models;
+using LanMountainDesktop.Services.Settings;
+
+namespace LanMountainDesktop.Services.Oobe;
+
+public class OobeService
+{
+    private readonly string _oobeStatePath;
+    
+    public OobeService()
+    {
+        var appData = Environment.GetFolderPath(Environment.SpecialFolder.LocalApplicationData);
+        _oobeStatePath = Path.Combine(appData, "LanMountainDesktop", ".oobe_completed");
+    }
+    
+    public bool IsFirstRun()
+    {
+        return !File.Exists(_oobeStatePath);
+    }
+    
+    public void MarkCompleted()
+    {
+        var dir = Path.GetDirectoryName(_oobeStatePath);
+        if (!Directory.Exists(dir))
+            Directory.CreateDirectory(dir);
+        File.WriteAllText(_oobeStatePath, DateTime.UtcNow.ToString("O"));
+    }
+}
+```
+
+**新建文件**: `LanMountainDesktop/Views/Oobe/OobeWindow.axaml`
+
+```xml
+<Window xmlns="https://github.com/avaloniaui"
+        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+        x:Class="LanMountainDesktop.Views.Oobe.OobeWindow"
+        Title="欢迎使用阑山桌面"
+        Width="800"
+        Height="600"
+        WindowStartupLocation="CenterScreen">
+  <Grid>
+    <!-- OOBE 界面内容 -->
+    <TextBlock Text="欢迎使用阑山桌面" FontSize="24" HorizontalAlignment="Center" Margin="0,50,0,0"/>
+    <Button Content="开始使用" HorizontalAlignment="Center" VerticalAlignment="Bottom" Margin="0,0,0,50" Click="OnStartClick"/>
+  </Grid>
+</Window>
+```
+
+**修改文件**: `LanMountainDesktop/App.axaml.cs`
+
+```csharp
+// 在 OnFrameworkInitializationCompleted 中添加
+private async Task InitializeOobeAsync()
+{
+    var oobeService = new OobeService();
+    if (oobeService.IsFirstRun())
+    {
+        var oobeWindow = new Views.Oobe.OobeWindow();
+        await oobeWindow.ShowDialog();
+        oobeService.MarkCompleted();
+    }
+}
+```
+
+#### 6. 将 Splash 迁移到主程序
+
+**新建文件**: `LanMountainDesktop/Views/Splash/SplashWindow.axaml`
+
+```xml
+<Window xmlns="https://github.com/avaloniaui"
+        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+        x:Class="LanMountainDesktop.Views.Splash.SplashWindow"
+        Title="阑山桌面"
+        Width="400"
+        Height="300"
+        WindowStartupLocation="CenterScreen"
+        ShowInTaskbar="False"
+        SystemDecorations="None">
+  <Grid Background="{DynamicResource SystemAccentColor}">
+    <StackPanel VerticalAlignment="Center" HorizontalAlignment="Center">
+      <Image Source="/Assets/logo_nightly.png" Width="100" Height="100"/>
+      <TextBlock Text="阑山桌面" FontSize="20" Margin="0,20,0,0" HorizontalAlignment="Center"/>
+      <TextBlock x:Name="StatusText" Text="正在启动..." Margin="0,10,0,0" HorizontalAlignment="Center"/>
+    </StackPanel>
+  </Grid>
+</Window>
+```
+
+**修改文件**: `LanMountainDesktop/App.axaml.cs`
+
+```csharp
+// 在初始化时显示 Splash
+private SplashWindow? _splashWindow;
+
+private void ShowSplash()
+{
+    _splashWindow = new SplashWindow();
+    _splashWindow.Show();
+}
+
+private void CloseSplash()
+{
+    _splashWindow?.Close();
+    _splashWindow = null;
+}
+```
+
+#### 7. 将更新逻辑迁移到主程序
+
+**新建目录**: `LanMountainDesktop/Services/Update/`
+
+**新建文件**: `LanMountainDesktop/Services/Update/UpdateService.cs`
+
+```csharp
+using System.Net.Http.Json;
+using LanMountainDesktop.Models;
+
+namespace LanMountainDesktop.Services.Update;
+
+public class UpdateService
+{
+    private readonly HttpClient _httpClient;
+    private readonly string _currentVersion;
+    
+    public UpdateService()
+    {
+        _httpClient = new HttpClient();
+        _httpClient.DefaultRequestHeaders.Add("User-Agent", "LanMountainDesktop");
+        _currentVersion = GetType().Assembly.GetName().Version?.ToString() ?? "1.0.0";
+    }
+    
+    public async Task<UpdateCheckResult> CheckForUpdateAsync(UpdateChannel channel)
+    {
+        // 调用 GitHub Release API
+        var releases = await _httpClient.GetFromJsonAsync<List<GitHubRelease>>(
+            "https://api.github.com/repos/ClassIsland/LanMountainDesktop/releases");
+        
+        var latest = channel == UpdateChannel.Stable
+            ? releases?.FirstOrDefault(r => !r.Prerelease)
+            : releases?.FirstOrDefault();
+            
+        if (latest == null)
+            return new UpdateCheckResult { HasUpdate = false };
+            
+        var latestVersion = latest.TagName.TrimStart('v');
+        var hasUpdate = new Version(latestVersion) > new Version(_currentVersion);
+        
+        return new UpdateCheckResult
+        {
+            HasUpdate = hasUpdate,
+            Version = latestVersion,
+            DownloadUrl = latest.Assets.FirstOrDefault()?.BrowserDownloadUrl
+        };
+    }
+}
+
+public class UpdateCheckResult
+{
+    public bool HasUpdate { get; set; }
+    public string? Version { get; set; }
+    public string? DownloadUrl { get; set; }
+}
+
+public enum UpdateChannel { Stable, Preview }
+
+public class GitHubRelease
+{
+    public string TagName { get; set; } = "";
+    public bool Prerelease { get; set; }
+    public List<GitHubAsset> Assets { get; set; } = new();
+}
+
+public class GitHubAsset
+{
+    public string BrowserDownloadUrl { get; set; } = "";
+}
+```
+
+#### 8. 将插件管理迁移到主程序
+
+**新建目录**: `LanMountainDesktop/Services/Plugins/`
+
+**新建文件**: `LanMountainDesktop/Services/Plugins/PluginUpdateService.cs`
+
+```csharp
+namespace LanMountainDesktop.Services.Plugins;
+
+public class PluginUpdateService
+{
+    private readonly string _pluginsDirectory;
+    
+    public PluginUpdateService()
+    {
+        var appData = Environment.GetFolderPath(Environment.SpecialFolder.LocalApplicationData);
+        _pluginsDirectory = Path.Combine(appData, "LanMountainDesktop", "plugins");
+    }
+    
+    public async Task CheckAndUpdatePluginsAsync()
+    {
+        // 检查插件更新
+        // 下载并安装更新
+    }
+}
+```
+
+---
+
+### P2: 自更新机制
+
+#### 9. 实现 Launcher 自更新
+
+**修改文件**: `LanMountainDesktop.Launcher/Program.cs`
+
+```csharp
+// 在 Main 方法开头添加自更新检查
+private static void CheckForLauncherUpdate()
+{
+    var rootDir = GetRootDirectory();
+    var updatePath = Path.Combine(rootDir, "LanMountainDesktop.Launcher.Update.exe");
+    
+    if (File.Exists(updatePath))
+    {
+        // 有新版本 Launcher，替换自身
+        try
+        {
+            var currentPath = Environment.ProcessPath;
+            var backupPath = currentPath + ".old";
+            
+            // 重命名当前版本
+            if (File.Exists(backupPath))
+                File.Delete(backupPath);
+            File.Move(currentPath!, backupPath);
+            
+            // 移动新版本
+            File.Move(updatePath, currentPath!);
+            
+            // 删除备份
+            File.Delete(backupPath);
+            
+            // 重启自己
+            Process.Start(new ProcessStartInfo
+            {
+                FileName = currentPath,
+                UseShellExecute = true
+            });
+            Environment.Exit(0);
+        }
+        catch (Exception ex)
+        {
+            // 回滚
+            Console.Error.WriteLine($"Launcher 更新失败: {ex.Message}");
+        }
+    }
+}
+```
+
+#### 10. 主程序支持更新 Launcher
+
+**新建文件**: `LanMountainDesktop/Services/Update/LauncherUpdateService.cs`
+
+```csharp
+namespace LanMountainDesktop.Services.Update;
+
+public class LauncherUpdateService
+{
+    private readonly HttpClient _httpClient;
+    
+    public LauncherUpdateService()
+    {
+        _httpClient = new HttpClient();
+    }
+    
+    public async Task<bool> UpdateLauncherAsync(string downloadUrl)
+    {
+        var rootDir = LaunchContext.PackageRoot 
+            ?? Path.GetDirectoryName(Environment.ProcessPath)!;
+        var updatePath = Path.Combine(rootDir, "LanMountainDesktop.Launcher.Update.exe");
+        
+        // 下载新版本
+        var response = await _httpClient.GetAsync(downloadUrl);
+        await using var fs = File.Create(updatePath);
+        await response.Content.CopyToAsync(fs);
+        
+        return true;
+    }
+    
+    public void RestartWithNewLauncher()
+    {
+        var launcherPath = Path.Combine(
+            LaunchContext.PackageRoot ?? "",
+            "LanMountainDesktop.exe");
+            
+        Process.Start(new ProcessStartInfo
+        {
+            FileName = launcherPath,
+            UseShellExecute = true
+        });
+        
+        // 退出主程序，让 Launcher 接管
+        Environment.Exit(0);
+    }
+}
+```
+
+---
+
+### P3: 清理旧代码
+
+#### 11. 删除文件清单
+
+**删除以下文件/目录**:
+
+```
+LanMountainDesktop.Launcher/
+├── App.axaml                          ← 删除
+├── App.axaml.cs                       ← 删除
+├── Views/                             ← 删除整个目录
+│   ├── OobeWindow.axaml
+│   ├── OobeWindow.axaml.cs
+│   ├── SplashWindow.axaml
+│   └── SplashWindow.axaml.cs
+├── Services/                          ← 删除大部分
+│   ├── LauncherFlowCoordinator.cs     ← 删除
+│   ├── OobeStateService.cs            ← 删除
+│   ├── UpdateCheckService.cs          ← 删除
+│   ├── UpdateEngineService.cs         ← 删除
+│   ├── PluginInstallerService.cs      ← 删除
+│   └── PluginUpgradeQueueService.cs   ← 删除
+└── Models/                            ← 删除（如不再需要）
+```
+
+---
+
+### P4: GitHub Actions 工作流修改
+
+#### 12. 修改 release.yml
+
+**关键修改点**:
+
+1. **Launcher 单独编译**:
+```yaml
+- name: Publish Launcher
+  run: |
+    dotnet publish LanMountainDesktop.Launcher/LanMountainDesktop.Launcher.csproj `
+      -c Release `
+      -o ./publish/launcher-win-x64 `
+      --self-contained `
+      -r win-x64 `
+      -p:PublishSingleFile=false `
+      -p:PublishTrimmed=false `
+      -p:DebugType=none
+```
+
+2. **目录结构调整**:
+```yaml
+- name: Restructure for Launcher
+  run: |
+    $version = "${{ needs.prepare.outputs.version }}"
+    $publishDir = "publish/windows-x64"
+    $launcherDir = "publish/launcher-win-x64"
+    $appDir = "app-$version"
+    
+    # 创建新结构
+    $newStructure = "publish-launcher/windows-x64"
+    New-Item -ItemType Directory -Path $newStructure -Force
+    
+    # 移动主程序到 app-{version}/
+    $appPath = Join-Path $newStructure $appDir
+    Move-Item -Path $publishDir -Destination $appPath -Force
+    
+    # 复制 Launcher 到根目录
+    Copy-Item -Path "$launcherDir\*" -Destination $newStructure -Recurse -Force
+    
+    # 创建 .current 标记
+    New-Item -ItemType File -Path (Join-Path $appPath ".current") -Force
+```
+
+3. **Linux/macOS 同样调整**:
+- Linux: 修改 DEB 打包流程
+- macOS: 修改 DMG 打包流程
+
+#### 13. 修改 build.yml
+
+**修改**: 移除 Launcher 相关构建步骤，因为 Launcher 现在完全独立
+
+---
+
+### P5: 图标资源处理
+
+#### 14. Launcher 图标配置
+
+**方案**: 使用链接方式引用主程序图标
+
+**文件**: `LanMountainDesktop.Launcher/LanMountainDesktop.Launcher.csproj`
+
+```xml
+<ItemGroup>
+  <!-- 链接主程序的图标 -->
+  <Content Include="..\LanMountainDesktop\Assets\logo_nightly.ico" Link="Assets\logo_nightly.ico">
+    <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
+  </Content>
+</ItemGroup>
+```
+
+#### 15. 安装程序配置
+
+**文件**: `LanMountainDesktop/installer/LanMountainDesktop.iss` (Inno Setup)
+
+**关键配置**:
+
+```ini
+[Setup]
+AppName=阑山桌面
+AppVersion={#MyAppVersion}
+DefaultDirName={autopf}\LanMountainDesktop
+OutputBaseFilename=LanMountainDesktop-Setup-{#MyAppVersion}-x64
+SetupIconFile=..\Assets\logo_nightly.ico
+UninstallDisplayIcon={app}\LanMountainDesktop.exe
+
+[Files]
+; Launcher
+Source: "..\..\publish\windows-x64\LanMountainDesktop.exe"; DestDir: "{app}"; Flags: ignoreversion
+; 主程序版本目录
+Source: "..\..\publish\windows-x64\app-{#MyAppVersion}\*"; DestDir: "{app}\app-{#MyAppVersion}"; Flags: ignoreversion recursesubdirs
+
+[Icons]
+; 桌面快捷方式
+Name: "{autodesktop}\阑山桌面"; Filename: "{app}\LanMountainDesktop.exe"; IconFilename: "{app}\LanMountainDesktop.exe"
+; 开始菜单
+Name: "{group}\阑山桌面"; Filename: "{app}\LanMountainDesktop.exe"; IconFilename: "{app}\LanMountainDesktop.exe"
+```
+
+---
+
+## 文件变更清单
+
+### 修改文件
+
+1. `LanMountainDesktop.Launcher/Program.cs` - 完全重写
+2. `LanMountainDesktop.Launcher/LanMountainDesktop.Launcher.csproj` - 简化依赖
+3. `LanMountainDesktop/LanMountainDesktop.csproj` - 移除 Launcher 引用
+4. `LanMountainDesktop/Program.cs` - 添加 LaunchContext
+5. `LanMountainDesktop/App.axaml.cs` - 添加 OOBE/Splash/更新入口
+6. `.github/workflows/release.yml` - 调整打包流程
+7. `.github/workflows/build.yml` - 适配新构建流程
+
+### 新增文件
+
+1. `LanMountainDesktop/Services/Oobe/OobeService.cs`
+2. `LanMountainDesktop/Views/Oobe/OobeWindow.axaml`
+3. `LanMountainDesktop/Views/Oobe/OobeWindow.axaml.cs`
+4. `LanMountainDesktop/Views/Splash/SplashWindow.axaml`
+5. `LanMountainDesktop/Views/Splash/SplashWindow.axaml.cs`
+6. `LanMountainDesktop/Services/Update/UpdateService.cs`
+7. `LanMountainDesktop/Services/Update/LauncherUpdateService.cs`
+8. `LanMountainDesktop/Services/Plugins/PluginUpdateService.cs`
+
+### 删除文件
+
+1. `LanMountainDesktop.Launcher/App.axaml`
+2. `LanMountainDesktop.Launcher/App.axaml.cs`
+3. `LanMountainDesktop.Launcher/Views/` 目录
+4. `LanMountainDesktop.Launcher/Services/LauncherFlowCoordinator.cs`
+5. `LanMountainDesktop.Launcher/Services/OobeStateService.cs`
+6. `LanMountainDesktop.Launcher/Services/UpdateCheckService.cs`
+7. `LanMountainDesktop.Launcher/Services/UpdateEngineService.cs`
+8. `LanMountainDesktop.Launcher/Services/PluginInstallerService.cs`
+9. `LanMountainDesktop.Launcher/Services/PluginUpgradeQueueService.cs`
+
+---
+
+## 风险与回滚方案
+
+### 风险
+
+1. **启动失败**: 新 Launcher 可能有 bug 导致无法启动
+2. **更新中断**: 更新逻辑迁移可能导致更新失败
+3. **图标丢失**: 图标配置错误导致快捷方式无图标
+
+### 回滚方案
+
+1. 保留原 Launcher 代码分支
+2. 准备紧急修复版本
+3. 用户可手动下载完整安装包恢复
+
+---
+
+## 验证清单
+
+- [ ] Launcher 能正常启动主程序
+- [ ] 版本选择逻辑正确
+- [ ] 旧版本清理正常
+- [ ] OOBE 流程正常
+- [ ] Splash 显示正常
+- [ ] 更新检查正常
+- [ ] 插件安装正常
+- [ ] GitHub Actions 打包成功
+- [ ] 安装程序图标正常
+- [ ] 快捷方式图标正常
+
+---
+
+## 实施顺序建议
+
+### 第一阶段（立即实施）
+1. 重写 Launcher Program.cs
+2. 修改 Launcher.csproj
+3. 移除主程序对 Launcher 的引用
+4. 测试基本启动功能
+
+### 第二阶段（功能迁移）
+1. 迁移 OOBE 到主程序
+2. 迁移 Splash 到主程序
+3. 迁移更新逻辑到主程序
+4. 迁移插件管理到主程序
+
+### 第三阶段（CI/CD）
+1. 修改 release.yml
+2. 修改 build.yml
+3. 测试打包流程
+4. 验证安装程序
+
+### 第四阶段（优化）
+1. 实现 Launcher 自更新
+2. 性能优化
+3. 清理旧代码

.trae/documents/launcher_improved_plan_v2.md

@@ -0,0 +1,717 @@
+# LanMountainDesktop Launcher 改进计划 V2
+
+## 核心设计理念
+
+**Launcher 是核心协调器，不是极简启动器**
+
+```
+┌─────────────────────────────────────────────────────────────────────────────┐
+│                           Launcher 职责定位                                   │
+├─────────────────────────────────────────────────────────────────────────────┤
+│                                                                             │
+│  Launcher 负责（启动前 & 退出后）：                                            │
+│  ┌─────────────────────────────────────────────────────────────────────┐   │
+│  │  • OOBE 首次引导                                                      │   │
+│  │  • 启动动画 (Splash)                                                  │   │
+│  │  • 插件安装                                                           │   │
+│  │  • 插件更新                                                           │   │
+│  │  • 应用增量更新安装（不是下载！）                                        │   │
+│  │  • 应用静默更新安装                                                   │   │
+│  └─────────────────────────────────────────────────────────────────────┘   │
+│                                                                             │
+│  主程序负责（运行时）：                                                        │
+│  ┌─────────────────────────────────────────────────────────────────────┐   │
+│  │  • 多线程下载（有完整 Downloader）                                     │   │
+│  │  • 更新渠道切换                                                        │   │
+│  │  • 下载管理                                                           │   │
+│  │  • 与 Launcher 通讯（启动进度）                                         │   │
+│  └─────────────────────────────────────────────────────────────────────┘   │
+│                                                                             │
+│  关键优势：                                                                  │
+│  • Launcher 在应用启动前运行 → 可以安装更新而不担心文件占用                    │
+│  • Launcher 在应用退出后运行 → 可以完成待处理的安装任务                        │
+│  • 主程序专注下载 → 利用完整的多线程下载器提高效率                            │
+│                                                                             │
+└─────────────────────────────────────────────────────────────────────────────┘
+```
+
+## 为什么保留 Avalonia？
+
+```
+┌─────────────────────────────────────────────────────────────────────────────┐
+│                         保留 Avalonia 的理由                                  │
+├─────────────────────────────────────────────────────────────────────────────┤
+│                                                                             │
+│  1. 启动画面 (Splash)                                                        │
+│     ┌─────────────────────────────────────────────────────────────────┐    │
+│     │  • 需要显示启动进度                                                  │    │
+│     │  • 需要显示品牌 Logo                                                 │    │
+│     │  • 需要流畅的动画效果                                                 │    │
+│     │  • 纯 Win32 实现复杂且不易维护                                         │    │
+│     └─────────────────────────────────────────────────────────────────┘    │
+│                                                                             │
+│  2. OOBE 首次引导                                                            │
+│     ┌─────────────────────────────────────────────────────────────────┐    │
+│     │  • 需要多步骤向导界面                                                │    │
+│     │  • 需要丰富的交互控件                                                │    │
+│     │  • 需要与主程序一致的视觉风格                                          │    │
+│     │  • Avalonia 提供完整的 UI 框架                                        │    │
+│     └─────────────────────────────────────────────────────────────────┘    │
+│                                                                             │
+│  3. 与主程序的技术栈一致                                                      │
+│     ┌─────────────────────────────────────────────────────────────────┐    │
+│     │  • 共享主题和资源                                                    │    │
+│     │  • 共享控件和样式                                                    │    │
+│     │  • 便于维护和迭代                                                    │    │
+│     └─────────────────────────────────────────────────────────────────┘    │
+│                                                                             │
+└─────────────────────────────────────────────────────────────────────────────┘
+```
+
+## 改进后的架构设计
+
+### 目录结构（保持不变）
+
+```
+安装根目录/
+├── LanMountainDesktop.exe              ← Launcher（Avalonia 应用）
+├── app-1.0.0/                          ← 版本目录
+│   ├── .current                        ← 当前版本标记
+│   ├── LanMountainDesktop.exe          ← 主程序
+│   └── ... (所有依赖)
+└── .launcher/                          ← Launcher 数据目录
+    ├── update/                         ← 更新缓存
+    │   └── incoming/                   ← 下载的更新包（主程序下载到这里）
+    └── snapshots/                      ← 版本快照
+```
+
+### 核心流程设计
+
+```
+┌─────────────────────────────────────────────────────────────────────────────┐
+│                          启动流程（含通讯机制）                                │
+├─────────────────────────────────────────────────────────────────────────────┤
+│                                                                             │
+│  1. 用户启动 LanMountainDesktop.exe (Launcher)                               │
+│     ↓                                                                       │
+│  2. Launcher 检查是否有待处理的更新安装                                        │
+│     ↓                                                                       │
+│  3. 有更新？──Yes──▶ 显示 Splash "正在安装更新..."                             │
+│     ↓                    ↓                                                  │
+│     No              安装更新（增量/静默）                                       │
+│     ↓                    ↓                                                  │
+│  4. 检查是否首次运行 ──Yes──▶ 显示 OOBE 窗口                                   │
+│     ↓ No                    ↓                                               │
+│  5. 显示 Splash "正在启动..."      完成 OOBE                                  │
+│     ↓                                                                       │
+│  6. 启动主程序进程（带通讯参数）                                                │
+│     ↓                                                                       │
+│  7. Launcher 保持运行，监听主程序进度 ─────── IPC 通讯 ───────▶ 主程序           │
+│     ↓                                                                       │
+│  8. 主程序报告启动进度 ─────── IPC 通讯 ───────▶ Launcher 更新 Splash           │
+│     ↓                                                                       │
+│  9. 主程序完全启动 ──Yes──▶ Launcher 关闭 Splash，进入后台/退出                  │
+│                                                                             │
+└─────────────────────────────────────────────────────────────────────────────┘
+```
+
+### 退出流程
+
+```
+┌─────────────────────────────────────────────────────────────────────────────┐
+│                          退出流程（处理待安装任务）                             │
+├─────────────────────────────────────────────────────────────────────────────┤
+│                                                                             │
+│  1. 主程序准备退出                                                            │
+│     ↓                                                                       │
+│  2. 检查是否有待安装的更新/插件 ──Yes──▶ 重启 Launcher 并传递参数               │
+│     ↓ No                    ↓                                               │
+│  3. 正常退出              Launcher 在应用退出后运行                             │
+│                              ↓                                              │
+│                           安装待处理的任务                                     │
+│                              ↓                                              │
+│                           完成后再次启动主程序                                  │
+│                                                                             │
+└─────────────────────────────────────────────────────────────────────────────┘
+```
+
+## Launcher 与主程序的通讯机制
+
+### IPC 方案选择
+
+```
+┌─────────────────────────────────────────────────────────────────────────────┐
+│                           IPC 通讯方案                                        │
+├─────────────────────────────────────────────────────────────────────────────┤
+│                                                                             │
+│  方案 1: 命令行参数 + 退出码（推荐用于启动阶段）                                │
+│  ┌─────────────────────────────────────────────────────────────────────┐   │
+│  │  Launcher 启动主程序:                                                │   │
+│  │    LanMountainDesktop.exe --launcher-pid 12345 --ipc-port 50000      │   │
+│  │                                                                      │   │
+│  │  主程序通过命名管道/HTTP 与 Launcher 通讯                               │   │
+│  └─────────────────────────────────────────────────────────────────────┘   │
+│                                                                             │
+│  方案 2: 命名管道（推荐用于进度报告）                                           │
+│  ┌─────────────────────────────────────────────────────────────────────┐   │
+│  │  Launcher 创建命名管道: \\.\pipe\LanMountainDesktop_Launcher          │   │
+│  │  主程序连接并发送进度消息                                              │   │
+│  │                                                                      │   │
+│  │  消息格式: JSON                                                       │   │
+│  │    {"stage": "initializing", "progress": 30, "message": "加载设置..."} │   │
+│  └─────────────────────────────────────────────────────────────────────┘   │
+│                                                                             │
+│  方案 3: 共享内存/文件（简单状态同步）                                          │
+│  ┌─────────────────────────────────────────────────────────────────────┐   │
+│  │  Launcher 和主程序读写同一个状态文件                                     │   │
+│  │  .launcher/state/startup_status.json                                  │   │
+│  └─────────────────────────────────────────────────────────────────────┘   │
+│                                                                             │
+└─────────────────────────────────────────────────────────────────────────────┘
+```
+
+### 通讯协议设计
+
+```csharp
+// 共享契约（LanMountainDesktop.Shared.Contracts）
+namespace LanMountainDesktop.Shared.Contracts.Launcher;
+
+public enum StartupStage
+{
+    Initializing,
+    LoadingSettings,
+    LoadingPlugins,
+    InitializingUI,
+    Ready
+}
+
+public record StartupProgressMessage
+{
+    public StartupStage Stage { get; init; }
+    public int ProgressPercent { get; init; }  // 0-100
+    public string? Message { get; init; }
+    public DateTimeOffset Timestamp { get; init; } = DateTimeOffset.UtcNow;
+}
+
+public static class LauncherIpc
+{
+    public const string PipeName = "LanMountainDesktop_Launcher";
+    public const string EnvironmentVariablePrefix = "LMD_";
+}
+```
+
+## 详细实施步骤
+
+### P0: 架构调整（核心）
+
+#### 1. 调整 Launcher 项目引用
+
+**文件**: `LanMountainDesktop.Launcher/LanMountainDesktop.Launcher.csproj`
+
+**修改**:
+- 保留 Avalonia 依赖
+- 移除 PluginSdk 引用（Launcher 不需要）
+- 添加 Shared.Contracts 引用（用于 IPC）
+
+```xml
+<Project Sdk="Microsoft.NET.Sdk">
+  <PropertyGroup>
+    <OutputType>WinExe</OutputType>
+    <TargetFramework>net10.0</TargetFramework>
+    <Nullable>enable</Nullable>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <ApplicationIcon>Assetsogo_nightly.ico</ApplicationIcon>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <!-- 保留 Avalonia -->
+    <PackageReference Include="Avalonia" Version="11.3.12" />
+    <PackageReference Include="Avalonia.Desktop" Version="11.3.12" />
+    <PackageReference Include="Avalonia.Themes.Fluent" Version="11.3.12" />
+    
+    <!-- 只引用 Shared.Contracts（IPC 协议） -->
+    <ProjectReference Include="..\LanMountainDesktop.Shared.Contracts\LanMountainDesktop.Shared.Contracts.csproj" />
+  </ItemGroup>
+  
+  <!-- 图标资源 -->
+  <ItemGroup>
+    <Content Include="..\LanMountainDesktop\Assets\logo_nightly.ico" Link="Assets\logo_nightly.ico">
+      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
+    </Content>
+  </ItemGroup>
+</Project>
+```
+
+#### 2. 移除主程序对 Launcher 的引用
+
+**文件**: `LanMountainDesktop/LanMountainDesktop.csproj`
+
+**修改**: 删除 Launcher 引用
+```xml
+<!-- 删除 -->
+<!-- <ProjectReference Include="..\LanMountainDesktop.Launcher\LanMountainDesktop.Launcher.csproj" ReferenceOutputAssembly="false" /> -->
+```
+
+#### 3. 创建 IPC 通讯契约
+
+**新建文件**: `LanMountainDesktop.Shared.Contracts/Launcher/LauncherIpc.cs`
+
+```csharp
+namespace LanMountainDesktop.Shared.Contracts.Launcher;
+
+public enum StartupStage
+{
+    Initializing,
+    LoadingSettings,
+    LoadingPlugins,
+    InitializingUI,
+    Ready
+}
+
+public record StartupProgressMessage
+{
+    public StartupStage Stage { get; init; }
+    public int ProgressPercent { get; init; }
+    public string? Message { get; init; }
+    public DateTimeOffset Timestamp { get; init; } = DateTimeOffset.UtcNow;
+}
+
+public static class LauncherIpcConstants
+{
+    public const string PipeName = "LanMountainDesktop_Launcher";
+    public const string LauncherPidEnvVar = "LMD_LAUNCHER_PID";
+    public const string PackageRootEnvVar = "LMD_PACKAGE_ROOT";
+    public const string VersionEnvVar = "LMD_VERSION";
+}
+```
+
+### P1: Launcher 端实现
+
+#### 4. 实现 IPC 服务端
+
+**新建文件**: `LanMountainDesktop.Launcher/Services/Ipc/LauncherIpcServer.cs`
+
+```csharp
+using System.IO.Pipes;
+using System.Text.Json;
+using LanMountainDesktop.Shared.Contracts.Launcher;
+
+namespace LanMountainDesktop.Launcher.Services.Ipc;
+
+public class LauncherIpcServer : IDisposable
+{
+    private readonly CancellationTokenSource _cts = new();
+    private NamedPipeServerStream? _pipeServer;
+    private readonly Action<StartupProgressMessage> _onProgress;
+    
+    public LauncherIpcServer(Action<StartupProgressMessage> onProgress)
+    {
+        _onProgress = onProgress;
+    }
+    
+    public async Task StartAsync()
+    {
+        while (!_cts.Token.IsCancellationRequested)
+        {
+            try
+            {
+                _pipeServer = new NamedPipeServerStream(
+                    LauncherIpcConstants.PipeName,
+                    PipeDirection.In,
+                    1,
+                    PipeTransmissionMode.Message);
+                
+                await _pipeServer.WaitForConnectionAsync(_cts.Token);
+                
+                using var reader = new StreamReader(_pipeServer);
+                var json = await reader.ReadToEndAsync(_cts.Token);
+                
+                if (!string.IsNullOrEmpty(json))
+                {
+                    var message = JsonSerializer.Deserialize<StartupProgressMessage>(json);
+                    if (message != null)
+                    {
+                        _onProgress(message);
+                    }
+                }
+                
+                _pipeServer.Disconnect();
+            }
+            catch (OperationCanceledException)
+            {
+                break;
+            }
+            catch (Exception ex)
+            {
+                Console.Error.WriteLine($"IPC error: {ex.Message}");
+            }
+        }
+    }
+    
+    public void Dispose()
+    {
+        _cts.Cancel();
+        _pipeServer?.Dispose();
+        _cts.Dispose();
+    }
+}
+```
+
+#### 5. 修改 Launcher 启动流程
+
+**修改文件**: `LanMountainDesktop.Launcher/Services/LauncherFlowCoordinator.cs`
+
+```csharp
+public async Task<LauncherResult> RunAsync()
+{
+    // 1. 清理旧版本
+    _deploymentLocator.CleanupDestroyedDeployments();
+    
+    // 2. 检查并安装待处理的更新（主程序下载的）
+    var pendingUpdate = _updateEngine.CheckPendingUpdate();
+    if (pendingUpdate.HasUpdate)
+    {
+        _splashWindow?.UpdateStatus("正在安装更新...");
+        var updateResult = await _updateEngine.ApplyPendingUpdateAsync();
+        if (!updateResult.Success)
+        {
+            return updateResult;
+        }
+    }
+    
+    // 3. 检查并安装待处理的插件更新
+    var pendingPlugins = _pluginUpgradeQueueService.CheckPendingUpgrades();
+    if (pendingPlugins.HasUpgrades)
+    {
+        _splashWindow?.UpdateStatus("正在更新插件...");
+        var pluginResult = _pluginUpgradeQueueService.ApplyPendingUpgrades();
+        if (!pluginResult.Success)
+        {
+            return pluginResult;
+        }
+    }
+    
+    // 4. OOBE
+    if (_oobeStateService.IsFirstRun())
+    {
+        _splashWindow?.Hide();
+        foreach (var step in _oobeSteps)
+        {
+            await step.RunAsync(CancellationToken.None);
+        }
+        _splashWindow?.Show();
+    }
+    
+    // 5. 启动 IPC 服务端监听主程序进度
+    using var ipcServer = new LauncherIpcServer(msg =>
+    {
+        _splashWindow?.UpdateProgress(msg.ProgressPercent, msg.Message);
+    });
+    _ = ipcServer.StartAsync();
+    
+    // 6. 启动主程序
+    _splashWindow?.UpdateStatus("正在启动...");
+    var hostResult = LaunchHostWithIpc();
+    if (!hostResult.Success)
+    {
+        return hostResult;
+    }
+    
+    // 7. 等待主程序报告就绪或超时
+    await WaitForHostReadyOrTimeoutAsync(TimeSpan.FromSeconds(30));
+    
+    return new LauncherResult { Success = true };
+}
+```
+
+### P2: 主程序端实现
+
+#### 6. 实现 IPC 客户端
+
+**新建文件**: `LanMountainDesktop/Services/Launcher/LauncherIpcClient.cs`
+
+```csharp
+using System.IO.Pipes;
+using System.Text.Json;
+using LanMountainDesktop.Shared.Contracts.Launcher;
+
+namespace LanMountainDesktop.Services.Launcher;
+
+public class LauncherIpcClient : IDisposable
+{
+    private NamedPipeClientStream? _pipeClient;
+    
+    public async Task ConnectAsync(CancellationToken cancellationToken = default)
+    {
+        _pipeClient = new NamedPipeClientStream(
+            ".",
+            LauncherIpcConstants.PipeName,
+            PipeDirection.Out);
+        
+        await _pipeClient.ConnectAsync(5000, cancellationToken);
+    }
+    
+    public async Task ReportProgressAsync(StartupProgressMessage message)
+    {
+        if (_pipeClient?.IsConnected != true)
+            return;
+        
+        var json = JsonSerializer.Serialize(message);
+        using var writer = new StreamWriter(_pipeClient, leaveOpen: true);
+        await writer.WriteAsync(json);
+        await writer.FlushAsync();
+    }
+    
+    public void Dispose()
+    {
+        _pipeClient?.Dispose();
+    }
+}
+```
+
+#### 7. 主程序启动时报告进度
+
+**修改文件**: `LanMountainDesktop/App.axaml.cs`
+
+```csharp
+public override async void OnFrameworkInitializationCompleted()
+{
+    // 检查是否从 Launcher 启动
+    var launcherPid = Environment.GetEnvironmentVariable(LauncherIpcConstants.LauncherPidEnvVar);
+    if (!string.IsNullOrEmpty(launcherPid))
+    {
+        // 连接到 Launcher 的 IPC 服务端
+        _launcherIpc = new LauncherIpcClient();
+        await _launcherIpc.ConnectAsync();
+        
+        // 报告启动进度
+        await _launcherIpc.ReportProgressAsync(new StartupProgressMessage
+        {
+            Stage = StartupStage.Initializing,
+            ProgressPercent = 10,
+            Message = "正在初始化..."
+        });
+    }
+    
+    // 初始化设置
+    await _launcherIpc?.ReportProgressAsync(new StartupProgressMessage
+    {
+        Stage = StartupStage.LoadingSettings,
+        ProgressPercent = 30,
+        Message = "正在加载设置..."
+    });
+    InitializeSettings();
+    
+    // 加载插件
+    await _launcherIpc?.ReportProgressAsync(new StartupProgressMessage
+    {
+        Stage = StartupStage.LoadingPlugins,
+        ProgressPercent = 50,
+        Message = "正在加载插件..."
+    });
+    await InitializePluginsAsync();
+    
+    // 初始化 UI
+    await _launcherIpc?.ReportProgressAsync(new StartupProgressMessage
+    {
+        Stage = StartupStage.InitializingUI,
+        ProgressPercent = 80,
+        Message = "正在初始化界面..."
+    });
+    InitializeUI();
+    
+    // 就绪
+    await _launcherIpc?.ReportProgressAsync(new StartupProgressMessage
+    {
+        Stage = StartupStage.Ready,
+        ProgressPercent = 100,
+        Message = "就绪"
+    });
+    
+    base.OnFrameworkInitializationCompleted();
+}
+```
+
+### P3: 更新流程整合
+
+#### 8. 主程序下载更新
+
+**主程序职责**:
+```csharp
+// 主程序中的更新服务
+public class AppUpdateService
+{
+    public async Task DownloadUpdateAsync(string version, string downloadUrl)
+    {
+        // 使用多线程下载器下载更新包
+        var downloader = new MultiThreadedDownloader();
+        var targetPath = Path.Combine(
+            Environment.GetFolderPath(Environment.SpecialFolder.LocalApplicationData),
+            "LanMountainDesktop",
+            ".launcher",
+            "update",
+            "incoming",
+            $"update-{version}.zip");
+        
+        await downloader.DownloadAsync(downloadUrl, targetPath);
+        
+        // 标记为待安装
+        File.WriteAllText(
+            Path.Combine(Path.GetDirectoryName(targetPath)!, ".pending"),
+            version);
+    }
+}
+```
+
+#### 9. Launcher 安装更新
+
+**Launcher 职责**:
+```csharp
+// Launcher 中的更新安装服务
+public class UpdateInstallationService
+{
+    public async Task<InstallResult> InstallPendingUpdateAsync()
+    {
+        var pendingPath = Path.Combine(
+            _appRoot,
+            ".launcher",
+            "update",
+            "incoming",
+            ".pending");
+        
+        if (!File.Exists(pendingPath))
+            return InstallResult.NoUpdate;
+        
+        var version = File.ReadAllText(pendingPath);
+        var updatePackagePath = Path.Combine(
+            Path.GetDirectoryName(pendingPath)!,
+            $"update-{version}.zip");
+        
+        // 创建新版本目录
+        var newVersionDir = Path.Combine(_appRoot, $"app-{version}");
+        Directory.CreateDirectory(newVersionDir);
+        File.WriteAllText(Path.Combine(newVersionDir, ".partial"), "");
+        
+        // 解压更新包
+        ZipFile.ExtractToDirectory(updatePackagePath, newVersionDir);
+        
+        // 验证文件完整性
+        // ...
+        
+        // 切换版本标记
+        var currentDir = _deploymentLocator.FindCurrentDeploymentDirectory();
+        if (currentDir != null)
+        {
+            File.Delete(Path.Combine(currentDir, ".current"));
+            File.WriteAllText(Path.Combine(currentDir, ".destroy"), "");
+        }
+        
+        File.WriteAllText(Path.Combine(newVersionDir, ".current"), "");
+        File.Delete(Path.Combine(newVersionDir, ".partial"));
+        
+        // 清理待安装标记
+        File.Delete(pendingPath);
+        File.Delete(updatePackagePath);
+        
+        return InstallResult.Success;
+    }
+}
+```
+
+### P4: GitHub Actions 工作流
+
+#### 10. 修改 release.yml
+
+**关键修改点**:
+
+```yaml
+# 1. Launcher 单独编译（保留 Avalonia）
+- name: Publish Launcher
+  run: |
+    dotnet publish LanMountainDesktop.Launcher/LanMountainDesktop.Launcher.csproj `
+      -c Release `
+      -o ./publish/launcher-win-x64 `
+      --self-contained `
+      -r win-x64 `
+      -p:PublishSingleFile=false `
+      -p:DebugType=none
+
+# 2. 目录结构调整
+- name: Restructure for Launcher
+  run: |
+    $version = "${{ needs.prepare.outputs.version }}"
+    $publishDir = "publish/windows-x64"
+    $launcherDir = "publish/launcher-win-x64"
+    $appDir = "app-$version"
+    
+    # 创建新结构
+    $newStructure = "publish-launcher/windows-x64"
+    New-Item -ItemType Directory -Path $newStructure -Force
+    
+    # 移动主程序到 app-{version}/
+    $appPath = Join-Path $newStructure $appDir
+    Move-Item -Path $publishDir -Destination $appPath -Force
+    
+    # 复制 Launcher 到根目录
+    Copy-Item -Path "$launcherDir\*" -Destination $newStructure -Recurse -Force
+    
+    # 创建 .current 标记
+    New-Item -ItemType File -Path (Join-Path $appPath ".current") -Force
+```
+
+## 文件变更清单
+
+### 修改文件
+
+1. `LanMountainDesktop.Launcher/LanMountainDesktop.Launcher.csproj` - 调整引用
+2. `LanMountainDesktop/LanMountainDesktop.csproj` - 移除 Launcher 引用
+3. `LanMountainDesktop.Launcher/Services/LauncherFlowCoordinator.cs` - 添加 IPC 和更新安装
+4. `LanMountainDesktop/App.axaml.cs` - 添加 IPC 客户端和进度报告
+5. `.github/workflows/release.yml` - 调整打包流程
+
+### 新增文件
+
+1. `LanMountainDesktop.Shared.Contracts/Launcher/LauncherIpc.cs` - IPC 契约
+2. `LanMountainDesktop.Launcher/Services/Ipc/LauncherIpcServer.cs` - IPC 服务端
+3. `LanMountainDesktop/Services/Launcher/LauncherIpcClient.cs` - IPC 客户端
+4. `LanMountainDesktop.Launcher/Services/Update/UpdateInstallationService.cs` - 更新安装
+
+### 删除文件
+
+1. 主程序对 Launcher 的项目引用（已存在）
+
+## 实施顺序
+
+### 第一阶段：基础架构
+1. 创建 IPC 契约（Shared.Contracts）
+2. 调整 Launcher 项目引用
+3. 移除主程序对 Launcher 的引用
+4. 测试基本启动
+
+### 第二阶段：IPC 实现
+1. 实现 Launcher IPC 服务端
+2. 实现主程序 IPC 客户端
+3. 测试进度报告
+
+### 第三阶段：更新流程
+1. 主程序实现下载功能
+2. Launcher 实现安装功能
+3. 测试完整更新流程
+
+### 第四阶段：CI/CD
+1. 修改 GitHub Actions
+2. 测试打包流程
+3. 验证安装程序
+
+## 验证清单
+
+- [ ] Launcher 能正常启动主程序
+- [ ] Launcher 显示 Splash 并接收进度更新
+- [ ] 主程序能向 Launcher 报告启动进度
+- [ ] 主程序能下载更新
+- [ ] Launcher 能安装待处理的更新
+- [ ] OOBE 流程正常
+- [ ] 插件更新流程正常
+- [ ] GitHub Actions 打包成功
+- [ ] 安装程序图标正常
+- [ ] 快捷方式图标正常

.trae/specs/launcher-upgrade/checklist.md

@@ -0,0 +1,8 @@
+# Launcher Upgrade Checklist
+
+- [x] Build passes for `LanMountainDesktop.Launcher`.
+- [x] `update check` command returns structured JSON result.
+- [x] `plugin update` command returns structured JSON result.
+- [x] Legacy plugin install arguments still execute.
+- [x] OOBE and splash are implemented as separate windows.
+- [x] Update and rollback logic use version directory markers.

.trae/specs/launcher-upgrade/spec.md

@@ -0,0 +1,54 @@
+# Launcher Upgrade Spec
+
+## Goal
+
+Upgrade `LanMountainDesktop.Launcher` into the unified Launcher for:
+
+- OOBE first-run entry
+- startup splash window
+- silent/incremental/rollback update
+- plugin install/update
+
+## Scope (Phase 1)
+
+- Avalonia GUI launcher with two windows:
+  - `OOBEWindow` (first run only)
+  - `SplashWindow` (every launch)
+- Default command `launch`
+- CLI commands:
+  - `update check|download|apply|rollback`
+  - `plugin install|update`
+- Legacy compatibility:
+  - `--source --plugins-dir --result` still works for plugin install
+
+## Update Behavior
+
+- ClassIsland-style deployment folders:
+  - `app-<version>-<number>/`
+  - marker files `.current`, `.partial`, `.destroy`
+- Signed file map:
+  - `files.json`
+  - `files.json.sig`
+  - `public-key.pem`
+- Incremental update:
+  - `replace` from archive
+  - `reuse` from current deployment
+  - `delete` skip file in target deployment
+- Rollback:
+  - snapshot metadata is written before apply
+  - automatic rollback on apply failure
+  - manual rollback via command
+
+## OOBE and Splash
+
+- OOBE is independent from splash.
+- OOBE shows only:
+  - welcome text: `欢迎使用阑山桌面`
+  - arrow button for continue
+- Splash shows only:
+  - app name: `阑山桌面`
+
+## Extensibility
+
+- `IOobeStep` for future multi-step OOBE
+- `ISplashStageReporter` for future startup progress visualization

.trae/specs/launcher-upgrade/tasks.md

@@ -0,0 +1,12 @@
+# Launcher Upgrade Tasks
+
+- [x] Convert `LanMountainDesktop.Launcher` to Avalonia launcher entry.
+- [x] Add OOBE window with first-run marker handling.
+- [x] Add splash window for every startup.
+- [x] Implement unified command parsing with default `launch`.
+- [x] Keep legacy plugin install args compatibility.
+- [x] Add plugin pending upgrade queue processing.
+- [x] Implement incremental update apply with signed file map.
+- [x] Implement snapshot-based rollback and manual rollback command.
+- [x] Add update check/download/apply/rollback CLI commands.
+- [x] Add launcher spec files under `.trae/specs/launcher-upgrade/`.

.trae/specs/pdc-incremental-migration/checklist.md

@@ -0,0 +1,10 @@
+# Checklist
+
+- [x] `release.yml` produces signed FileMap incremental assets for Windows x64/x86 and Linux x64.
+- [x] `release.yml` no longer depends on `vpk`/VeloPack packaging.
+- [x] Launcher update engine applies only signed FileMap payload path.
+- [x] Host update workflow no longer expects `releases.win.json`/`*.nupkg`.
+- [x] Update source setting includes `pdc` and preserves GitHub fallback behavior.
+- [ ] CI run attached proving all release matrix jobs pass.
+- [ ] N-1 -> N incremental update verified on Windows x64/x86 and Linux x64.
+- [ ] Rollback verification report attached.

.trae/specs/pdc-incremental-migration/spec.md

@@ -0,0 +1,30 @@
+# PDC Incremental Update Migration
+
+## Goal
+
+Replace VeloPack-based incremental packaging with a unified signed FileMap pipeline and prepare for PDC/S3 distribution compatibility, while keeping Launcher installation, rollback, and update orchestration ownership unchanged.
+
+## Stage 1 (Completed in this round)
+
+- Release workflow outputs signed FileMap incremental assets as the primary path:
+  - `files-windows-x64.json` / `.sig` / `update-windows-x64.zip`
+  - `files-windows-x86.json` / `.sig` / `update-windows-x86.zip`
+  - `files-linux-x64.json` / `.sig` / `update-linux-x64.zip`
+- Launcher and host update runtime remove VeloPack branches and return to signed FileMap apply path.
+- Host update asset discovery supports platform-scoped names with fallback to legacy generic names.
+- Optional S3 sync publishes incremental assets in parallel with GitHub Release assets.
+
+## Stage 2 (In Progress)
+
+- Introduce PDC-compatible update source (`pdc`) with fallback to GitHub.
+- Add PDC metadata/latest/distribution API consumption abstraction.
+- Keep Launcher install/apply/rollback state machine unchanged.
+- Prepare `phainon.yml`-compatible release metadata for future PDCC integration.
+
+## Acceptance
+
+- `release.yml` no longer contains VeloPack packaging steps.
+- Windows x64/x86 and Linux x64 release jobs all upload signed FileMap incremental assets.
+- Host auto-update can detect and download platform-matching signed FileMap assets.
+- Launcher `update apply` succeeds with signed FileMap payload and rollback behavior remains unchanged.
+- Optional S3 upload step works when S3 secrets/vars are configured.

.trae/specs/pdc-incremental-migration/tasks.md

@@ -0,0 +1,12 @@
+# Tasks
+
+- [x] Remove VeloPack packaging from release workflow.
+- [x] Promote signed FileMap generation to release primary path.
+- [x] Output platform-scoped incremental assets for Windows x64/x86 and Linux x64.
+- [x] Remove launcher/runtime VeloPack branches.
+- [x] Update host asset discovery to platform-scoped signed FileMap naming.
+- [x] Add optional S3 sync for incremental assets.
+- [x] Extend update source values with `pdc`.
+- [x] Add PDC check fallback service skeleton in settings domain.
+- [ ] Add full PDC FileMap object-hash download/deploy path.
+- [ ] Add PDCC publish integration and `phainon.yml` CI publishing flow.

.trae/specs/velopack-update-integration/checklist.md

@@ -0,0 +1,5 @@
+# Checklist (Deprecated)
+
+- [x] Spec marked as deprecated.
+- [x] Active implementation ownership moved to `pdc-incremental-migration`.
+- [x] No release workflow dependency remains on VeloPack.

.trae/specs/velopack-update-integration/spec.md

@@ -0,0 +1,15 @@
+# VeloPack Update Integration (Deprecated)
+
+## Status
+
+This spec is deprecated and superseded by `.trae/specs/pdc-incremental-migration/`.
+
+## Deprecation Reason
+
+- VeloPack native package generation introduced unstable release blocking (version format coupling and platform divergence).
+- The project has switched back to signed FileMap incremental assets as the primary update path.
+- Launcher remains the update installer/rollback authority; packaging and distribution are being migrated to PDC/S3-compatible flows.
+
+## Migration Note
+
+Use `.trae/specs/pdc-incremental-migration/spec.md` as the active authority for incremental update implementation and acceptance.

.trae/specs/velopack-update-integration/tasks.md

@@ -0,0 +1,6 @@
+# Tasks (Deprecated)
+
+- [x] Mark VeloPack integration spec as deprecated.
+- [x] Remove VeloPack runtime branches from launcher/host update path.
+- [x] Remove VeloPack release workflow packaging steps.
+- [ ] Keep archive for historical context only (no new implementation tasks here).

CHANGELOG.md

@@ -1,5 +1,30 @@
 # 更新日志 / Changelog
 
+## [0.8.4](https://github.com/yourorg/LanMountainDesktop/releases/tag/v0.8.4) - 2026-04-12
+
+### 新增 (Added)
+
+- ✨ **全新淡入淡出动画系统**: 引入了一套全新的淡入淡出动画效果
+  - 提升界面切换和元素显示的视觉流畅度
+  - 为用户带来更加自然优雅的交互体验
+
+### 变更 (Changed)
+
+- ♻️ **SDK 更新**: 更新插件 SDK，优化插件开发接口和兼容性
+- 🎨 **网速显示组件优化**: 优化了网速显示组件的显示效果
+  - 改进数据展示方式，提升可读性
+  - 优化视觉样式，与整体设计语言更加协调
+
+### 修复 (Fixed)
+
+- 无
+
+### 移除 (Removed)
+
+- 无
+
+***
+
 ## [0.8.3.5](https://github.com/yourorg/LanMountainDesktop/releases/tag/v0.8.3.5) - 2026-04-12
 
 ### 新增 (Added)

Directory.Build.props

@@ -4,5 +4,6 @@
     <TargetFramework Condition="'$(TargetFramework)' == ''">net10.0</TargetFramework>
     <Nullable Condition="'$(Nullable)' == ''">enable</Nullable>
     <ImplicitUsings Condition="'$(ImplicitUsings)' == ''">enable</ImplicitUsings>
+    <ServerGarbageCollection>true</ServerGarbageCollection>
   </PropertyGroup>
 </Project>

LanMountainDesktop.Launcher/App.axaml

@@ -0,0 +1,9 @@
+<Application xmlns="https://github.com/avaloniaui"
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             xmlns:sty="using:FluentAvalonia.Styling"
+             x:Class="LanMountainDesktop.Launcher.App"
+             RequestedThemeVariant="Default">
+  <Application.Styles>
+    <sty:FluentAvaloniaTheme />
+  </Application.Styles>
+</Application>

LanMountainDesktop.Launcher/App.axaml.cs

@@ -0,0 +1,392 @@
+using Avalonia;
+using Avalonia.Controls;
+using Avalonia.Controls.ApplicationLifetimes;
+using Avalonia.Markup.Xaml;
+using Avalonia.Threading;
+using LanMountainDesktop.Launcher.Models;
+using LanMountainDesktop.Launcher.Services;
+using LanMountainDesktop.Launcher.Views;
+
+namespace LanMountainDesktop.Launcher;
+
+public partial class App : Application
+{
+    public override void Initialize()
+    {
+        // 初始化日志记录器
+        Logger.Initialize();
+        Logger.Info("Launcher starting...");
+        
+        AvaloniaXamlLoader.Load(this);
+    }
+
+    public override void OnFrameworkInitializationCompleted()
+    {
+        if (ApplicationLifetime is IClassicDesktopStyleApplicationLifetime desktop)
+        {
+            var context = LauncherRuntimeContext.Current;
+
+            // 调试模式：显示开发调试窗口
+            if (context.IsDebugMode)
+            {
+                var devDebugWindow = new DevDebugWindow();
+                devDebugWindow.Show();
+                
+                // 调试模式下不自动启动正常流程，由开发者通过调试窗口控制
+                base.OnFrameworkInitializationCompleted();
+                return;
+            }
+
+            // 处理各界面的预览命令
+            if (HandlePreviewCommand(context, desktop))
+            {
+                base.OnFrameworkInitializationCompleted();
+                return;
+            }
+
+            // apply-update 模式：显示 UpdateWindow，执行增量更新 + 插件升级
+            if (string.Equals(context.Command, "apply-update", StringComparison.OrdinalIgnoreCase))
+            {
+                // 先显示窗口，再启动后台任务
+                var updateWindow = new UpdateWindow();
+                updateWindow.Show();
+                _ = RunApplyUpdateWithWindowAsync(desktop, context, updateWindow);
+            }
+            else
+            {
+                // 先显示 Splash 窗口，确保应用程序不会立即退出
+                var splashWindow = new SplashWindow();
+                splashWindow.Show();
+                
+                // 在 try-catch 块中实例化所有服务，确保任何异常都能被捕获
+                _ = RunCoordinatorWithSplashAsync(desktop, context, splashWindow);
+            }
+        }
+
+        base.OnFrameworkInitializationCompleted();
+    }
+
+    /// <summary>
+    /// 处理界面预览命令
+    /// </summary>
+    private bool HandlePreviewCommand(CommandContext context, IClassicDesktopStyleApplicationLifetime desktop)
+    {
+        var command = context.Command.ToLowerInvariant();
+        
+        switch (command)
+        {
+            case "preview-splash":
+                Console.WriteLine("[Launcher] Preview mode: SplashWindow");
+                var splashWindow = new SplashWindow();
+                splashWindow.SetDebugMode(true);
+                splashWindow.Show();
+                _ = SimulateSplashPreviewAsync(desktop, splashWindow);
+                return true;
+                
+            case "preview-error":
+                Console.WriteLine("[Launcher] Preview mode: ErrorWindow");
+                var errorWindow = new ErrorWindow();
+                errorWindow.SetErrorMessage("[预览模式] 这是一个错误页面预览。\n\n用于查看错误页面的样式和布局。");
+                errorWindow.Show();
+                _ = WaitForWindowCloseAsync(desktop, errorWindow);
+                return true;
+                
+            case "preview-update":
+                Console.WriteLine("[Launcher] Preview mode: UpdateWindow");
+                var updateWindow = new UpdateWindow();
+                updateWindow.SetDebugMode(true);
+                updateWindow.Show();
+                _ = SimulateUpdatePreviewAsync(desktop, updateWindow);
+                return true;
+                
+            case "preview-oobe":
+                Console.WriteLine("[Launcher] Preview mode: OobeWindow");
+                var oobeWindow = new OobeWindow();
+                oobeWindow.Show();
+                _ = SimulateOobePreviewAsync(desktop, oobeWindow);
+                return true;
+                
+            case "preview-debug":
+                Console.WriteLine("[Launcher] Preview mode: DevDebugWindow");
+                var devDebugWindow = new DevDebugWindow();
+                devDebugWindow.Show();
+                return true;
+                
+            default:
+                return false;
+        }
+    }
+
+    /// <summary>
+    /// 模拟 Splash 窗口预览
+    /// </summary>
+    private async Task SimulateSplashPreviewAsync(IClassicDesktopStyleApplicationLifetime desktop, SplashWindow window)
+    {
+        var stages = new[] { "initializing", "update", "plugins", "launch", "ready" };
+        var messages = new[] { "初始化...", "检查更新...", "检查插件...", "正在启动...", "就绪" };
+        var reporter = (ISplashStageReporter)window;
+        
+        for (int i = 0; i < stages.Length; i++)
+        {
+            reporter.Report(stages[i], messages[i]);
+            await Task.Delay(800);
+        }
+        
+        // 等待5秒后自动关闭
+        await Task.Delay(5000);
+        await Dispatcher.UIThread.InvokeAsync(() => desktop.Shutdown(0));
+    }
+
+    /// <summary>
+    /// 模拟 Update 窗口预览
+    /// </summary>
+    private async Task SimulateUpdatePreviewAsync(IClassicDesktopStyleApplicationLifetime desktop, UpdateWindow window)
+    {
+        var stages = new[] { "verify", "extract", "apply", "plugins", "cleanup" };
+        
+        for (int i = 0; i < stages.Length; i++)
+        {
+            window.Report(stages[i], $"正在{GetStageName(stages[i])}...", (i + 1) * 20);
+            await Task.Delay(600);
+        }
+        
+        window.ReportComplete(true, null);
+        
+        // 等待3秒后自动关闭
+        await Task.Delay(3000);
+        await Dispatcher.UIThread.InvokeAsync(() => desktop.Shutdown(0));
+        
+        string GetStageName(string stage) => stage switch
+        {
+            "verify" => "验证",
+            "extract" => "解压",
+            "apply" => "应用",
+            "plugins" => "升级插件",
+            "cleanup" => "清理",
+            _ => stage
+        };
+    }
+
+    /// <summary>
+    /// 模拟 OOBE 窗口预览
+    /// </summary>
+    private async Task SimulateOobePreviewAsync(IClassicDesktopStyleApplicationLifetime desktop, OobeWindow window)
+    {
+        try
+        {
+            // 等待用户点击开始按钮
+            await window.WaitForEnterAsync();
+            Console.WriteLine("[Launcher] OOBE preview completed by user");
+        }
+        catch (Exception ex)
+        {
+            Console.Error.WriteLine($"[Launcher] OOBE preview error: {ex.Message}");
+        }
+        
+        // 用户点击后关闭应用程序
+        await Dispatcher.UIThread.InvokeAsync(() => desktop.Shutdown(0));
+    }
+
+    /// <summary>
+    /// 等待窗口关闭
+    /// </summary>
+    private async Task WaitForWindowCloseAsync(IClassicDesktopStyleApplicationLifetime desktop, Window window)
+    {
+        var tcs = new TaskCompletionSource();
+        window.Closed += (s, e) => tcs.TrySetResult();
+        await tcs.Task;
+        await Dispatcher.UIThread.InvokeAsync(() => desktop.Shutdown(0));
+    }
+    
+    private static async Task RunCoordinatorWithSplashAsync(
+        IClassicDesktopStyleApplicationLifetime desktop,
+        CommandContext context,
+        SplashWindow splashWindow)
+    {
+        LauncherResult result;
+        ErrorWindow? errorWindow = null;
+        LauncherFlowCoordinator? coordinator = null;
+        
+        try
+        {
+            // 在 try-catch 块中实例化所有服务，确保异常被捕获
+            var appRoot = Commands.ResolveAppRoot(context);
+            var deploymentLocator = new DeploymentLocator(appRoot);
+            
+            // TODO: 从配置读取 GitHub 仓库信息
+            var updateCheckService = new UpdateCheckService("ClassIsland", "LanMountainDesktop");
+            
+            coordinator = new LauncherFlowCoordinator(
+                context,
+                deploymentLocator,
+                new OobeStateService(appRoot),
+                new UpdateEngineService(deploymentLocator),
+                updateCheckService,
+                new PluginInstallerService());
+
+            result = await coordinator.RunAsync(splashWindow).ConfigureAwait(false);
+        }
+        catch (Exception ex)
+        {
+            // 捕获异常并显示错误窗口
+            result = new LauncherResult
+            {
+                Success = false,
+                Stage = "launch",
+                Code = "exception",
+                Message = $"启动器发生错误: {ex.Message}",
+                ErrorMessage = ex.ToString()
+            };
+            
+            Console.Error.WriteLine($"[Launcher] Exception caught: {ex}");
+            
+            // 在 UI 线程显示错误窗口 - 使用更健壮的方式
+            try
+            {
+                await Dispatcher.UIThread.InvokeAsync(() =>
+                {
+                    try
+                    {
+                        // 安全关闭 Splash 窗口
+                        if (splashWindow.IsVisible && splashWindow.IsLoaded)
+                        {
+                            splashWindow.Close();
+                        }
+                    }
+                    catch (Exception closeEx)
+                    {
+                        Console.Error.WriteLine($"[Launcher] Error closing splash window: {closeEx.Message}");
+                    }
+                    
+                    // 创建并显示错误窗口
+                    try
+                    {
+                        errorWindow = new ErrorWindow();
+                        errorWindow.SetErrorMessage($"启动器发生错误:\n{ex.Message}\n\n请检查应用安装是否完整，或尝试重新安装。");
+                        errorWindow.Show();
+                        Console.WriteLine("[Launcher] ErrorWindow shown successfully");
+                    }
+                    catch (Exception windowEx)
+                    {
+                        Console.Error.WriteLine($"[Launcher] Failed to show ErrorWindow: {windowEx.Message}");
+                    }
+                });
+                
+                // 如果错误窗口成功显示，等待它关闭
+                if (errorWindow != null)
+                {
+                    try
+                    {
+                        // 等待用户选择或窗口关闭
+                        var errorResult = await errorWindow.WaitForChoiceAsync();
+                        Console.WriteLine($"[Launcher] ErrorWindow result: {errorResult}");
+                    }
+                    catch (Exception waitEx)
+                    {
+                        Console.Error.WriteLine($"[Launcher] Error waiting for ErrorWindow: {waitEx.Message}");
+                        // 如果等待失败，至少给用户5秒时间看到错误信息
+                        await Task.Delay(5000);
+                    }
+                }
+                else
+                {
+                    // 错误窗口未能显示，等待5秒让用户看到控制台输出
+                    await Task.Delay(5000);
+                }
+            }
+            catch (Exception uiEx)
+            {
+                // 最后的兜底：记录到控制台
+                Console.Error.WriteLine($"[Launcher] Critical error in UI thread: {uiEx.Message}");
+                await Task.Delay(3000);
+            }
+        }
+        
+        await Commands.WriteResultIfNeededAsync(LauncherRuntimeContext.Current.GetOption("result"), result).ConfigureAwait(false);
+        Environment.ExitCode = result.Success ? 0 : 1;
+        await Dispatcher.UIThread.InvokeAsync(() => desktop.Shutdown(Environment.ExitCode), DispatcherPriority.Background);
+    }
+
+    /// <summary>
+    /// apply-update 模式：执行增量更新和插件升级，完成后自动退出
+    /// </summary>
+    private static async Task RunApplyUpdateWithWindowAsync(
+        IClassicDesktopStyleApplicationLifetime desktop,
+        CommandContext context,
+        UpdateWindow window)
+    {
+        var appRoot = Commands.ResolveAppRoot(context);
+        var deploymentLocator = new DeploymentLocator(appRoot);
+        var updateEngine = new UpdateEngineService(deploymentLocator);
+        var pluginInstaller = new PluginInstallerService();
+        var pluginUpgrades = new PluginUpgradeQueueService(pluginInstaller);
+
+        var success = true;
+        string? errorMessage = null;
+
+        try
+        {
+            // 1. 应用增量更新
+            await Dispatcher.UIThread.InvokeAsync(() => window.Report("verify", "正在验证更新...", 10));
+            var updateResult = await updateEngine.ApplyPendingUpdateAsync().ConfigureAwait(false);
+            if (!updateResult.Success)
+            {
+                success = false;
+                errorMessage = updateResult.Message;
+            }
+
+            // 2. 应用待处理的插件升级
+            if (success)
+            {
+                await Dispatcher.UIThread.InvokeAsync(() => window.Report("plugins", "正在升级插件...", 60));
+                var pluginsDir = context.GetOption("plugins-dir")
+                                 ?? Path.Combine(appRoot, "plugins");
+                var queueResult = pluginUpgrades.ApplyPendingUpgrades(pluginsDir);
+                if (!queueResult.Success && queueResult.Code != "noop")
+                {
+                    // 插件升级失败不阻断整体流程，仅记录到控制台
+                    Console.Error.WriteLine($"Plugin upgrade had failures: {queueResult.Message}");
+                }
+            }
+
+            // 3. 清理旧版本，保留至少3个版本以支持回滚
+            if (success)
+            {
+                await Dispatcher.UIThread.InvokeAsync(() => window.Report("cleanup", "正在清理...", 90));
+                deploymentLocator.CleanupOldDeployments(minVersionsToKeep: 3);
+            }
+        }
+        catch (Exception ex)
+        {
+            success = false;
+            errorMessage = ex.Message;
+        }
+
+        // 显示完成状态，短暂停留后关闭
+        await Dispatcher.UIThread.InvokeAsync(() => window.ReportComplete(success, errorMessage));
+
+        if (success)
+        {
+            // 成功：停留 1.5 秒让用户看到"更新完成"
+            await Task.Delay(1500);
+        }
+        else
+        {
+            // 失败：停留 5 秒让用户看到错误信息
+            await Task.Delay(5000);
+        }
+
+        await Commands.WriteResultIfNeededAsync(context.GetOption("result"), new LauncherResult
+        {
+            Success = success,
+            Stage = "apply-update",
+            Code = success ? "ok" : "failed",
+            Message = success ? "Update applied successfully." : (errorMessage ?? "Unknown error")
+        }).ConfigureAwait(false);
+
+        Environment.ExitCode = success ? 0 : 1;
+        await Dispatcher.UIThread.InvokeAsync(() => desktop.Shutdown(Environment.ExitCode), DispatcherPriority.Background);
+    }
+
+
+}

LanMountainDesktop.Launcher/AppJsonContext.cs

@@ -0,0 +1,23 @@
+using System.Text.Json;
+using System.Text.Json.Serialization;
+using LanMountainDesktop.Launcher.Models;
+using LanMountainDesktop.Launcher.Services;
+using LanMountainDesktop.Shared.Contracts.Launcher;
+
+namespace LanMountainDesktop.Launcher;
+
+[JsonSourceGenerationOptions(WriteIndented = true, PropertyNamingPolicy = JsonKnownNamingPolicy.CamelCase)]
+[JsonSerializable(typeof(SignedFileMap))]
+[JsonSerializable(typeof(UpdateFileEntry))]
+[JsonSerializable(typeof(SnapshotMetadata))]
+[JsonSerializable(typeof(AppVersionInfo))]
+[JsonSerializable(typeof(StartupProgressMessage))]
+[JsonSerializable(typeof(LauncherResult))]
+[JsonSerializable(typeof(HostDiscoveryConfig))]
+[JsonSerializable(typeof(PluginManifest))]
+[JsonSerializable(typeof(PendingUpgrade))]
+[JsonSerializable(typeof(List<PendingUpgrade>))]
+[JsonSerializable(typeof(GitHubRelease))]
+[JsonSerializable(typeof(GitHubAsset))]
+[JsonSerializable(typeof(List<GitHubRelease>))]
+internal sealed partial class AppJsonContext : JsonSerializerContext;

LanMountainDesktop.Launcher/Assets/public-key.pem

@@ -0,0 +1,11 @@
+-----BEGIN RSA PUBLIC KEY-----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+-----END RSA PUBLIC KEY-----

LanMountainDesktop.Launcher/CommandContext.cs

@@ -0,0 +1,93 @@
+using System.Globalization;
+
+namespace LanMountainDesktop.Launcher;
+
+internal sealed class CommandContext
+{
+    public string Command { get; }
+
+    public string SubCommand { get; }
+
+    public IReadOnlyDictionary<string, string> Options { get; }
+
+    /// <summary>
+    /// 原始命令行参数，用于转发给主程序
+    /// </summary>
+    public IReadOnlyList<string> RawArgs { get; }
+
+    public bool IsLegacyPluginInstall =>
+        Options.ContainsKey("source") &&
+        Options.ContainsKey("plugins-dir") &&
+        Options.ContainsKey("result");
+
+    /// <summary>
+    /// 是否处于调试模式（从 Rider/VS 等 IDE 启动）
+    /// 仅当明确指定 --debug 参数或调试器附加时才启用
+    /// </summary>
+    public bool IsDebugMode =>
+        Options.ContainsKey("debug") ||
+        System.Diagnostics.Debugger.IsAttached;
+
+    private CommandContext(string command, string subCommand, Dictionary<string, string> options, string[] rawArgs)
+    {
+        Command = command;
+        SubCommand = subCommand;
+        Options = options;
+        RawArgs = rawArgs;
+    }
+
+    public static CommandContext FromArgs(string[] args)
+    {
+        var options = ParseOptions(args);
+        var command = args.Length > 0 && !args[0].StartsWith("--", StringComparison.Ordinal)
+            ? args[0]
+            : "launch";
+        var subCommand = args.Length > 1 && !args[1].StartsWith("--", StringComparison.Ordinal)
+            ? args[1]
+            : string.Empty;
+
+        return new CommandContext(command, subCommand, options, args);
+    }
+
+    public string? GetOption(string key)
+    {
+        return Options.TryGetValue(key, out var value) ? value : null;
+    }
+
+    public int GetIntOption(string key, int fallback)
+    {
+        var raw = GetOption(key);
+        return int.TryParse(raw, NumberStyles.Integer, CultureInfo.InvariantCulture, out var value)
+            ? value
+            : fallback;
+    }
+
+    private static Dictionary<string, string> ParseOptions(string[] args)
+    {
+        var values = new Dictionary<string, string>(StringComparer.OrdinalIgnoreCase);
+        for (var i = 0; i < args.Length; i++)
+        {
+            var current = args[i];
+            if (!current.StartsWith("--", StringComparison.Ordinal))
+            {
+                continue;
+            }
+
+            var key = current[2..];
+            if (string.IsNullOrWhiteSpace(key))
+            {
+                continue;
+            }
+
+            if (i + 1 < args.Length && !args[i + 1].StartsWith("--", StringComparison.Ordinal))
+            {
+                values[key] = args[++i];
+                continue;
+            }
+
+            values[key] = "true";
+        }
+
+        return values;
+    }
+}

LanMountainDesktop.Launcher/LanMountainDesktop.Launcher.AOT.props

@@ -0,0 +1,66 @@
+<!-- AOT 发布配置文件 -->
+<Project>
+  <PropertyGroup Condition="'$(PublishAot)' == 'true'">
+    <!-- 启用 Native AOT -->
+    <PublishAot>true</PublishAot>
+    
+    <!-- 启用修剪以减小体积 -->
+    <PublishTrimmed>true</PublishTrimmed>
+    <TrimMode>partial</TrimMode>
+    
+    <!-- 自包含（不依赖系统 .NET Runtime） -->
+    <SelfContained>true</SelfContained>
+    
+    <!-- 单文件发布 -->
+    <PublishSingleFile>true</PublishSingleFile>
+    
+    <!-- 包含 native 库到单文件中 -->
+    <IncludeNativeLibrariesForSelfExtract>true</IncludeNativeLibrariesForSelfExtract>
+    
+    <!-- 压缩单文件 -->
+    <EnableCompressionInSingleFile>true</EnableCompressionInSingleFile>
+    
+    <!-- 优化大小 -->
+    <OptimizationPreference>Size</OptimizationPreference>
+    
+    <!-- 禁用 ReadyToRun（AOT 不需要） -->
+    <PublishReadyToRun>false</PublishReadyToRun>
+    
+    <!-- 注意：RuntimeIdentifier 由 CI/CD 工作流通过 -r 参数传入，不在此处硬编码 -->
+    <!-- 支持的平台：win-x64, win-x86, linux-x64, osx-x64, osx-arm64 -->
+  </PropertyGroup>
+  
+  <!-- AOT 兼容性设置 -->
+  <PropertyGroup>
+    <!-- 允许不安全代码（某些 AOT 场景需要） -->
+    <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
+    
+    <!-- 启用编译时绑定（Avalonia 需要） -->
+    <AvaloniaUseCompiledBindingsByDefault>true</AvaloniaUseCompiledBindingsByDefault>
+  </PropertyGroup>
+  
+  <!-- AOT 修剪配置 -->
+  <ItemGroup Condition="'$(PublishAot)' == 'true'">
+    <!-- 保留 Avalonia 必要的类型 -->
+    <TrimmerRootAssembly Include="Avalonia" />
+    <TrimmerRootAssembly Include="Avalonia.Desktop" />
+    
+    <!-- 保留动态序列化类型 -->
+    <TrimmerRootAssembly Include="System.Text.Json" />
+  </ItemGroup>
+  
+  <!-- AOT 兼容性：某些包可能需要特殊处理 -->
+  <PropertyGroup Condition="'$(PublishAot)' == 'true'">
+    <!-- 忽略某些警告 -->
+    <SuppressTrimAnalysisWarnings>false</SuppressTrimAnalysisWarnings>
+    <!-- 允许 IL 警告 -->
+    <TrimmerSingleWarn>false</TrimmerSingleWarn>
+    
+    <!-- AOT 模式下禁用反射式 JSON 序列化，强制使用 Source Generator -->
+    <!-- 之前设置为 true 与 AOT 矛盾，导致 IL2026/IL3050 警告和运行时失败 -->
+    <JsonSerializerIsReflectionEnabledByDefault>false</JsonSerializerIsReflectionEnabledByDefault>
+    
+    <!-- 启用 ISerializable 支持（部分库需要） -->
+    <IsAotCompatible>true</IsAotCompatible>
+  </PropertyGroup>
+</Project>

LanMountainDesktop.Launcher/LanMountainDesktop.Launcher.SingleFile.props

@@ -0,0 +1,29 @@
+<!-- 单文件发布配置文件（非 AOT，但接近单文件体验） -->
+<Project>
+  <PropertyGroup Condition="'$(PublishSingleFileMode)' == 'true'">
+    <!-- 自包含 -->
+    <SelfContained>true</SelfContained>
+    
+    <!-- 单文件发布 -->
+    <PublishSingleFile>true</PublishSingleFile>
+    
+    <!-- 包含 native 库到单文件中 -->
+    <IncludeNativeLibrariesForSelfExtract>true</IncludeNativeLibrariesForSelfExtract>
+    
+    <!-- 压缩单文件 -->
+    <EnableCompressionInSingleFile>true</EnableCompressionInSingleFile>
+    
+    <!-- ReadyToRun 预编译（提升启动速度） -->
+    <PublishReadyToRun>true</PublishReadyToRun>
+    
+    <!-- 修剪以减小体积 -->
+    <PublishTrimmed>true</PublishTrimmed>
+    <TrimMode>partial</TrimMode>
+    
+    <!-- 优化大小 -->
+    <OptimizationPreference>Size</OptimizationPreference>
+    
+    <!-- 目标运行时 -->
+    <RuntimeIdentifier>win-x64</RuntimeIdentifier>
+  </PropertyGroup>
+</Project>

LanMountainDesktop.Launcher/LanMountainDesktop.Launcher.csproj

@@ -0,0 +1,57 @@
+<Project Sdk="Microsoft.NET.Sdk" TreatAsLocalProperty="Version;PackageVersion;InformationalVersion;AssemblyVersion;FileVersion">
+  
+  <!-- 导入 AOT 配置 -->
+  <Import Project="LanMountainDesktop.Launcher.AOT.props" Condition="Exists('LanMountainDesktop.Launcher.AOT.props')" />
+  
+  <PropertyGroup>
+    <OutputType>WinExe</OutputType>
+    <TargetFramework>net10.0</TargetFramework>
+    <Nullable>enable</Nullable>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Version>1.0.0</Version>
+    <PackageVersion>$(Version)</PackageVersion>
+    <AvaloniaUseCompiledBindingsByDefault>true</AvaloniaUseCompiledBindingsByDefault>
+    <!-- 应用程序图标 -->
+    <ApplicationIcon>Assets\logo.ico</ApplicationIcon>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <!-- 只引用 Shared.Contracts（IPC 协议） -->
+    <ProjectReference Include="..\LanMountainDesktop.Shared.Contracts\LanMountainDesktop.Shared.Contracts.csproj" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Avalonia" Version="11.3.12" />
+    <PackageReference Include="Avalonia.Desktop" Version="11.3.12" />
+    <PackageReference Include="FluentAvaloniaUI" Version="2.5.0" />
+    <PackageReference Include="Avalonia.Fonts.Inter" Version="11.3.12" />
+    <PackageReference Include="Tmds.DBus.Protocol" Version="0.92.0" />
+  </ItemGroup>
+
+  <!-- 资源文件 -->
+  <ItemGroup>
+    <!-- 公钥文件 -->
+    <None Include="Assets\public-key.pem" CopyToOutputDirectory="PreserveNewest" />
+    <!-- Avalonia 资源文件 -->
+    <AvaloniaResource Include="Assets\logo.ico" />
+  </ItemGroup>
+
+  <Target Name="CopyPublicKeyToLauncherDir" AfterTargets="Build">
+    <PropertyGroup>
+      <PublicKeySource>$(MSBuildProjectDirectory)\Assets\public-key.pem</PublicKeySource>
+      <PublicKeyDestDir>$(OutDir).launcher\update</PublicKeyDestDir>
+    </PropertyGroup>
+    <MakeDir Directories="$(PublicKeyDestDir)" />
+    <Copy SourceFiles="$(PublicKeySource)" DestinationFolder="$(PublicKeyDestDir)" SkipUnchangedFiles="true" />
+  </Target>
+
+  <Target Name="CopyPublicKeyToPublishDir" AfterTargets="Publish">
+    <PropertyGroup>
+      <PublishedKeySource>$(MSBuildProjectDirectory)\Assets\public-key.pem</PublishedKeySource>
+      <PublishedKeyDestDir>$(PublishDir).launcher\update</PublishedKeyDestDir>
+    </PropertyGroup>
+    <MakeDir Directories="$(PublishedKeyDestDir)" />
+    <Copy SourceFiles="$(PublishedKeySource)" DestinationFolder="$(PublishedKeyDestDir)" SkipUnchangedFiles="true" />
+  </Target>
+
+</Project>

LanMountainDesktop.Launcher/LauncherRuntimeContext.cs

@@ -0,0 +1,6 @@
+namespace LanMountainDesktop.Launcher;
+
+internal static class LauncherRuntimeContext
+{
+    public static CommandContext Current { get; set; } = CommandContext.FromArgs([]);
+}

LanMountainDesktop.Launcher/Models/LauncherResult.cs

@@ -0,0 +1,42 @@
+using System.Text.Json.Serialization;
+
+namespace LanMountainDesktop.Launcher.Models;
+
+internal sealed class LauncherResult
+{
+    [JsonPropertyName("success")]
+    public bool Success { get; init; }
+
+    [JsonPropertyName("stage")]
+    public string Stage { get; init; } = string.Empty;
+
+    [JsonPropertyName("code")]
+    public string Code { get; init; } = "ok";
+
+    [JsonPropertyName("message")]
+    public string Message { get; init; } = string.Empty;
+
+    [JsonPropertyName("currentVersion")]
+    public string? CurrentVersion { get; init; }
+
+    [JsonPropertyName("targetVersion")]
+    public string? TargetVersion { get; init; }
+
+    [JsonPropertyName("rolledBackTo")]
+    public string? RolledBackTo { get; init; }
+
+    [JsonPropertyName("details")]
+    public Dictionary<string, string> Details { get; init; } = [];
+
+    [JsonPropertyName("installedPackagePath")]
+    public string? InstalledPackagePath { get; init; }
+
+    [JsonPropertyName("manifestId")]
+    public string? ManifestId { get; init; }
+
+    [JsonPropertyName("manifestName")]
+    public string? ManifestName { get; init; }
+
+    [JsonPropertyName("errorMessage")]
+    public string? ErrorMessage { get; init; }
+}

LanMountainDesktop.Launcher/Models/ReleaseInfo.cs

@@ -0,0 +1,24 @@
+namespace LanMountainDesktop.Launcher.Models;
+
+/// <summary>
+/// GitHub Release 信息
+/// </summary>
+public sealed class ReleaseInfo
+{
+    public required string TagName { get; init; }
+    public required string Name { get; init; }
+    public required bool Prerelease { get; init; }
+    public required DateTime PublishedAt { get; init; }
+    public required List<ReleaseAsset> Assets { get; init; }
+    public string? Body { get; init; }
+}
+
+/// <summary>
+/// Release 资源文件
+/// </summary>
+public sealed class ReleaseAsset
+{
+    public required string Name { get; init; }
+    public required string BrowserDownloadUrl { get; init; }
+    public required long Size { get; init; }
+}

LanMountainDesktop.Launcher/Models/UpdateChannel.cs

@@ -0,0 +1,17 @@
+namespace LanMountainDesktop.Launcher.Models;
+
+/// <summary>
+/// 更新频道
+/// </summary>
+public enum UpdateChannel
+{
+    /// <summary>
+    /// 正式版 - 只检查 prerelease=false 的版本
+    /// </summary>
+    Stable,
+
+    /// <summary>
+    /// 预览版 - 检查所有版本(包括 prerelease=true)
+    /// </summary>
+    Preview
+}

LanMountainDesktop.Launcher/Models/UpdateCheckResult.cs

@@ -0,0 +1,13 @@
+namespace LanMountainDesktop.Launcher.Models;
+
+/// <summary>
+/// 更新检查结果
+/// </summary>
+public sealed class UpdateCheckResult
+{
+    public bool HasUpdate { get; init; }
+    public string? LatestVersion { get; init; }
+    public string? CurrentVersion { get; init; }
+    public ReleaseInfo? Release { get; init; }
+    public string? ErrorMessage { get; init; }
+}

LanMountainDesktop.Launcher/Models/UpdateModels.cs

@@ -0,0 +1,55 @@
+namespace LanMountainDesktop.Launcher.Models;
+
+internal sealed class SignedFileMap
+{
+    public string? FromVersion { get; set; }
+
+    public string? ToVersion { get; set; }
+
+    public string? Platform { get; set; }
+
+    public string? Arch { get; set; }
+
+    public List<UpdateFileEntry> Files { get; set; } = [];
+}
+
+internal sealed class UpdateFileEntry
+{
+    public string Path { get; set; } = string.Empty;
+
+    public string? ArchivePath { get; set; }
+
+    public string Action { get; set; } = "replace";
+
+    public string? Sha256 { get; set; }
+}
+
+internal sealed class SnapshotMetadata
+{
+    public string SnapshotId { get; set; } = string.Empty;
+
+    public string SourceVersion { get; set; } = string.Empty;
+
+    public string? TargetVersion { get; set; }
+
+    public DateTimeOffset CreatedAt { get; set; }
+
+    public string SourceDirectory { get; set; } = string.Empty;
+
+    public string? TargetDirectory { get; set; }
+
+    public string Status { get; set; } = "pending";
+}
+
+internal sealed class UpdateApplyResult
+{
+    public bool Success { get; init; }
+
+    public string Message { get; init; } = string.Empty;
+
+    public string? FromVersion { get; init; }
+
+    public string? ToVersion { get; init; }
+
+    public string? RolledBackTo { get; init; }
+}

LanMountainDesktop.Launcher/Program.cs

@@ -0,0 +1,48 @@
+using Avalonia;
+using LanMountainDesktop.Launcher.Models;
+using LanMountainDesktop.Launcher.Services;
+
+namespace LanMountainDesktop.Launcher;
+
+internal static class Program
+{
+    [STAThread]
+    private static async Task<int> Main(string[] args)
+    {
+        var commandContext = CommandContext.FromArgs(args);
+
+        // 处理遗留插件安装命令
+        if (commandContext.IsLegacyPluginInstall)
+        {
+            var installer = new PluginInstallerService();
+            return await Commands.RunLegacyPluginInstallAsync(commandContext, installer).ConfigureAwait(false);
+        }
+
+        // apply-update 命令：启动 Avalonia GUI 显示更新进度窗口
+        if (string.Equals(commandContext.Command, "apply-update", StringComparison.OrdinalIgnoreCase))
+        {
+            LauncherRuntimeContext.Current = commandContext;
+            BuildAvaloniaApp().StartWithClassicDesktopLifetime(args);
+            return Environment.ExitCode;
+        }
+
+        // 处理其他 CLI 命令 (update, plugin, rollback 等)
+        if (!string.Equals(commandContext.Command, "launch", StringComparison.OrdinalIgnoreCase))
+        {
+            return await Commands.RunCliCommandAsync(commandContext).ConfigureAwait(false);
+        }
+
+        // 主启动流程: OOBE -> Splash -> 版本选择 -> 启动主程序
+        LauncherRuntimeContext.Current = commandContext;
+        BuildAvaloniaApp().StartWithClassicDesktopLifetime(args);
+        return Environment.ExitCode;
+    }
+
+    private static AppBuilder BuildAvaloniaApp()
+    {
+        return AppBuilder.Configure<App>()
+            .UsePlatformDetect()
+            .WithInterFont()
+            .LogToTrace();
+    }
+}

LanMountainDesktop.Launcher/Properties/launchSettings.json

@@ -0,0 +1,29 @@
+{
+  "$schema": "http://json.schemastore.org/launchsettings.json",
+  "profiles": {
+    "Launcher (Launch Mode)": {
+      "commandName": "Project",
+      "commandLineArgs": "launch",
+      "workingDirectory": "$(SolutionDir)",
+      "environmentVariables": {
+        "DOTNET_ENVIRONMENT": "Development"
+      }
+    },
+    "Launcher (Update Check)": {
+      "commandName": "Project",
+      "commandLineArgs": "update check",
+      "workingDirectory": "$(SolutionDir)",
+      "environmentVariables": {
+        "DOTNET_ENVIRONMENT": "Development"
+      }
+    },
+    "Launcher (Plugin Install)": {
+      "commandName": "Project",
+      "commandLineArgs": "plugin install <path-to-plugin.laapp>",
+      "workingDirectory": "$(SolutionDir)",
+      "environmentVariables": {
+        "DOTNET_ENVIRONMENT": "Development"
+      }
+    }
+  }
+}

LanMountainDesktop.Launcher/Services/Commands.cs

@@ -0,0 +1,193 @@
+using System.Text;
+using System.Text.Json;
+using LanMountainDesktop.Launcher.Models;
+
+namespace LanMountainDesktop.Launcher.Services;
+
+internal static class Commands
+{
+    public static async Task<int> RunLegacyPluginInstallAsync(CommandContext context, PluginInstallerService installer)
+    {
+        var resultPath = context.GetOption("result");
+        LauncherResult result;
+        try
+        {
+            var source = context.GetOption("source") ?? string.Empty;
+            var pluginsDir = context.GetOption("plugins-dir") ?? string.Empty;
+            result = installer.InstallPackage(source, pluginsDir);
+        }
+        catch (Exception ex)
+        {
+            result = new LauncherResult
+            {
+                Success = false,
+                Stage = "plugin.install",
+                Code = "failed",
+                Message = ex.Message,
+                ErrorMessage = ex.Message
+            };
+        }
+
+        await WriteResultIfNeededAsync(resultPath, result).ConfigureAwait(false);
+        return result.Success ? 0 : 1;
+    }
+
+    public static async Task<int> RunCliCommandAsync(CommandContext context)
+    {
+        var appRoot = ResolveAppRoot(context);
+        var deploymentLocator = new DeploymentLocator(appRoot);
+        var updateEngine = new UpdateEngineService(deploymentLocator);
+        var pluginInstaller = new PluginInstallerService();
+        var pluginUpgrades = new PluginUpgradeQueueService(pluginInstaller);
+
+        LauncherResult result;
+        try
+        {
+            result = await ExecuteCoreAsync(context, updateEngine, pluginInstaller, pluginUpgrades).ConfigureAwait(false);
+        }
+        catch (Exception ex)
+        {
+            result = new LauncherResult
+            {
+                Success = false,
+                Stage = "command",
+                Code = "exception",
+                Message = ex.Message,
+                ErrorMessage = ex.Message
+            };
+        }
+
+        await WriteResultIfNeededAsync(context.GetOption("result"), result).ConfigureAwait(false);
+        return result.Success ? 0 : 1;
+    }
+
+    private static async Task<LauncherResult> ExecuteCoreAsync(
+        CommandContext context,
+        UpdateEngineService updateEngine,
+        PluginInstallerService pluginInstaller,
+        PluginUpgradeQueueService pluginUpgrades)
+    {
+        switch (context.Command.ToLowerInvariant())
+        {
+            case "update":
+                return await ExecuteUpdateAsync(context, updateEngine).ConfigureAwait(false);
+            case "plugin":
+                return ExecutePluginCommand(context, pluginInstaller, pluginUpgrades);
+            default:
+                return new LauncherResult
+                {
+                    Success = false,
+                    Stage = "command",
+                    Code = "unsupported_command",
+                    Message = $"Unsupported command '{context.Command}'."
+                };
+        }
+    }
+
+    private static async Task<LauncherResult> ExecuteUpdateAsync(CommandContext context, UpdateEngineService updateEngine)
+    {
+        return context.SubCommand.ToLowerInvariant() switch
+        {
+            "check" => updateEngine.CheckPendingUpdate(),
+            "apply" => await updateEngine.ApplyPendingUpdateAsync().ConfigureAwait(false),
+            "rollback" => updateEngine.RollbackLatest(),
+            "download" => await DownloadUpdatePayloadAsync(context, updateEngine).ConfigureAwait(false),
+            _ => new LauncherResult
+            {
+                Success = false,
+                Stage = "update",
+                Code = "unsupported_subcommand",
+                Message = $"Unsupported update sub-command '{context.SubCommand}'."
+            }
+        };
+    }
+
+    private static async Task<LauncherResult> DownloadUpdatePayloadAsync(CommandContext context, UpdateEngineService updateEngine)
+    {
+        return await updateEngine.DownloadAsync(
+            context.GetOption("manifest-url") ?? throw new InvalidOperationException("Missing --manifest-url."),
+            context.GetOption("signature-url") ?? throw new InvalidOperationException("Missing --signature-url."),
+            context.GetOption("archive-url") ?? throw new InvalidOperationException("Missing --archive-url."),
+            CancellationToken.None).ConfigureAwait(false);
+    }
+
+    private static LauncherResult ExecutePluginCommand(
+        CommandContext context,
+        PluginInstallerService pluginInstaller,
+        PluginUpgradeQueueService pluginUpgrades)
+    {
+        switch (context.SubCommand.ToLowerInvariant())
+        {
+            case "install":
+            {
+                var source = context.GetOption("source") ?? throw new InvalidOperationException("Missing --source.");
+                var pluginsDir = context.GetOption("plugins-dir") ?? throw new InvalidOperationException("Missing --plugins-dir.");
+                return pluginInstaller.InstallPackage(source, pluginsDir);
+            }
+            case "update":
+            {
+                var pluginsDir = context.GetOption("plugins-dir") ?? throw new InvalidOperationException("Missing --plugins-dir.");
+                return pluginUpgrades.ApplyPendingUpgrades(pluginsDir);
+            }
+            default:
+                return new LauncherResult
+                {
+                    Success = false,
+                    Stage = "plugin",
+                    Code = "unsupported_subcommand",
+                    Message = $"Unsupported plugin sub-command '{context.SubCommand}'."
+                };
+        }
+    }
+
+    public static async Task WriteResultIfNeededAsync(string? resultPath, LauncherResult result)
+    {
+        if (string.IsNullOrWhiteSpace(resultPath))
+        {
+            return;
+        }
+
+        var fullPath = Path.GetFullPath(resultPath);
+        var dir = Path.GetDirectoryName(fullPath);
+        if (!string.IsNullOrWhiteSpace(dir))
+        {
+            Directory.CreateDirectory(dir);
+        }
+
+        var json = JsonSerializer.Serialize(result, AppJsonContext.Default.LauncherResult);
+        await File.WriteAllTextAsync(fullPath, json, Encoding.UTF8).ConfigureAwait(false);
+    }
+
+    public static string ResolveAppRoot(CommandContext context)
+    {
+        var configured = context.GetOption("app-root");
+        if (!string.IsNullOrWhiteSpace(configured))
+        {
+            return Path.GetFullPath(configured);
+        }
+
+        var baseDir = AppContext.BaseDirectory;
+        
+        // 发布版结构：Launcher 和 app-* 目录在同一目录
+        // 检查当前目录是否有 app-* 子目录（发布版）
+        var appDirs = Directory.GetDirectories(baseDir, "app-*", SearchOption.TopDirectoryOnly);
+        if (appDirs.Length > 0)
+        {
+            // 找到 app-* 目录，说明是发布版结构
+            return baseDir;
+        }
+        
+        // 开发环境：检查父目录是否有主程序
+        var parent = Path.GetFullPath(Path.Combine(baseDir, ".."));
+        var parentHost = OperatingSystem.IsWindows()
+            ? Path.Combine(parent, "LanMountainDesktop.exe")
+            : Path.Combine(parent, "LanMountainDesktop");
+        if (File.Exists(parentHost))
+        {
+            return parent;
+        }
+        
+        // 默认返回 baseDir
+        return baseDir;
+    }
+}

LanMountainDesktop.Launcher/Services/DeferredSplashStageReporter.cs

@@ -0,0 +1,40 @@
+using Avalonia.Threading;
+using LanMountainDesktop.Launcher.Views;
+
+namespace LanMountainDesktop.Launcher.Services;
+
+internal sealed class DeferredSplashStageReporter : ISplashStageReporter
+{
+    private ISplashStageReporter? _inner;
+    private readonly List<(string Stage, string Message)> _pending = [];
+
+    public void SetInner(ISplashStageReporter inner)
+    {
+        _inner = inner;
+        foreach (var (stage, message) in _pending)
+        {
+            _inner.Report(stage, message);
+        }
+        _pending.Clear();
+    }
+
+    public void Report(string stage, string message)
+    {
+        if (_inner is not null)
+        {
+            _inner.Report(stage, message);
+        }
+        else
+        {
+            _pending.Add((stage, message));
+        }
+    }
+
+    public void ReportStage(string stage, int progress)
+    {
+        if (_inner is not null)
+        {
+            _inner.ReportStage(stage, progress);
+        }
+    }
+}

LanMountainDesktop.Launcher/Services/DeploymentLocator.cs

@@ -0,0 +1,468 @@
+using System.Globalization;
+using System.Text.Json;
+using LanMountainDesktop.Launcher.Models;
+using LanMountainDesktop.Shared.Contracts.Launcher;
+
+namespace LanMountainDesktop.Launcher.Services;
+
+internal sealed class DeploymentLocator
+{
+    private readonly string _appRoot;
+
+    public DeploymentLocator(string appRoot)
+    {
+        _appRoot = appRoot;
+    }
+
+    public string GetAppRoot() => _appRoot;
+
+    public string? FindCurrentDeploymentDirectory()
+    {
+        Console.WriteLine("[DeploymentLocator] Searching for deployment directories (ClassIsland style)...");
+
+        if (!Directory.Exists(_appRoot))
+        {
+            Console.WriteLine("[DeploymentLocator] App root directory does not exist");
+            return null;
+        }
+
+        var executable = OperatingSystem.IsWindows() ? "LanMountainDesktop.exe" : "LanMountainDesktop";
+
+        try
+        {
+            var candidates = Directory.GetDirectories(_appRoot, "app-*", SearchOption.TopDirectoryOnly);
+            Console.WriteLine($"[DeploymentLocator] Found {candidates.Length} app-* directories");
+
+            // ClassIsland 风格的查询：先筛选，后排序
+            var validInstallations = candidates
+                .Where(path =>
+                {
+                    var hasDestroy = File.Exists(Path.Combine(path, ".destroy"));
+                    var hasPartial = File.Exists(Path.Combine(path, ".partial"));
+                    var hasExe = File.Exists(Path.Combine(path, executable));
+                    var hasCurrent = File.Exists(Path.Combine(path, ".current"));
+                    var version = ParseVersionFromDirectory(path);
+
+                    Console.WriteLine($"[DeploymentLocator] Candidate: {Path.GetFileName(path)} | " +
+                        $"Version={version} | " +
+                        $"Current={hasCurrent} | " +
+                        $"Destroy={hasDestroy} | " +
+                        $"Partial={hasPartial} | " +
+                        $"HasExe={hasExe}");
+
+                    return !hasDestroy && !hasPartial && hasExe;
+                })
+                .Select(path => new
+                {
+                    Path = path,
+                    Version = ParseVersionFromDirectory(path),
+                    HasCurrentMarker = File.Exists(Path.Combine(path, ".current"))
+                })
+                .OrderBy(x => x.HasCurrentMarker ? 0 : 1)  // .current 标记的排前面
+                .ThenByDescending(x => x.Version)  // 然后按版本号降序
+                .ToList();
+
+            if (validInstallations.Count == 0)
+            {
+                Console.WriteLine("[DeploymentLocator] No valid deployment directories found");
+                return null;
+            }
+
+            var best = validInstallations[0];
+            Console.WriteLine($"[DeploymentLocator] Selected: {Path.GetFileName(best.Path)} (current={best.HasCurrentMarker}, version={best.Version})");
+            return best.Path;
+        }
+        catch (Exception ex)
+        {
+            Console.Error.WriteLine($"[DeploymentLocator] Error searching for deployments: {ex}");
+            return null;
+        }
+    }
+
+    public string? ResolveHostExecutablePath()
+    {
+        // 使用新的灵活定位器
+        var options = new HostDiscoveryOptions
+        {
+            ExecutableName = "LanMountainDesktop",
+            PreferDevModeConfig = true,
+            RecursiveSearch = false, // 默认不启用递归搜索以提高性能
+            AdditionalSearchPaths = new List<string>
+            {
+                // 可以通过配置文件或环境变量添加更多路径
+                "${AppRoot}",
+                "${AppRoot}/..",
+                "${BaseDirectory}/../..",
+            }
+        };
+
+        var locator = new FlexibleHostLocator(_appRoot, options);
+        var result = locator.ResolveHostExecutablePath();
+        
+        if (result != null)
+        {
+            return result;
+        }
+
+        // 回退到旧逻辑（作为备选）
+        return ResolveHostExecutablePathLegacy();
+    }
+
+    /// <summary>
+    /// 传统的主程序路径解析（作为备选）
+    /// </summary>
+    private string? ResolveHostExecutablePathLegacy()
+    {
+        var executable = OperatingSystem.IsWindows() ? "LanMountainDesktop.exe" : "LanMountainDesktop";
+        
+        // 1. 首先查找 app-{version} 目录（生产环境）
+        var currentDeployment = FindCurrentDeploymentDirectory();
+        if (!string.IsNullOrWhiteSpace(currentDeployment))
+        {
+            var inDeployment = Path.Combine(currentDeployment, executable);
+            if (File.Exists(inDeployment))
+            {
+                return inDeployment;
+            }
+        }
+
+        // 2. 查找 Launcher 所在目录（开发环境 - 直接运行）
+        var inRoot = Path.Combine(_appRoot, executable);
+        if (File.Exists(inRoot))
+        {
+            return inRoot;
+        }
+
+        // 3. 查找父目录（开发环境 - 从 Launcher 项目运行）
+        var parent = Path.GetFullPath(Path.Combine(_appRoot, ".."));
+        var inParent = Path.Combine(parent, executable);
+        if (File.Exists(inParent))
+        {
+            return inParent;
+        }
+
+        // 4. 开发模式：如果启用了开发模式，优先使用保存的自定义路径
+        if (Views.ErrorWindow.CheckDevModeEnabled())
+        {
+            // 4.1 首先检查保存的自定义路径
+            var savedCustomPath = Views.ErrorWindow.GetSavedCustomHostPath();
+            if (!string.IsNullOrWhiteSpace(savedCustomPath) && File.Exists(savedCustomPath))
+            {
+                return savedCustomPath;
+            }
+
+            // 4.2 扫描开发路径
+            var devPath = ScanDevelopmentPaths(executable);
+            if (!string.IsNullOrWhiteSpace(devPath))
+            {
+                return devPath;
+            }
+        }
+
+        // 5. 开发模式：查找主程序项目的输出目录
+        var devPaths = GetDevelopmentPaths(executable);
+        foreach (var devPath in devPaths)
+        {
+            if (File.Exists(devPath))
+            {
+                return devPath;
+            }
+        }
+
+        return null;
+    }
+
+    /// <summary>
+    /// 扫描开发路径（开发模式）
+    /// </summary>
+    private static string? ScanDevelopmentPaths(string executable)
+    {
+        var possiblePaths = new[]
+        {
+            // 从 Launcher 项目运行
+            Path.Combine(AppContext.BaseDirectory, "..", "..", "LanMountainDesktop", "bin", "Debug", "net10.0", executable),
+            Path.Combine(AppContext.BaseDirectory, "..", "..", "LanMountainDesktop", "bin", "Release", "net10.0", executable),
+            
+            // 从解决方案根目录运行
+            Path.Combine(AppContext.BaseDirectory, "..", "LanMountainDesktop", "bin", "Debug", "net10.0", executable),
+            Path.Combine(AppContext.BaseDirectory, "..", "LanMountainDesktop", "bin", "Release", "net10.0", executable),
+            
+            // dev-test 目录
+            Path.Combine(AppContext.BaseDirectory, "..", "dev-test", "app-1.0.0-dev", executable),
+        };
+
+        foreach (var path in possiblePaths.Select(Path.GetFullPath).Distinct())
+        {
+            if (File.Exists(path))
+            {
+                return path;
+            }
+        }
+
+        return null;
+    }
+
+    /// <summary>
+    /// 获取开发环境可能的主程序路径
+    /// </summary>
+    private static IEnumerable<string> GetDevelopmentPaths(string executable)
+    {
+        // 获取 Launcher 所在目录
+        var launcherDir = AppContext.BaseDirectory;
+        
+        // 可能的开发目录结构
+        var possiblePaths = new[]
+        {
+            // 从 Launcher 项目运行：..\LanMountainDesktop\bin\Debug\net10.0\LanMountainDesktop.exe
+            Path.Combine(launcherDir, "..", "..", "LanMountainDesktop", "bin", "Debug", "net10.0", executable),
+            Path.Combine(launcherDir, "..", "..", "LanMountainDesktop", "bin", "Release", "net10.0", executable),
+            
+            // 从解决方案根目录运行：LanMountainDesktop\bin\Debug\net10.0\LanMountainDesktop.exe
+            Path.Combine(launcherDir, "..", "LanMountainDesktop", "bin", "Debug", "net10.0", executable),
+            Path.Combine(launcherDir, "..", "LanMountainDesktop", "bin", "Release", "net10.0", executable),
+            
+            // 从 dev-test 目录运行
+            Path.Combine(launcherDir, "..", "dev-test", "app-1.0.0-dev", executable),
+        };
+
+        return possiblePaths.Select(Path.GetFullPath).Distinct();
+    }
+
+    public string GetCurrentVersion()
+    {
+        var deployment = FindCurrentDeploymentDirectory();
+        if (string.IsNullOrWhiteSpace(deployment))
+        {
+            return "0.0.0";
+        }
+
+        return ParseVersionTextFromDirectory(deployment) ?? "0.0.0";
+    }
+
+    public string BuildNextDeploymentDirectory(string targetVersion)
+    {
+        var sanitized = string.IsNullOrWhiteSpace(targetVersion) ? "0.0.0" : targetVersion.Trim();
+        var index = 0;
+        while (true)
+        {
+            var candidate = Path.Combine(_appRoot, $"app-{sanitized}-{index.ToString(CultureInfo.InvariantCulture)}");
+            if (!Directory.Exists(candidate))
+            {
+                return candidate;
+            }
+
+            index++;
+        }
+    }
+
+    /// <summary>
+    /// 清理旧版本部署，保留最近的N个版本
+    /// </summary>
+    /// <param name="minVersionsToKeep">最少保留版本数，默认3个</param>
+    public void CleanupOldDeployments(int minVersionsToKeep = 3)
+    {
+        try
+        {
+            Console.WriteLine($"[DeploymentLocator] Starting cleanup with retention policy: keep at least {minVersionsToKeep} versions");
+
+            if (!Directory.Exists(_appRoot))
+            {
+                return;
+            }
+
+            var candidates = Directory.GetDirectories(_appRoot, "app-*", SearchOption.TopDirectoryOnly);
+
+            // 过滤掉无效部署目录（排除partial），按版本排序
+            var validDeployments = candidates
+                .Where(path => !File.Exists(Path.Combine(path, ".partial")))
+                .Select(path => new
+                {
+                    Path = path,
+                    Version = ParseVersionFromDirectory(path),
+                    IsDestroyed = File.Exists(Path.Combine(path, ".destroy")),
+                    IsCurrent = File.Exists(Path.Combine(path, ".current"))
+                })
+                .OrderByDescending(item => item.Version)
+                .ToList();
+
+            Console.WriteLine($"[DeploymentLocator] Found {validDeployments.Count} valid deployments");
+
+            // 确定要保留的版本
+            var versionsToKeep = new HashSet<string>();
+
+            // 1. 总是保留当前版本
+            var currentVersion = validDeployments.FirstOrDefault(d => d.IsCurrent);
+            if (currentVersion != null)
+            {
+                versionsToKeep.Add(currentVersion.Path);
+                Console.WriteLine($"[DeploymentLocator] Keep current version: {currentVersion.Path}");
+            }
+
+            // 2. 保留最近的N个有效版本（不包括已标记destroy的）
+            var activeVersions = validDeployments
+                .Where(d => !d.IsDestroyed)
+                .Take(minVersionsToKeep)
+                .ToList();
+
+            foreach (var ver in activeVersions)
+            {
+                versionsToKeep.Add(ver.Path);
+                Console.WriteLine($"[DeploymentLocator] Keep recent version: {ver.Path}");
+            }
+
+            // 3. 保留有快照的版本（用于回滚）
+            var snapshotDir = Path.Combine(_appRoot, ".launcher", "snapshots");
+            if (Directory.Exists(snapshotDir))
+            {
+                try
+                {
+                    var snapshotFiles = Directory.GetFiles(snapshotDir, "*.json", SearchOption.TopDirectoryOnly);
+                    foreach (var snapshotFile in snapshotFiles)
+                    {
+                        try
+                        {
+                            var json = File.ReadAllText(snapshotFile);
+                            var snapshot = System.Text.Json.JsonSerializer.Deserialize(json, AppJsonContext.Default.SnapshotMetadata);
+                            if (snapshot != null && !string.IsNullOrEmpty(snapshot.SourceDirectory))
+                            {
+                                if (Directory.Exists(snapshot.SourceDirectory))
+                                {
+                                    versionsToKeep.Add(snapshot.SourceDirectory);
+                                    Console.WriteLine($"[DeploymentLocator] Keep version for rollback: {snapshot.SourceDirectory}");
+                                }
+                            }
+                        }
+                        catch
+                        {
+                            // 忽略快照解析错误
+                        }
+                    }
+                }
+                catch
+                {
+                    // 忽略快照目录访问错误
+                }
+            }
+
+            // 清理不需要的版本
+            foreach (var deployment in validDeployments)
+            {
+                if (versionsToKeep.Contains(deployment.Path))
+                {
+                    // 保留此版本，如果之前标记了destroy则取消标记
+                    if (deployment.IsDestroyed)
+                    {
+                        try
+                        {
+                            File.Delete(Path.Combine(deployment.Path, ".destroy"));
+                            Console.WriteLine($"[DeploymentLocator] Unmarked for deletion (kept): {deployment.Path}");
+                        }
+                        catch
+                        {
+                            // 忽略取消标记失败
+                        }
+                    }
+                    continue;
+                }
+
+                // 如果还没标记destroy的，先标记
+                if (!deployment.IsDestroyed)
+                {
+                    try
+                    {
+                        File.WriteAllText(Path.Combine(deployment.Path, ".destroy"), string.Empty);
+                        Console.WriteLine($"[DeploymentLocator] Marked for deletion: {deployment.Path}");
+                    }
+                    catch
+                    {
+                        // 忽略标记失败
+                    }
+                }
+
+                // 尝试删除
+                try
+                {
+                    Directory.Delete(deployment.Path, recursive: true);
+                    Console.WriteLine($"[DeploymentLocator] Deleted: {deployment.Path}");
+                }
+                catch
+                {
+                    // 忽略删除失败(可能文件被占用),下次启动再试
+                    Console.WriteLine($"[DeploymentLocator] Failed to delete (will retry later): {deployment.Path}");
+                }
+            }
+        }
+        catch (Exception ex)
+        {
+            Console.Error.WriteLine($"[DeploymentLocator] Cleanup failed: {ex.Message}");
+            // 忽略清理失败
+        }
+    }
+
+    /// <summary>
+    /// 仅清理已标记为.destroy的部署（兼容旧方法）
+    /// </summary>
+    [Obsolete("Use CleanupOldDeployments instead")]
+    public void CleanupDestroyedDeployments()
+    {
+        CleanupOldDeployments(3);
+    }
+
+    public static Version ParseVersionFromDirectory(string path)
+    {
+        var text = ParseVersionTextFromDirectory(path);
+        return Version.TryParse(text, out var version) ? version : new Version(0, 0, 0);
+    }
+
+    private static string? ParseVersionTextFromDirectory(string path)
+    {
+        var fileName = Path.GetFileName(path);
+        if (string.IsNullOrWhiteSpace(fileName))
+        {
+            return null;
+        }
+
+        var segments = fileName.Split('-');
+        if (segments.Length < 2)
+        {
+            return null;
+        }
+
+        return segments[1];
+    }
+
+    /// <summary>
+    /// 从部署目录读取版本信息
+    /// </summary>
+    public AppVersionInfo GetVersionInfo()
+    {
+        var deploymentDir = FindCurrentDeploymentDirectory();
+        if (!string.IsNullOrWhiteSpace(deploymentDir))
+        {
+            var versionFile = Path.Combine(deploymentDir, "version.json");
+            if (File.Exists(versionFile))
+            {
+                try
+                {
+                    var json = File.ReadAllText(versionFile);
+                    var info = JsonSerializer.Deserialize(json, AppJsonContext.Default.AppVersionInfo);
+                    if (info is not null)
+                    {
+                        return info;
+                    }
+                }
+                catch
+                {
+                    // 忽略读取失败，回退到默认值
+                }
+            }
+        }
+
+        // 回退：从目录名解析版本，使用默认开发代号
+        return new AppVersionInfo
+        {
+            Version = GetCurrentVersion(),
+            Codename = "Administrate" // 默认开发代号
+        };
+    }
+}

LanMountainDesktop.Launcher/Services/FlexibleHostLocator.cs

@@ -0,0 +1,629 @@
+using System.Diagnostics;
+using System.Text.Json;
+
+namespace LanMountainDesktop.Launcher.Services;
+
+/// <summary>
+    /// 灵活的主程序定位器
+    /// </summary>
+    internal sealed class FlexibleHostLocator
+    {
+        private readonly HostDiscoveryOptions _options;
+        private readonly string _appRoot;
+        private readonly DeploymentLocator _deploymentLocator;
+
+        public FlexibleHostLocator(string appRoot, HostDiscoveryOptions? options = null)
+        {
+            _appRoot = appRoot;
+            _options = options ?? new HostDiscoveryOptions();
+            _deploymentLocator = new DeploymentLocator(appRoot);
+        }
+
+        /// <summary>
+        /// 解析主程序可执行文件路径
+        /// </summary>
+        public string? ResolveHostExecutablePath()
+        {
+            var executable = GetExecutableName();
+            var searchContext = new SearchContext
+            {
+                ExecutableName = executable,
+                AppRoot = _appRoot,
+                Options = _options
+            };
+
+            // ========== 第一阶段：标准路径查找（快速路径）==========
+            
+            // 1. 检查环境变量指定的路径（最高优先级 - 用于调试和特殊场景）
+            var envPath = GetPathFromEnvironment();
+            if (!string.IsNullOrWhiteSpace(envPath))
+            {
+                var validated = ValidateAndReturn(envPath, "environment variable");
+                if (validated != null) return validated;
+            }
+
+            // 2. 使用 DeploymentLocator（ClassIsland 风格的简洁查询 - 优先）
+            Console.WriteLine("[FlexibleHostLocator] Trying quick path: DeploymentLocator.FindCurrentDeploymentDirectory()");
+            var deploymentDir = _deploymentLocator.FindCurrentDeploymentDirectory();
+            if (!string.IsNullOrWhiteSpace(deploymentDir))
+            {
+                var deploymentExePath = Path.Combine(deploymentDir, executable);
+                if (File.Exists(deploymentExePath))
+                {
+                    Console.WriteLine($"[FlexibleHostLocator] Quick path found: {deploymentExePath}");
+                    return deploymentExePath;
+                }
+                Console.WriteLine($"[FlexibleHostLocator] Quick path found dir but no exe: {deploymentExePath}");
+            }
+
+            // 3. 快速路径失败，尝试旧的 SearchDeploymentDirectories 作为 fallback
+            Console.WriteLine("[FlexibleHostLocator] Quick path failed, falling back to SearchDeploymentDirectories");
+            var deploymentPath = SearchDeploymentDirectories(searchContext);
+            if (!string.IsNullOrWhiteSpace(deploymentPath))
+            {
+                return deploymentPath;
+            }
+
+        // 4. 检查 Launcher 同级目录（便携模式）
+        var portablePath = SearchPortableLocation(searchContext);
+        if (!string.IsNullOrWhiteSpace(portablePath))
+        {
+            return portablePath;
+        }
+
+        // ========== 第二阶段：灵活查找（标准路径找不到时）==========
+        
+        // 5. 检查配置文件中的路径 - 用户自定义配置
+        var configPath = GetPathFromConfigFile();
+        if (!string.IsNullOrWhiteSpace(configPath))
+        {
+            var validated = ValidateAndReturn(configPath, "config file");
+            if (validated != null) return validated;
+        }
+
+        // 5. 搜索附近目录（向上、向下各一层）
+        var nearbyPath = SearchNearbyDirectories(searchContext);
+        if (!string.IsNullOrWhiteSpace(nearbyPath))
+        {
+            return nearbyPath;
+        }
+
+        // 7. 开发模式：检查保存的自定义路径
+        if (_options.PreferDevModeConfig && Views.ErrorWindow.CheckDevModeEnabled())
+        {
+            var savedPath = Views.ErrorWindow.GetSavedCustomHostPath();
+            if (!string.IsNullOrWhiteSpace(savedPath))
+            {
+                var validated = ValidateAndReturn(savedPath, "saved dev mode path");
+                if (validated != null) return validated;
+            }
+        }
+
+        // 8. 搜索标准开发路径
+        var devPath = SearchDevelopmentPaths(searchContext);
+        if (!string.IsNullOrWhiteSpace(devPath))
+        {
+            return devPath;
+        }
+
+        // 9. 搜索额外的配置路径
+        var additionalPath = SearchAdditionalPaths(searchContext);
+        if (!string.IsNullOrWhiteSpace(additionalPath))
+        {
+            return additionalPath;
+        }
+
+        // 10. 递归搜索（如果启用）
+        if (_options.RecursiveSearch)
+        {
+            var recursivePath = SearchRecursively(searchContext);
+            if (!string.IsNullOrWhiteSpace(recursivePath))
+            {
+                return recursivePath;
+            }
+        }
+
+        return null;
+    }
+
+    /// <summary>
+    /// 从环境变量获取路径
+    /// </summary>
+    private string? GetPathFromEnvironment()
+    {
+        if (string.IsNullOrWhiteSpace(_options.CustomPathEnvVar))
+        {
+            return null;
+        }
+
+        var path = Environment.GetEnvironmentVariable(_options.CustomPathEnvVar);
+        return path;
+    }
+
+    /// <summary>
+    /// 从配置文件获取路径
+    /// </summary>
+    private string? GetPathFromConfigFile()
+    {
+        if (string.IsNullOrWhiteSpace(_options.ConfigFileName))
+        {
+            return null;
+        }
+
+        var configPath = Path.Combine(_appRoot, _options.ConfigFileName);
+        if (!File.Exists(configPath))
+        {
+            return null;
+        }
+
+        try
+        {
+            var json = File.ReadAllText(configPath);
+            var config = JsonSerializer.Deserialize(json, AppJsonContext.Default.HostDiscoveryConfig);
+            if (config?.HostPath != null && File.Exists(config.HostPath))
+            {
+                return config.HostPath;
+            }
+        }
+        catch
+        {
+            // 忽略配置文件读取错误
+        }
+
+        return null;
+    }
+
+    /// <summary>
+    /// 搜索部署目录
+    /// </summary>
+    private string? SearchDeploymentDirectories(SearchContext context)
+    {
+        if (!Directory.Exists(_appRoot))
+        {
+            return null;
+        }
+
+        try
+        {
+            // 查找 app-* 目录
+            var appDirs = Directory.GetDirectories(_appRoot, "app-*", SearchOption.TopDirectoryOnly)
+                .Where(dir => !File.Exists(Path.Combine(dir, ".destroy")))
+                .Where(dir => !File.Exists(Path.Combine(dir, ".partial")))
+                .ToList();
+
+            // 优先选择带 .current 标记的
+            var currentMarked = appDirs
+                .Where(dir => File.Exists(Path.Combine(dir, ".current")))
+                .Select(dir => Path.Combine(dir, context.ExecutableName))
+                .FirstOrDefault(File.Exists);
+
+            if (currentMarked != null)
+            {
+                return currentMarked;
+            }
+
+            // 选择版本号最高的
+            var latest = appDirs
+                .Select(dir => new
+                {
+                    Dir = dir,
+                    Version = ParseVersionFromDirectoryName(dir)
+                })
+                .OrderByDescending(x => x.Version)
+                .Select(x => Path.Combine(x.Dir, context.ExecutableName))
+                .FirstOrDefault(File.Exists);
+
+            return latest;
+        }
+        catch
+        {
+            return null;
+        }
+    }
+
+    /// <summary>
+    /// 搜索便携模式位置（Launcher 同级目录）
+    /// </summary>
+    private string? SearchPortableLocation(SearchContext context)
+    {
+        try
+        {
+            var launcherDir = AppContext.BaseDirectory;
+            var portablePath = Path.Combine(launcherDir, context.ExecutableName);
+            
+            if (File.Exists(portablePath))
+            {
+                return portablePath;
+            }
+        }
+        catch
+        {
+            // 忽略错误
+        }
+        return null;
+    }
+
+    /// <summary>
+    /// 搜索附近目录（灵活查找，适用于各种部署场景）
+    /// </summary>
+    private string? SearchNearbyDirectories(SearchContext context)
+    {
+        try
+        {
+            var searchDirs = new List<string>();
+            
+            // Launcher 所在目录
+            var launcherDir = AppContext.BaseDirectory;
+            searchDirs.Add(launcherDir);
+            
+            // 上级目录
+            var parentDir = Path.GetFullPath(Path.Combine(launcherDir, ".."));
+            if (Directory.Exists(parentDir))
+            {
+                searchDirs.Add(parentDir);
+            }
+            
+            // 上上级目录
+            var grandparentDir = Path.GetFullPath(Path.Combine(launcherDir, "..", ".."));
+            if (Directory.Exists(grandparentDir))
+            {
+                searchDirs.Add(grandparentDir);
+            }
+            
+            // AppRoot 及其上级
+            if (!string.IsNullOrWhiteSpace(_appRoot) && Directory.Exists(_appRoot))
+            {
+                searchDirs.Add(_appRoot);
+                var appParent = Path.GetFullPath(Path.Combine(_appRoot, ".."));
+                if (Directory.Exists(appParent))
+                {
+                    searchDirs.Add(appParent);
+                }
+            }
+            
+            // 去重后搜索
+            foreach (var dir in searchDirs.Distinct(StringComparer.OrdinalIgnoreCase))
+            {
+                // 直接搜索
+                var directPath = Path.Combine(dir, context.ExecutableName);
+                if (File.Exists(directPath))
+                {
+                    return directPath;
+                }
+                
+                // 搜索子目录（一层）
+                if (Directory.Exists(dir))
+                {
+                    foreach (var subDir in Directory.GetDirectories(dir))
+                    {
+                        var subPath = Path.Combine(subDir, context.ExecutableName);
+                        if (File.Exists(subPath))
+                        {
+                            return subPath;
+                        }
+                    }
+                }
+            }
+        }
+        catch
+        {
+            // 忽略搜索错误
+        }
+        
+        return null;
+    }
+
+    /// <summary>
+    /// 搜索开发路径
+    /// </summary>
+    private string? SearchDevelopmentPaths(SearchContext context)
+    {
+        // 获取 Launcher 所在目录
+        var launcherDir = AppContext.BaseDirectory;
+
+        // 动态构建可能的开发路径（支持不同的项目结构）
+        var possiblePaths = new List<string>();
+
+        // 从解决方案根目录搜索（支持不同的解决方案结构）
+        var solutionRoot = FindSolutionRoot(launcherDir);
+        if (!string.IsNullOrWhiteSpace(solutionRoot))
+        {
+            // 搜索所有可能的 bin 目录
+            possiblePaths.AddRange(SearchBinDirectories(solutionRoot, context.ExecutableName));
+        }
+
+        // 添加硬编码的备用路径
+        possiblePaths.AddRange(new[]
+        {
+            Path.Combine(launcherDir, "..", "..", "LanMountainDesktop", "bin", "Debug", "net10.0", context.ExecutableName),
+            Path.Combine(launcherDir, "..", "..", "LanMountainDesktop", "bin", "Release", "net10.0", context.ExecutableName),
+            Path.Combine(launcherDir, "..", "LanMountainDesktop", "bin", "Debug", "net10.0", context.ExecutableName),
+            Path.Combine(launcherDir, "..", "LanMountainDesktop", "bin", "Release", "net10.0", context.ExecutableName),
+        });
+
+        foreach (var path in possiblePaths.Select(Path.GetFullPath).Distinct())
+        {
+            if (File.Exists(path))
+            {
+                return path;
+            }
+        }
+
+        return null;
+    }
+
+    /// <summary>
+    /// 搜索额外的配置路径
+    /// </summary>
+    private string? SearchAdditionalPaths(SearchContext context)
+    {
+        if (_options.AdditionalSearchPaths == null || !_options.AdditionalSearchPaths.Any())
+        {
+            return null;
+        }
+
+        foreach (var pattern in _options.AdditionalSearchPaths)
+        {
+            try
+            {
+                // 替换变量
+                var expandedPattern = ExpandVariables(pattern);
+
+                // 支持通配符
+                if (expandedPattern.Contains('*') || expandedPattern.Contains('?'))
+                {
+                    var dir = Path.GetDirectoryName(expandedPattern) ?? _appRoot;
+                    var filePattern = Path.GetFileName(expandedPattern);
+
+                    if (Directory.Exists(dir))
+                    {
+                        var matches = Directory.GetFiles(dir, filePattern, SearchOption.TopDirectoryOnly);
+                        var validMatch = matches.FirstOrDefault(File.Exists);
+                        if (validMatch != null)
+                        {
+                            return validMatch;
+                        }
+                    }
+                }
+                else if (File.Exists(expandedPattern))
+                {
+                    return expandedPattern;
+                }
+            }
+            catch
+            {
+                // 忽略搜索错误
+            }
+        }
+
+        return null;
+    }
+
+    /// <summary>
+    /// 递归搜索
+    /// </summary>
+    private string? SearchRecursively(SearchContext context)
+    {
+        try
+        {
+            var searchDirs = new[] { _appRoot, Path.GetFullPath(Path.Combine(_appRoot, "..")) };
+
+            foreach (var searchDir in searchDirs.Where(Directory.Exists))
+            {
+                var result = SearchDirectoryRecursively(searchDir, context.ExecutableName, 0);
+                if (result != null)
+                {
+                    return result;
+                }
+            }
+        }
+        catch
+        {
+            // 忽略递归搜索错误
+        }
+
+        return null;
+    }
+
+    /// <summary>
+    /// 递归搜索目录
+    /// </summary>
+    private string? SearchDirectoryRecursively(string dir, string executableName, int depth)
+    {
+        if (depth > _options.MaxRecursionDepth)
+        {
+            return null;
+        }
+
+        try
+        {
+            // 检查当前目录
+            var directPath = Path.Combine(dir, executableName);
+            if (File.Exists(directPath))
+            {
+                return directPath;
+            }
+
+            // 检查子目录
+            foreach (var subDir in Directory.GetDirectories(dir))
+            {
+                // 跳过某些目录
+                var dirName = Path.GetFileName(subDir).ToLowerInvariant();
+                if (dirName is ".git" or "node_modules" or ".vs" or "obj" or ".launcher")
+                {
+                    continue;
+                }
+
+                var result = SearchDirectoryRecursively(subDir, executableName, depth + 1);
+                if (result != null)
+                {
+                    return result;
+                }
+            }
+        }
+        catch
+        {
+            // 忽略访问错误
+        }
+
+        return null;
+    }
+
+    /// <summary>
+    /// 查找解决方案根目录
+    /// </summary>
+    private string? FindSolutionRoot(string startDir)
+    {
+        var current = new DirectoryInfo(startDir);
+        while (current != null)
+        {
+            // 查找 .sln 文件
+            if (current.GetFiles("*.sln").Any())
+            {
+                return current.FullName;
+            }
+
+            // 查找 .git 目录作为备选
+            if (current.GetDirectories(".git").Any())
+            {
+                return current.FullName;
+            }
+
+            current = current.Parent;
+        }
+
+        return null;
+    }
+
+    /// <summary>
+    /// 搜索 bin 目录
+    /// </summary>
+    private IEnumerable<string> SearchBinDirectories(string root, string executableName)
+    {
+        var results = new List<string>();
+
+        try
+        {
+            // 查找所有 bin 目录
+            var binDirs = Directory.GetDirectories(root, "bin", SearchOption.AllDirectories);
+
+            foreach (var binDir in binDirs)
+            {
+                // 检查 Debug 和 Release 子目录
+                var configDirs = new[] { "Debug", "Release" };
+                foreach (var config in configDirs)
+                {
+                    var configPath = Path.Combine(binDir, config);
+                    if (Directory.Exists(configPath))
+                    {
+                        // 检查所有 net* 子目录
+                        var frameworkDirs = Directory.GetDirectories(configPath, "net*");
+                        foreach (var fwDir in frameworkDirs)
+                        {
+                            var exePath = Path.Combine(fwDir, executableName);
+                            if (File.Exists(exePath))
+                            {
+                                results.Add(exePath);
+                            }
+                        }
+                    }
+                }
+            }
+        }
+        catch
+        {
+            // 忽略搜索错误
+        }
+
+        return results;
+    }
+
+    /// <summary>
+    /// 验证路径并返回
+    /// </summary>
+    private string? ValidateAndReturn(string path, string source)
+    {
+        if (File.Exists(path))
+        {
+            Debug.WriteLine($"Found host executable from {source}: {path}");
+            return path;
+        }
+
+        // 尝试添加 .exe（Windows）
+        if (OperatingSystem.IsWindows() && !path.EndsWith(".exe", StringComparison.OrdinalIgnoreCase))
+        {
+            var withExe = path + ".exe";
+            if (File.Exists(withExe))
+            {
+                Debug.WriteLine($"Found host executable from {source}: {withExe}");
+                return withExe;
+            }
+        }
+
+        return null;
+    }
+
+    /// <summary>
+    /// 获取可执行文件名
+    /// </summary>
+    private string GetExecutableName()
+    {
+        var name = _options.ExecutableName;
+        if (OperatingSystem.IsWindows() && !name.EndsWith(".exe", StringComparison.OrdinalIgnoreCase))
+        {
+            name += ".exe";
+        }
+        return name;
+    }
+
+    /// <summary>
+    /// 展开路径变量
+    /// </summary>
+    private string ExpandVariables(string path)
+    {
+        return path
+            .Replace("${AppRoot}", _appRoot)
+            .Replace("${BaseDirectory}", AppContext.BaseDirectory)
+            .Replace("${UserProfile}", Environment.GetFolderPath(Environment.SpecialFolder.UserProfile))
+            .Replace("${LocalAppData}", Environment.GetFolderPath(Environment.SpecialFolder.LocalApplicationData));
+    }
+
+    /// <summary>
+    /// 从目录名解析版本
+    /// </summary>
+    private static Version ParseVersionFromDirectoryName(string path)
+    {
+        var fileName = Path.GetFileName(path);
+        if (string.IsNullOrWhiteSpace(fileName))
+        {
+            return new Version(0, 0, 0);
+        }
+
+        var segments = fileName.Split('-');
+        if (segments.Length < 2)
+        {
+            return new Version(0, 0, 0);
+        }
+
+        return Version.TryParse(segments[1], out var version) ? version : new Version(0, 0, 0);
+    }
+
+    /// <summary>
+    /// 搜索上下文
+    /// </summary>
+    private class SearchContext
+    {
+        public required string ExecutableName { get; set; }
+        public required string AppRoot { get; set; }
+        public required HostDiscoveryOptions Options { get; set; }
+    }
+}
+
+/// <summary>
+/// 发现配置文件
+/// </summary>
+internal class HostDiscoveryConfig
+{
+    public string? HostPath { get; set; }
+    public List<string>? AdditionalPaths { get; set; }
+}

LanMountainDesktop.Launcher/Services/HostDiscoveryOptions.cs

@@ -0,0 +1,47 @@
+namespace LanMountainDesktop.Launcher.Services;
+
+/// <summary>
+/// 主程序发现选项
+/// </summary>
+public sealed class HostDiscoveryOptions
+{
+    /// <summary>
+    /// 可执行文件名（Windows 下自动添加 .exe）
+    /// </summary>
+    public string ExecutableName { get; set; } = "LanMountainDesktop";
+
+    /// <summary>
+    /// 额外的搜索路径（支持通配符）
+    /// </summary>
+    public List<string> AdditionalSearchPaths { get; set; } = new();
+
+    /// <summary>
+    /// 是否递归搜索子目录
+    /// </summary>
+    public bool RecursiveSearch { get; set; } = false;
+
+    /// <summary>
+    /// 递归搜索的最大深度
+    /// </summary>
+    public int MaxRecursionDepth { get; set; } = 3;
+
+    /// <summary>
+    /// 环境变量名称，用于指定自定义路径
+    /// </summary>
+    public string? CustomPathEnvVar { get; set; } = "LMD_HOST_PATH";
+
+    /// <summary>
+    /// 配置文件路径（相对于 app root）
+    /// </summary>
+    public string? ConfigFileName { get; set; } = "host-discovery.json";
+
+    /// <summary>
+    /// 是否优先使用开发模式配置
+    /// </summary>
+    public bool PreferDevModeConfig { get; set; } = true;
+
+    /// <summary>
+    /// 搜索超时（毫秒）
+    /// </summary>
+    public int SearchTimeoutMs { get; set; } = 5000;
+}

LanMountainDesktop.Launcher/Services/IOobeStep.cs

@@ -0,0 +1,6 @@
+namespace LanMountainDesktop.Launcher.Services;
+
+internal interface IOobeStep
+{
+    Task RunAsync(CancellationToken cancellationToken);
+}

LanMountainDesktop.Launcher/Services/ISplashStageReporter.cs

@@ -0,0 +1,11 @@
+namespace LanMountainDesktop.Launcher.Services;
+
+internal interface ISplashStageReporter
+{
+    void Report(string stage, string message);
+    
+    /// <summary>
+    /// 报告阶段和进度（0-100）
+    /// </summary>
+    void ReportStage(string stage, int progress);
+}

LanMountainDesktop.Launcher/Services/Ipc/LauncherIpcServer.cs

@@ -0,0 +1,192 @@
+using System.Buffers;
+using System.IO.Pipes;
+using System.Text.Json;
+using LanMountainDesktop.Shared.Contracts.Launcher;
+
+namespace LanMountainDesktop.Launcher.Services.Ipc;
+
+/// <summary>
+/// Launcher IPC 服务端 - 接收主程序的启动进度报告
+/// 采用持久连接 + 长度前缀协议，支持客户端在同一连接上多次发送消息。
+/// 跨平台实现：Windows 使用命名管道，Linux/macOS 使用 Unix 域套接字
+/// </summary>
+public class LauncherIpcServer : IDisposable
+{
+    private readonly CancellationTokenSource _cts = new();
+    private readonly Action<StartupProgressMessage> _onProgress;
+    private Task? _listenTask;
+    private NamedPipeServerStream? _currentPipe;
+
+    /// <summary>
+    /// 协议：每条消息以 4 字节小端 int32 长度前缀开头，后跟 UTF-8 JSON 正文。
+    /// 这在 Windows Message 模式和 Unix Byte 模式下均能可靠工作。
+    /// </summary>
+    private const int LengthPrefixSize = 4;
+
+    public LauncherIpcServer(Action<StartupProgressMessage> onProgress)
+    {
+        _onProgress = onProgress;
+    }
+
+    /// <summary>
+    /// 启动 IPC 服务端监听
+    /// </summary>
+    public void Start()
+    {
+        _listenTask = Task.Run(ListenLoopAsync, _cts.Token);
+    }
+
+    private async Task ListenLoopAsync()
+    {
+        while (!_cts.Token.IsCancellationRequested)
+        {
+            NamedPipeServerStream? pipe = null;
+            try
+            {
+                pipe = new NamedPipeServerStream(
+                    LauncherIpcConstants.PipeName,
+                    PipeDirection.In,
+                    1,
+                    PipeTransmissionMode.Byte);
+
+                _currentPipe = pipe;
+                await pipe.WaitForConnectionAsync(_cts.Token);
+
+                // 持久连接：在同一连接上循环读取多条消息，直到客户端断开
+                await ReadMessagesFromConnectionAsync(pipe, _cts.Token);
+            }
+            catch (OperationCanceledException)
+            {
+                break;
+            }
+            catch (IOException)
+            {
+                // 客户端断开连接，继续等待新连接
+                continue;
+            }
+            catch (ObjectDisposedException)
+            {
+                break;
+            }
+            catch (Exception ex)
+            {
+                Console.Error.WriteLine($"IPC listen error: {ex.Message}");
+                try
+                {
+                    await Task.Delay(200, _cts.Token);
+                }
+                catch (OperationCanceledException)
+                {
+                    break;
+                }
+            }
+            finally
+            {
+                try
+                {
+                    pipe?.Dispose();
+                }
+                catch { }
+
+                if (ReferenceEquals(_currentPipe, pipe))
+                {
+                    _currentPipe = null;
+                }
+            }
+        }
+    }
+
+    /// <summary>
+    /// 从已连接的管道中持续读取消息，直到连接断开或取消
+    /// </summary>
+    private async Task ReadMessagesFromConnectionAsync(NamedPipeServerStream pipe, CancellationToken cancellationToken)
+    {
+        var lengthBuffer = ArrayPool<byte>.Shared.Rent(LengthPrefixSize);
+        try
+        {
+            while (pipe.IsConnected && !cancellationToken.IsCancellationRequested)
+            {
+                // 1. 读取 4 字节长度前缀
+                var totalRead = 0;
+                while (totalRead < LengthPrefixSize)
+                {
+                    var read = await pipe.ReadAsync(lengthBuffer.AsMemory(totalRead, LengthPrefixSize - totalRead), cancellationToken);
+                    if (read == 0)
+                    {
+                        // 连接已关闭
+                        return;
+                    }
+                    totalRead += read;
+                }
+
+                var payloadLength = BitConverter.ToInt32(lengthBuffer, 0);
+                if (payloadLength <= 0 || payloadLength > 1024 * 1024) // 最大 1MB 单条消息
+                {
+                    // 无效长度，跳过此连接
+                    return;
+                }
+
+                // 2. 读取消息正文
+                var payloadBuffer = ArrayPool<byte>.Shared.Rent(payloadLength);
+                try
+                {
+                    totalRead = 0;
+                    while (totalRead < payloadLength)
+                    {
+                        var read = await pipe.ReadAsync(payloadBuffer.AsMemory(totalRead, payloadLength - totalRead), cancellationToken);
+                        if (read == 0)
+                        {
+                            return;
+                        }
+                        totalRead += read;
+                    }
+
+                    // 3. 反序列化并回调
+                    var json = System.Text.Encoding.UTF8.GetString(payloadBuffer, 0, payloadLength);
+                    var message = JsonSerializer.Deserialize(json, AppJsonContext.Default.StartupProgressMessage);
+                    if (message is not null)
+                    {
+                        _onProgress(message);
+                    }
+                }
+                catch (JsonException)
+                {
+                    // 忽略解析错误，继续读取下一条消息
+                }
+                finally
+                {
+                    ArrayPool<byte>.Shared.Return(payloadBuffer);
+                }
+            }
+        }
+        finally
+        {
+            ArrayPool<byte>.Shared.Return(lengthBuffer);
+        }
+    }
+
+    /// <summary>
+    /// 停止 IPC 服务端
+    /// </summary>
+    public void Stop()
+    {
+        _cts.Cancel();
+        try
+        {
+            _currentPipe?.Dispose();
+        }
+        catch { }
+    }
+
+    public void Dispose()
+    {
+        Stop();
+        _cts.Dispose();
+
+        try
+        {
+            _listenTask?.Wait(TimeSpan.FromSeconds(2));
+        }
+        catch { }
+    }
+}

LanMountainDesktop.Launcher/Services/LauncherFlowCoordinator.cs

@@ -0,0 +1,786 @@
+using System.Diagnostics;
+using Avalonia.Threading;
+using LanMountainDesktop.Launcher.Models;
+using LanMountainDesktop.Launcher.Services.Ipc;
+using LanMountainDesktop.Launcher.Views;
+using LanMountainDesktop.Shared.Contracts.Launcher;
+
+namespace LanMountainDesktop.Launcher.Services;
+
+internal sealed class LauncherFlowCoordinator
+{
+    private static readonly string[] LauncherOnlyOptions =
+    [
+        "debug", "show-loading-details", "plugins-dir", "source", "result",
+        LauncherIpcConstants.LauncherPidEnvVar,
+        LauncherIpcConstants.PackageRootEnvVar,
+        LauncherIpcConstants.VersionEnvVar,
+        LauncherIpcConstants.CodenameEnvVar
+    ];
+
+    private readonly CommandContext _context;
+    private readonly DeploymentLocator _deploymentLocator;
+    private readonly OobeStateService _oobeStateService;
+    private readonly UpdateEngineService _updateEngine;
+    private readonly UpdateCheckService _updateCheckService;
+    private readonly PluginInstallerService _pluginInstallerService;
+    private readonly IReadOnlyList<IOobeStep> _oobeSteps;
+
+    public LauncherFlowCoordinator(
+        CommandContext context,
+        DeploymentLocator deploymentLocator,
+        OobeStateService oobeStateService,
+        UpdateEngineService updateEngine,
+        UpdateCheckService updateCheckService,
+        PluginInstallerService pluginInstallerService)
+    {
+        _context = context;
+        _deploymentLocator = deploymentLocator;
+        _oobeStateService = oobeStateService;
+        _updateEngine = updateEngine;
+        _updateCheckService = updateCheckService;
+        _pluginInstallerService = pluginInstallerService;
+        _oobeSteps = [new WelcomeOobeStep(_oobeStateService)];
+    }
+
+    public async Task<LauncherResult> RunAsync(SplashWindow? existingSplashWindow = null)
+    {
+        try
+        {
+            // 清理旧版本，保留至少3个版本
+            _deploymentLocator.CleanupOldDeployments(minVersionsToKeep: 3);
+
+            // 检测老版本安装（首次运行时）
+            if (_oobeStateService.IsFirstRun())
+            {
+                var legacyInfo = LegacyVersionDetector.DetectLegacyInstallation();
+                if (legacyInfo != null)
+                {
+                    var migrationResult = await ShowMigrationPromptAsync(legacyInfo);
+                    // 无论用户选择什么，都继续启动流程
+                    Console.WriteLine($"[LauncherFlowCoordinator] Migration prompt result: {migrationResult}");
+                }
+            }
+
+            // 使用传入的 Splash 窗口或创建新的
+            var splashWindow = existingSplashWindow ?? await Dispatcher.UIThread.InvokeAsync(() =>
+            {
+                var window = new SplashWindow();
+                window.Show();
+                return window;
+            });
+
+            var reporter = (ISplashStageReporter)splashWindow;
+            
+            // 创建加载详情窗口（可选，用于显示详细加载状态）
+            LoadingDetailsWindow? loadingDetailsWindow = null;
+            if (_context.IsDebugMode || _context.GetOption("show-loading-details") == "true")
+            {
+                await Dispatcher.UIThread.InvokeAsync(() =>
+                {
+                    loadingDetailsWindow = new LoadingDetailsWindow();
+                    loadingDetailsWindow.Show();
+                });
+            }
+            
+            // 跟踪主程序是否已就绪，就绪后自动关闭 Splash 窗口
+            var hostReadyTcs = new TaskCompletionSource(TaskCreationOptions.RunContinuationsAsynchronously);
+            
+            // 加载状态管理
+            var loadingState = new LoadingStateMessage();
+            
+            // 启动 IPC 服务端监听主程序进度
+            using var ipcServer = new LauncherIpcServer(msg =>
+            {
+                Dispatcher.UIThread.Post(() =>
+                {
+                    try
+                    {
+                        // 更新加载状态
+                        loadingState = loadingState with
+                        {
+                            Stage = msg.Stage,
+                            OverallProgressPercent = msg.ProgressPercent,
+                            Message = msg.Message,
+                            Timestamp = DateTimeOffset.UtcNow
+                        };
+                        
+                        // 报告到 Splash 窗口
+                        reporter.Report(msg.Stage.ToString().ToLower(), msg.Message ?? "");
+                        
+                        // 更新加载详情窗口
+                        loadingDetailsWindow?.UpdateLoadingState(loadingState);
+                        
+                        // 主程序报告就绪后，关闭 Splash 窗口和加载详情窗口
+                        if (msg.Stage == StartupStage.Ready)
+                        {
+                            if (splashWindow.IsVisible && splashWindow.IsLoaded)
+                            {
+                                splashWindow.Close();
+                            }
+                            loadingDetailsWindow?.Close();
+                            hostReadyTcs.TrySetResult();
+                        }
+                    }
+                    catch (Exception ex)
+                    {
+                        Console.Error.WriteLine($"[LauncherFlowCoordinator] Error in IPC callback: {ex.Message}");
+                    }
+                });
+            });
+            ipcServer.Start();
+
+            try
+            {
+                // 检查并安装待处理的更新（主程序下载的）
+                reporter.Report("update", "检查更新...");
+                var updateResult = await _updateEngine.ApplyPendingUpdateAsync().ConfigureAwait(false);
+                if (!updateResult.Success)
+                {
+                    return updateResult;
+                }
+
+                // 检查并安装待处理的插件更新
+                reporter.Report("plugins", "检查插件更新...");
+                var pluginsDir = _context.GetOption("plugins-dir")
+                                 ?? Path.Combine(_deploymentLocator.GetAppRoot(), "plugins");
+                var queueResult = new PluginUpgradeQueueService(_pluginInstallerService).ApplyPendingUpgrades(pluginsDir);
+                if (!queueResult.Success)
+                {
+                    return queueResult;
+                }
+
+                // OOBE（首次运行引导）
+                if (_oobeStateService.IsFirstRun())
+                {
+                    await Dispatcher.UIThread.InvokeAsync(() => splashWindow.Hide());
+                    foreach (var step in _oobeSteps)
+                    {
+                        await step.RunAsync(CancellationToken.None).ConfigureAwait(false);
+                    }
+                    await Dispatcher.UIThread.InvokeAsync(() => splashWindow.Show());
+                }
+
+                // 启动主程序
+                reporter.Report("launch", "正在启动...");
+                var (hostResult, hostProcess) = await LaunchHostWithIpcAsync(splashWindow);
+                if (!hostResult.Success)
+                {
+                    return hostResult;
+                }
+
+                // 等待主程序进程退出。Launcher 作为后台守护进程保持运行，
+                // 维持 IPC 管道服务端供主程序报告启动进度。
+                if (hostProcess is not null)
+                {
+                    var processExitTask = hostProcess.WaitForExitAsync();
+                    
+                    // 等待主程序就绪或进程退出（取先发生者）
+                    // 30 秒超时，宿主端有 10 秒兜底机制确保 Ready 信号发送
+                    var readyOrTimeoutOrExit = Task.WhenAny(
+                        hostReadyTcs.Task,
+                        processExitTask,
+                        Task.Delay(TimeSpan.FromSeconds(30)));
+                    
+                    var completedTask = await readyOrTimeoutOrExit;
+                    
+                    // Host process exited before reporting Ready.
+                    if (completedTask == processExitTask)
+                    {
+                        var exitCode = hostProcess.ExitCode;
+                        Console.Error.WriteLine($"[LauncherFlowCoordinator] Host process exited before Ready. ExitCode={exitCode}.");
+
+                        var recoveryResult = await TryRecoverFromEarlyHostExitAsync(
+                            exitCode,
+                            hostReadyTcs,
+                            splashWindow,
+                            loadingDetailsWindow).ConfigureAwait(false);
+                        if (recoveryResult is not null)
+                        {
+                            return recoveryResult;
+                        }
+
+                        // Close Splash window for unrecoverable early exits.
+                        await Dispatcher.UIThread.InvokeAsync(() =>
+                        {
+                            try
+                            {
+                                if (splashWindow.IsVisible && splashWindow.IsLoaded)
+                                {
+                                    splashWindow.Close();
+                                }
+                            }
+                            catch (Exception ex)
+                            {
+                                Console.Error.WriteLine($"[LauncherFlowCoordinator] Error closing splash window: {ex.Message}");
+                            }
+                        });
+                            
+                        return new LauncherResult
+                        {
+                            Success = false,
+                            Stage = "launch",
+                            Code = "host_crashed",
+                            Message = $"主程序异常退出，退出代码: {exitCode}"
+                        };
+                    }
+                    
+                    // 如果 Splash 窗口仍然打开（超时情况），关闭它
+                    if (splashWindow.IsVisible)
+                    {
+                        Console.WriteLine("[LauncherFlowCoordinator] Timeout waiting for Ready signal, closing splash window...");
+                        await Dispatcher.UIThread.InvokeAsync(() =>
+                        {
+                            try
+                            {
+                                if (splashWindow.IsVisible && splashWindow.IsLoaded)
+                                {
+                                    splashWindow.Close();
+                                }
+                            }
+                            catch (Exception ex)
+                            {
+                                Console.Error.WriteLine($"[LauncherFlowCoordinator] Error closing splash window on timeout: {ex.Message}");
+                            }
+                        });
+                    }
+                    
+                    // 继续等待主程序进程退出（如果它还在运行）
+                    if (!hostProcess.HasExited)
+                    {
+                        await processExitTask;
+                    }
+                }
+                else
+                {
+                    // 如果无法获取进程引用，退回到有限等待
+                    await Task.Delay(TimeSpan.FromSeconds(30));
+                }
+
+                return new LauncherResult
+                {
+                    Success = true,
+                    Stage = "exit",
+                    Code = "ok",
+                    Message = "Launcher completed successfully."
+                };
+            }
+            finally
+            {
+                // Splash 窗口可能已由 IPC Ready 回调关闭，这里做安全清理
+                await Dispatcher.UIThread.InvokeAsync(() =>
+                {
+                    try
+                    {
+                        if (splashWindow.IsVisible && splashWindow.IsLoaded)
+                        {
+                            splashWindow.Close();
+                            Console.WriteLine("[LauncherFlowCoordinator] Splash window closed in finally block");
+                        }
+                    }
+                    catch (Exception ex)
+                    {
+                        Console.Error.WriteLine($"[LauncherFlowCoordinator] Error closing splash window in finally: {ex.Message}");
+                    }
+                });
+            }
+        }
+        catch (Exception ex)
+        {
+            return new LauncherResult
+            {
+                Success = false,
+                Stage = "launch",
+                Code = "exception",
+                Message = ex.Message,
+                ErrorMessage = ex.ToString()
+            };
+        }
+    }
+
+    private async Task<LauncherResult?> TryRecoverFromEarlyHostExitAsync(
+        int exitCode,
+        TaskCompletionSource hostReadyTcs,
+        SplashWindow splashWindow,
+        LoadingDetailsWindow? loadingDetailsWindow)
+    {
+        if (exitCode == HostExitCodes.SecondaryActivationSucceeded)
+        {
+            Console.WriteLine("[LauncherFlowCoordinator] Host redirected activation to an existing primary instance.");
+            await CloseWindowsAsync(splashWindow, loadingDetailsWindow).ConfigureAwait(false);
+            return new LauncherResult
+            {
+                Success = true,
+                Stage = "launch",
+                Code = "activated_existing_instance",
+                Message = "Detected existing running instance and activation was acknowledged."
+            };
+        }
+
+        if (exitCode is not HostExitCodes.SecondaryActivationFailed and not HostExitCodes.RestartLockNotAcquired)
+        {
+            return null;
+        }
+
+        Console.Error.WriteLine(
+            $"[LauncherFlowCoordinator] Activation handshake failed with exit code {exitCode}. Retrying explicit activation once...");
+
+        var (retryLaunchResult, retryProcess) = await LaunchHostWithIpcAsync(splashWindow).ConfigureAwait(false);
+        if (!retryLaunchResult.Success)
+        {
+            return retryLaunchResult;
+        }
+
+        if (retryProcess is null)
+        {
+            return new LauncherResult
+            {
+                Success = false,
+                Stage = "launch",
+                Code = "activation_retry_start_failed",
+                Message = "Explicit activation retry failed because no host process was created."
+            };
+        }
+
+        Console.WriteLine($"[LauncherFlowCoordinator] Explicit activation retry started. RetryPid={retryProcess.Id}.");
+        var retryExitTask = retryProcess.WaitForExitAsync();
+        var retryCompleted = await Task.WhenAny(
+            hostReadyTcs.Task,
+            retryExitTask,
+            Task.Delay(TimeSpan.FromSeconds(15))).ConfigureAwait(false);
+
+        if (retryCompleted == hostReadyTcs.Task)
+        {
+            Console.WriteLine("[LauncherFlowCoordinator] Host reported Ready after explicit activation retry.");
+            await CloseWindowsAsync(splashWindow, loadingDetailsWindow).ConfigureAwait(false);
+            return new LauncherResult
+            {
+                Success = true,
+                Stage = "launch",
+                Code = "activation_retry_ready",
+                Message = "Explicit activation retry succeeded and host reported Ready."
+            };
+        }
+
+        if (retryCompleted == retryExitTask)
+        {
+            var retryExitCode = retryProcess.ExitCode;
+            if (retryExitCode == HostExitCodes.SecondaryActivationSucceeded)
+            {
+                await CloseWindowsAsync(splashWindow, loadingDetailsWindow).ConfigureAwait(false);
+                return new LauncherResult
+                {
+                    Success = true,
+                    Stage = "launch",
+                    Code = "activation_retry_redirected",
+                    Message = "Explicit activation retry redirected to the existing primary instance."
+                };
+            }
+
+            return new LauncherResult
+            {
+                Success = false,
+                Stage = "launch",
+                Code = "activation_retry_failed",
+                Message = $"Explicit activation retry failed. ExitCode={retryExitCode}. 请结束残留后台进程后重试。"
+            };
+        }
+
+        return new LauncherResult
+        {
+            Success = false,
+            Stage = "launch",
+            Code = "activation_retry_timeout",
+            Message = "Explicit activation retry timed out before host became ready. 请结束残留后台进程后重试。"
+        };
+    }
+
+    private static async Task CloseWindowsAsync(SplashWindow splashWindow, LoadingDetailsWindow? loadingDetailsWindow)
+    {
+        await Dispatcher.UIThread.InvokeAsync(() =>
+        {
+            try
+            {
+                if (splashWindow.IsVisible && splashWindow.IsLoaded)
+                {
+                    splashWindow.Close();
+                }
+            }
+            catch (Exception ex)
+            {
+                Console.Error.WriteLine($"[LauncherFlowCoordinator] Failed to close splash window: {ex.Message}");
+            }
+
+            try
+            {
+                if (loadingDetailsWindow is not null && loadingDetailsWindow.IsVisible)
+                {
+                    loadingDetailsWindow.Close();
+                }
+            }
+            catch (Exception ex)
+            {
+                Console.Error.WriteLine($"[LauncherFlowCoordinator] Failed to close loading details window: {ex.Message}");
+            }
+        });
+    }
+
+    private async Task<(LauncherResult Result, Process? Process)> LaunchHostWithIpcAsync(SplashWindow? splashWindow = null, string? customHostPath = null)
+    {
+        // 优先使用自定义路径（调试模式选择的路径）
+        var hostPath = customHostPath ?? _deploymentLocator.ResolveHostExecutablePath();
+        
+        if (string.IsNullOrWhiteSpace(hostPath))
+        {
+            // 关闭 Splash 窗口
+            // 显示错误窗口而不是直接退出
+            var (errorResult, selectedPath) = await ShowHostNotFoundErrorAsync();
+            
+            if (errorResult == ErrorWindowResult.Retry)
+            {
+                // 用户选择重试，如果有选择路径则使用，否则重新尝试
+                if (!string.IsNullOrWhiteSpace(selectedPath))
+                {
+                    return await LaunchHostWithIpcAsync(splashWindow, selectedPath);
+                }
+                return await LaunchHostWithIpcAsync(splashWindow);
+            }
+            
+            // 用户选择退出
+            return (new LauncherResult
+            {
+                Success = false,
+                Stage = "launchHost",
+                Code = "host_not_found",
+                Message = "LanMountainDesktop host executable not found."
+            }, null);
+        }
+
+        if (OperatingSystem.IsLinux() || OperatingSystem.IsMacOS())
+        {
+            EnsureExecutable(hostPath);
+        }
+
+        var hostWorkingDir = Path.GetDirectoryName(hostPath) ?? _deploymentLocator.GetAppRoot();
+        var versionInfo = _deploymentLocator.GetVersionInfo();
+
+        // 构建命令行参数：转发用户参数 + IPC 环境信息通过命令行传递
+        // UseShellExecute = true 确保 Shell 启动子进程，使其正确关联到交互式桌面窗口站(WinSta0)，
+        // 避免子进程窗口创建成功但不可见的问题。
+        var arguments = new System.Text.StringBuilder();
+
+        // 转发命令行参数给主程序（排除 Launcher 自己的命令和选项）
+        // 只过滤 Launcher 专属的选项，保留宿主程序需要的参数（如 --restart-parent-pid）
+        foreach (var arg in _context.RawArgs)
+        {
+            if (arg == _context.Command || arg == _context.SubCommand)
+                continue;
+            
+            if (arg.StartsWith("--"))
+            {
+                var key = arg[2..];
+                var equalsIndex = key.IndexOf('=');
+                if (equalsIndex >= 0) key = key[..equalsIndex];
+                
+                if (LauncherOnlyOptions.Contains(key, StringComparer.OrdinalIgnoreCase))
+                    continue;
+            }
+            
+            if (arguments.Length > 0) arguments.Append(' ');
+            arguments.Append(QuoteArgument(arg));
+        }
+
+        // 通过命令行参数传递 IPC 连接信息（UseShellExecute=true 时不支持 EnvironmentVariables）
+        if (arguments.Length > 0) arguments.Append(' ');
+        arguments.Append($"--{LauncherIpcConstants.LauncherPidEnvVar}={Environment.ProcessId}");
+        arguments.Append($" --{LauncherIpcConstants.PackageRootEnvVar}={QuoteArgument(_deploymentLocator.GetAppRoot())}");
+        arguments.Append($" --{LauncherIpcConstants.VersionEnvVar}={versionInfo.Version}");
+        arguments.Append($" --{LauncherIpcConstants.CodenameEnvVar}={versionInfo.Codename}");
+
+        var processStartInfo = new ProcessStartInfo
+        {
+            FileName = hostPath,
+            UseShellExecute = true,
+            WorkingDirectory = hostWorkingDir,
+            Arguments = arguments.ToString()
+        };
+
+        // 同时设置环境变量作为备选（当 UseShellExecute=true 时 EnvironmentVariables 仍会被子进程继承）
+        processStartInfo.EnvironmentVariables[LauncherIpcConstants.LauncherPidEnvVar] = 
+            Environment.ProcessId.ToString();
+        processStartInfo.EnvironmentVariables[LauncherIpcConstants.PackageRootEnvVar] = 
+            _deploymentLocator.GetAppRoot();
+        processStartInfo.EnvironmentVariables[LauncherIpcConstants.VersionEnvVar] = versionInfo.Version;
+        processStartInfo.EnvironmentVariables[LauncherIpcConstants.CodenameEnvVar] = versionInfo.Codename;
+
+        var hostProcess = Process.Start(processStartInfo);
+        Console.WriteLine(
+            $"[LauncherFlowCoordinator] Host launch requested. Path='{hostPath}'; WorkingDir='{hostWorkingDir}'; " +
+            $"Pid={(hostProcess is null ? -1 : hostProcess.Id)}; Args='{processStartInfo.Arguments}'.");
+        return (new LauncherResult
+        {
+            Success = true,
+            Stage = "launchHost",
+            Code = "ok",
+            Message = "Host launched."
+        }, hostProcess);
+    }
+
+    /// <summary>
+    /// 显示找不到主程序的错误窗口
+    /// </summary>
+    private async Task<(ErrorWindowResult Result, string? CustomPath)> ShowHostNotFoundErrorAsync()
+    {
+        ErrorWindow? errorWindow = null;
+        
+        // 在 UI 线程创建并显示错误窗口
+        await Dispatcher.UIThread.InvokeAsync(() =>
+        {
+            try
+            {
+                errorWindow = new ErrorWindow();
+                errorWindow.SetErrorMessage("找不到阑山桌面应用程序。");
+                errorWindow.Show();
+                Console.WriteLine("[LauncherFlowCoordinator] ErrorWindow shown for host not found");
+            }
+            catch (Exception ex)
+            {
+                Console.Error.WriteLine($"[LauncherFlowCoordinator] Failed to show ErrorWindow: {ex.Message}");
+            }
+        });
+        
+        if (errorWindow is null)
+        {
+            Console.Error.WriteLine("[LauncherFlowCoordinator] ErrorWindow is null, cannot wait for choice");
+            return (ErrorWindowResult.Exit, null);
+        }
+        
+        // 等待用户选择
+        ErrorWindowResult result;
+        string? customPath;
+        
+        try
+        {
+            result = await errorWindow.WaitForChoiceAsync();
+            customPath = errorWindow.GetCustomHostPath();
+            Console.WriteLine($"[LauncherFlowCoordinator] ErrorWindow result: {result}, customPath: {customPath != null}");
+        }
+        catch (Exception ex)
+        {
+            Console.Error.WriteLine($"[LauncherFlowCoordinator] Error waiting for choice: {ex.Message}");
+            result = ErrorWindowResult.Exit;
+            customPath = null;
+        }
+        
+        // 安全关闭错误窗口
+        await Dispatcher.UIThread.InvokeAsync(() =>
+        {
+            try
+            {
+                if (errorWindow.IsVisible && errorWindow.IsLoaded)
+                {
+                    errorWindow.Close();
+                    Console.WriteLine("[LauncherFlowCoordinator] ErrorWindow closed successfully");
+                }
+            }
+            catch (Exception ex)
+            {
+                Console.Error.WriteLine($"[LauncherFlowCoordinator] Error closing ErrorWindow: {ex.Message}");
+            }
+        });
+        
+        return (result, customPath);
+    }
+
+    /// <summary>
+    /// 显示迁移提示窗口
+    /// </summary>
+    private async Task<MigrationResult> ShowMigrationPromptAsync(LegacyVersionInfo legacyInfo)
+    {
+        MigrationPromptWindow? migrationWindow = null;
+
+        // 在 UI 线程创建并显示迁移提示窗口
+        await Dispatcher.UIThread.InvokeAsync(() =>
+        {
+            try
+            {
+                migrationWindow = new MigrationPromptWindow();
+                migrationWindow.SetLegacyInfo(legacyInfo);
+                migrationWindow.Show();
+                Console.WriteLine("[LauncherFlowCoordinator] MigrationPromptWindow shown");
+            }
+            catch (Exception ex)
+            {
+                Console.Error.WriteLine($"[LauncherFlowCoordinator] Failed to show MigrationPromptWindow: {ex.Message}");
+            }
+        });
+
+        if (migrationWindow is null)
+        {
+            Console.Error.WriteLine("[LauncherFlowCoordinator] MigrationPromptWindow is null, skipping migration prompt");
+            return MigrationResult.Skipped;
+        }
+
+        // 等待用户选择
+        MigrationResult result;
+
+        try
+        {
+            result = await migrationWindow.WaitForChoiceAsync();
+            Console.WriteLine($"[LauncherFlowCoordinator] MigrationPromptWindow result: {result}");
+        }
+        catch (Exception ex)
+        {
+            Console.Error.WriteLine($"[LauncherFlowCoordinator] Error waiting for migration choice: {ex.Message}");
+            result = MigrationResult.Skipped;
+        }
+
+        // 安全关闭窗口
+        await Dispatcher.UIThread.InvokeAsync(() =>
+        {
+            try
+            {
+                if (migrationWindow.IsVisible && migrationWindow.IsLoaded)
+                {
+                    migrationWindow.Close();
+                    Console.WriteLine("[LauncherFlowCoordinator] MigrationPromptWindow closed successfully");
+                }
+            }
+            catch (Exception ex)
+            {
+                Console.Error.WriteLine($"[LauncherFlowCoordinator] Error closing MigrationPromptWindow: {ex.Message}");
+            }
+        });
+
+        return result;
+    }
+
+    private static string QuoteArgument(string value)
+    {
+        if (string.IsNullOrEmpty(value))
+        {
+            return "\"\"";
+        }
+
+        if (!value.Contains('"') && !value.Contains(' ') && !value.Contains('\t'))
+        {
+            return value;
+        }
+
+        var builder = new System.Text.StringBuilder();
+        builder.Append('"');
+        foreach (var ch in value)
+        {
+            if (ch == '"')
+            {
+                builder.Append("\\\"");
+            }
+            else
+            {
+                builder.Append(ch);
+            }
+        }
+
+        builder.Append('"');
+        return builder.ToString();
+    }
+
+    private static void EnsureExecutable(string path)
+    {
+        if (OperatingSystem.IsWindows())
+        {
+            return;
+        }
+
+        try
+        {
+            var mode = File.GetUnixFileMode(path);
+            mode |= UnixFileMode.UserExecute | UnixFileMode.GroupExecute | UnixFileMode.OtherExecute;
+            File.SetUnixFileMode(path, mode);
+        }
+        catch
+        {
+        }
+    }
+
+    private sealed class WelcomeOobeStep : IOobeStep
+    {
+        private readonly OobeStateService _stateService;
+
+        public WelcomeOobeStep(OobeStateService stateService)
+        {
+            _stateService = stateService;
+        }
+
+        public async Task RunAsync(CancellationToken cancellationToken)
+        {
+            OobeWindow? window = null;
+            
+            try
+            {
+                window = await Dispatcher.UIThread.InvokeAsync(() =>
+                {
+                    try
+                    {
+                        var oobeWindow = new OobeWindow();
+                        oobeWindow.Show();
+                        Console.WriteLine("[WelcomeOobeStep] OOBE window shown");
+                        return oobeWindow;
+                    }
+                    catch (Exception ex)
+                    {
+                        Console.Error.WriteLine($"[WelcomeOobeStep] Failed to show OOBE window: {ex.Message}");
+                        return null;
+                    }
+                });
+
+                if (window is null)
+                {
+                    Console.Error.WriteLine("[WelcomeOobeStep] OOBE window is null, skipping OOBE");
+                    _stateService.MarkCompleted();
+                    return;
+                }
+
+                using var _ = cancellationToken.Register(() =>
+                {
+                    try
+                    {
+                        if (window.IsVisible && window.IsLoaded)
+                        {
+                            window.Close();
+                        }
+                    }
+                    catch (Exception ex)
+                    {
+                        Console.Error.WriteLine($"[WelcomeOobeStep] Error closing OOBE window on cancel: {ex.Message}");
+                    }
+                });
+                
+                await window.WaitForEnterAsync().ConfigureAwait(false);
+                Console.WriteLine("[WelcomeOobeStep] OOBE completed by user");
+                _stateService.MarkCompleted();
+            }
+            finally
+            {
+                if (window is not null)
+                {
+                    await Dispatcher.UIThread.InvokeAsync(() =>
+                    {
+                        try
+                        {
+                            if (window.IsVisible && window.IsLoaded)
+                            {
+                                window.Close();
+                                Console.WriteLine("[WelcomeOobeStep] OOBE window closed in finally");
+                            }
+                        }
+                        catch (Exception ex)
+                        {
+                            Console.Error.WriteLine($"[WelcomeOobeStep] Error closing OOBE window in finally: {ex.Message}");
+                        }
+                    });
+                }
+            }
+        }
+    }
+}

LanMountainDesktop.Launcher/Services/LegacyVersionDetector.cs

@@ -0,0 +1,341 @@
+using System.Diagnostics;
+using Microsoft.Win32;
+
+namespace LanMountainDesktop.Launcher.Services;
+
+/// <summary>
+/// 老版本检测器 - 检测 0.8.x 及更早的单应用模式安装
+/// </summary>
+internal sealed class LegacyVersionDetector
+{
+    private const string LegacyAppName = "LanMountainDesktop";
+    private const string LegacyExeName = "LanMountainDesktop.exe";
+
+    /// <summary>
+    /// 检测是否存在老版本安装
+    /// </summary>
+    public static LegacyVersionInfo? DetectLegacyInstallation()
+    {
+        // 1. 检查注册表（安装版）
+        var registryInfo = DetectFromRegistry();
+        if (registryInfo != null)
+        {
+            return registryInfo;
+        }
+
+        // 2. 检查常见安装目录
+        var commonPaths = DetectFromCommonPaths();
+        if (commonPaths != null)
+        {
+            return commonPaths;
+        }
+
+        // 3. 检查便携版位置
+        var portableInfo = DetectPortableInstallation();
+        if (portableInfo != null)
+        {
+            return portableInfo;
+        }
+
+        return null;
+    }
+
+    /// <summary>
+    /// 从注册表检测安装信息
+    /// </summary>
+    private static LegacyVersionInfo? DetectFromRegistry()
+    {
+        try
+        {
+            // 检查 HKLM\Software\Microsoft\Windows\CurrentVersion\Uninstall
+            using var key = Registry.LocalMachine.OpenSubKey(
+                @$"Software\Microsoft\Windows\CurrentVersion\Uninstall\{LegacyAppName}");
+            
+            if (key != null)
+            {
+                var installLocation = key.GetValue("InstallLocation") as string;
+                var displayVersion = key.GetValue("DisplayVersion") as string;
+                var uninstallString = key.GetValue("UninstallString") as string;
+
+                if (!string.IsNullOrWhiteSpace(installLocation) && 
+                    File.Exists(Path.Combine(installLocation, LegacyExeName)))
+                {
+                    return new LegacyVersionInfo
+                    {
+                        Version = displayVersion ?? "0.8.x",
+                        InstallPath = installLocation,
+                        UninstallCommand = uninstallString,
+                        InstallType = LegacyInstallType.Registry
+                    };
+                }
+            }
+
+            // 检查 HKCU（用户级安装）
+            using var userKey = Registry.CurrentUser.OpenSubKey(
+                @$"Software\Microsoft\Windows\CurrentVersion\Uninstall\{LegacyAppName}");
+            
+            if (userKey != null)
+            {
+                var installLocation = userKey.GetValue("InstallLocation") as string;
+                var displayVersion = userKey.GetValue("DisplayVersion") as string;
+                var uninstallString = userKey.GetValue("UninstallString") as string;
+
+                if (!string.IsNullOrWhiteSpace(installLocation) && 
+                    File.Exists(Path.Combine(installLocation, LegacyExeName)))
+                {
+                    return new LegacyVersionInfo
+                    {
+                        Version = displayVersion ?? "0.8.x",
+                        InstallPath = installLocation,
+                        UninstallCommand = uninstallString,
+                        InstallType = LegacyInstallType.Registry
+                    };
+                }
+            }
+        }
+        catch (Exception ex)
+        {
+            Console.WriteLine($"[LegacyVersionDetector] Registry detection failed: {ex.Message}");
+        }
+
+        return null;
+    }
+
+    /// <summary>
+    /// 从常见安装路径检测
+    /// </summary>
+    private static LegacyVersionInfo? DetectFromCommonPaths()
+    {
+        var commonPaths = new[]
+        {
+            Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.ProgramFiles), LegacyAppName),
+            Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.ProgramFilesX86), LegacyAppName),
+            Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.LocalApplicationData), LegacyAppName),
+            Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.ApplicationData), LegacyAppName),
+        };
+
+        foreach (var path in commonPaths)
+        {
+            try
+            {
+                if (Directory.Exists(path))
+                {
+                    // 检查是否存在老版本的特征文件（没有 app-* 目录）
+                    var exePath = Path.Combine(path, LegacyExeName);
+                    var hasAppDirs = Directory.GetDirectories(path, "app-*").Length > 0;
+
+                    if (File.Exists(exePath) && !hasAppDirs)
+                    {
+                        // 尝试读取版本信息
+                        var version = TryGetFileVersion(exePath);
+                        
+                        return new LegacyVersionInfo
+                        {
+                            Version = version ?? "0.8.x",
+                            InstallPath = path,
+                            UninstallCommand = FindUninstaller(path),
+                            InstallType = LegacyInstallType.CommonPath
+                        };
+                    }
+                }
+            }
+            catch (Exception ex)
+            {
+                Console.WriteLine($"[LegacyVersionDetector] Path detection failed for {path}: {ex.Message}");
+            }
+        }
+
+        return null;
+    }
+
+    /// <summary>
+    /// 检测便携版安装
+    /// </summary>
+    private static LegacyVersionInfo? DetectPortableInstallation()
+    {
+        try
+        {
+            // 检查启动器所在目录的父目录（便携版常见布局）
+            var launcherDir = AppContext.BaseDirectory;
+            var parentDir = Path.GetFullPath(Path.Combine(launcherDir, ".."));
+
+            if (Directory.Exists(parentDir))
+            {
+                var exePath = Path.Combine(parentDir, LegacyExeName);
+                var hasAppDirs = Directory.GetDirectories(parentDir, "app-*").Length > 0;
+
+                // 如果存在 exe 且没有 app-* 目录，可能是老版本
+                if (File.Exists(exePath) && !hasAppDirs)
+                {
+                    var version = TryGetFileVersion(exePath);
+                    
+                    // 检查是否真的是老版本（通过文件版本或特定标记）
+                    if (IsLegacyVersion(version))
+                    {
+                        return new LegacyVersionInfo
+                        {
+                            Version = version ?? "0.8.x",
+                            InstallPath = parentDir,
+                            UninstallCommand = null, // 便携版没有卸载程序
+                            InstallType = LegacyInstallType.Portable
+                        };
+                    }
+                }
+            }
+        }
+        catch (Exception ex)
+        {
+            Console.WriteLine($"[LegacyVersionDetector] Portable detection failed: {ex.Message}");
+        }
+
+        return null;
+    }
+
+    /// <summary>
+    /// 查找卸载程序
+    /// </summary>
+    private static string? FindUninstaller(string installPath)
+    {
+        try
+        {
+            // 常见的卸载程序命名
+            var uninstallerNames = new[] { "unins000.exe", "uninstall.exe", "Uninstall.exe" };
+            
+            foreach (var name in uninstallerNames)
+            {
+                var path = Path.Combine(installPath, name);
+                if (File.Exists(path))
+                {
+                    return path;
+                }
+            }
+        }
+        catch { }
+
+        return null;
+    }
+
+    /// <summary>
+    /// 获取文件版本
+    /// </summary>
+    private static string? TryGetFileVersion(string filePath)
+    {
+        try
+        {
+            var versionInfo = FileVersionInfo.GetVersionInfo(filePath);
+            return versionInfo.FileVersion;
+        }
+        catch
+        {
+            return null;
+        }
+    }
+
+    /// <summary>
+    /// 判断是否为老版本（版本号 < 1.0.0）
+    /// </summary>
+    private static bool IsLegacyVersion(string? version)
+    {
+        if (string.IsNullOrWhiteSpace(version))
+        {
+            return true; // 无法确定版本时，保守认为是老版本
+        }
+
+        if (Version.TryParse(version.Split(' ')[0], out var v))
+        {
+            return v.Major < 1;
+        }
+
+        return true;
+    }
+
+    /// <summary>
+    /// 打开卸载界面
+    /// </summary>
+    public static void OpenUninstallInterface(LegacyVersionInfo info)
+    {
+        try
+        {
+            if (!string.IsNullOrWhiteSpace(info.UninstallCommand))
+            {
+                // 有卸载命令，直接执行
+                var parts = info.UninstallCommand.Split(new[] { ' ' }, 2);
+                var fileName = parts[0].Trim('"');
+                var arguments = parts.Length > 1 ? parts[1] : "";
+
+                Process.Start(new ProcessStartInfo
+                {
+                    FileName = fileName,
+                    Arguments = arguments,
+                    UseShellExecute = true,
+                    Verb = "runas" // 请求管理员权限
+                });
+            }
+            else
+            {
+                // 没有卸载命令，打开系统卸载面板
+                Process.Start(new ProcessStartInfo
+                {
+                    FileName = "appwiz.cpl",
+                    UseShellExecute = true
+                });
+            }
+        }
+        catch (Exception ex)
+        {
+            Console.Error.WriteLine($"[LegacyVersionDetector] Failed to open uninstall: {ex.Message}");
+            
+            // 兜底：打开系统卸载面板
+            try
+            {
+                Process.Start(new ProcessStartInfo
+                {
+                    FileName = "appwiz.cpl",
+                    UseShellExecute = true
+                });
+            }
+            catch { }
+        }
+    }
+
+    /// <summary>
+    /// 在资源管理器中显示老版本位置
+    /// </summary>
+    public static void ShowInExplorer(string path)
+    {
+        try
+        {
+            Process.Start(new ProcessStartInfo
+            {
+                FileName = "explorer.exe",
+                Arguments = $"/select,\"{path}\"",
+                UseShellExecute = false
+            });
+        }
+        catch (Exception ex)
+        {
+            Console.Error.WriteLine($"[LegacyVersionDetector] Failed to show in explorer: {ex.Message}");
+        }
+    }
+}
+
+/// <summary>
+/// 老版本信息
+/// </summary>
+public class LegacyVersionInfo
+{
+    public string Version { get; set; } = "0.8.x";
+    public string InstallPath { get; set; } = "";
+    public string? UninstallCommand { get; set; }
+    public LegacyInstallType InstallType { get; set; }
+}
+
+/// <summary>
+/// 老版本安装类型
+/// </summary>
+public enum LegacyInstallType
+{
+    Registry,    // 注册表安装版
+    CommonPath,  // 常见路径安装
+    Portable     // 便携版
+}

LanMountainDesktop.Launcher/Services/Logger.cs

@@ -0,0 +1,138 @@
+using System.Text;
+
+namespace LanMountainDesktop.Launcher.Services;
+
+/// <summary>
+/// 简单的日志记录器 - 同时输出到控制台和文件
+/// </summary>
+internal static class Logger
+{
+    private static readonly object _lock = new();
+    private static string? _logFilePath;
+    private static bool _initialized;
+
+    /// <summary>
+    /// 初始化日志记录器
+    /// </summary>
+    public static void Initialize()
+    {
+        if (_initialized)
+        {
+            return;
+        }
+
+        try
+        {
+            var logDir = GetLogDirectory();
+            if (!string.IsNullOrEmpty(logDir))
+            {
+                Directory.CreateDirectory(logDir);
+                var timestamp = DateTime.Now.ToString("yyyyMMdd_HHmmss");
+                _logFilePath = Path.Combine(logDir, $"launcher_{timestamp}.log");
+                Console.WriteLine($"[Logger] Log file initialized: {_logFilePath}");
+            }
+        }
+        catch (Exception ex)
+        {
+            Console.Error.WriteLine($"[Logger] Failed to initialize log file: {ex.Message}");
+        }
+
+        _initialized = true;
+    }
+
+    /// <summary>
+    /// 获取日志文件路径
+    /// </summary>
+    public static string? GetLogFilePath()
+    {
+        return _logFilePath;
+    }
+
+    /// <summary>
+    /// 获取日志目录
+    /// </summary>
+    private static string? GetLogDirectory()
+    {
+        try
+        {
+            var appData = Environment.GetFolderPath(Environment.SpecialFolder.LocalApplicationData);
+            if (!string.IsNullOrEmpty(appData))
+            {
+                return Path.Combine(appData, "LanMountainDesktop", ".launcher", "logs");
+            }
+        }
+        catch
+        {
+        }
+
+        try
+        {
+            var launcherDir = AppContext.BaseDirectory;
+            return Path.Combine(launcherDir, ".launcher", "logs");
+        }
+        catch
+        {
+        }
+
+        return null;
+    }
+
+    /// <summary>
+    /// 记录信息日志
+    /// </summary>
+    public static void Info(string message)
+    {
+        WriteLog("INFO", message);
+    }
+
+    /// <summary>
+    /// 记录警告日志
+    /// </summary>
+    public static void Warn(string message)
+    {
+        WriteLog("WARN", message);
+    }
+
+    /// <summary>
+    /// 记录错误日志
+    /// </summary>
+    public static void Error(string message)
+    {
+        WriteLog("ERROR", message);
+    }
+
+    /// <summary>
+    /// 记录错误日志（带异常）
+    /// </summary>
+    public static void Error(string message, Exception exception)
+    {
+        WriteLog("ERROR", $"{message}\n{exception}");
+    }
+
+    /// <summary>
+    /// 写入日志
+    /// </summary>
+    private static void WriteLog(string level, string message)
+    {
+        var timestamp = DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss.fff");
+        var logLine = $"[{timestamp}] [{level}] {message}";
+
+        Console.WriteLine(logLine);
+
+        if (string.IsNullOrEmpty(_logFilePath))
+        {
+            return;
+        }
+
+        try
+        {
+            lock (_lock)
+            {
+                File.AppendAllText(_logFilePath, logLine + Environment.NewLine, Encoding.UTF8);
+            }
+        }
+        catch
+        {
+        }
+    }
+}

LanMountainDesktop.Launcher/Services/OobeStateService.cs

@@ -0,0 +1,104 @@
+namespace LanMountainDesktop.Launcher.Services;
+
+internal sealed class OobeStateService
+{
+    private readonly string _markerPath;
+
+    public OobeStateService(string appRoot)
+    {
+        // 优先使用 LocalApplicationData（用户目录，普通用户一定有权限）
+        string? stateDir = null;
+        Exception? lastException = null;
+
+        // 策略1: LocalApplicationData（首选，用户目录，普通用户一定有写权限）
+        try
+        {
+            var appDataDir = Path.Combine(
+                Environment.GetFolderPath(Environment.SpecialFolder.LocalApplicationData),
+                "LanMountainDesktop");
+            stateDir = Path.Combine(appDataDir, ".launcher", "state");
+            Directory.CreateDirectory(stateDir);
+            Console.WriteLine($"[OobeStateService] Using LocalApplicationData: {stateDir}");
+        }
+        catch (Exception ex)
+        {
+            lastException = ex;
+            Console.Error.WriteLine($"[OobeStateService] LocalApplicationData failed: {ex.Message}");
+            stateDir = null;
+        }
+
+        // 策略2: 如果LocalApplicationData不行，使用用户的临时目录
+        if (stateDir == null)
+        {
+            try
+            {
+                var tempDir = Path.Combine(Path.GetTempPath(), "LanMountainDesktop", ".launcher", "state");
+                Directory.CreateDirectory(tempDir);
+                stateDir = tempDir;
+                Console.WriteLine($"[OobeStateService] Using TempPath: {stateDir}");
+            }
+            catch (Exception ex)
+            {
+                lastException = ex;
+                Console.Error.WriteLine($"[OobeStateService] TempPath failed: {ex.Message}");
+                stateDir = null;
+            }
+        }
+
+        // 策略3: 最后的兜底：使用当前用户的应用程序数据目录（和Launcher同目录
+        if (stateDir == null)
+        {
+            try
+            {
+                var launcherDir = AppContext.BaseDirectory;
+                stateDir = Path.Combine(launcherDir, ".launcher", "state");
+                Directory.CreateDirectory(stateDir);
+                Console.WriteLine($"[OobeStateService] Using Launcher directory: {stateDir}");
+            }
+            catch (Exception ex)
+            {
+                lastException = ex;
+                Console.Error.WriteLine($"[OobeStateService] All strategies failed! Last error: {ex.Message}");
+                // 如果所有策略都失败，抛出异常让上层处理
+                throw new InvalidOperationException("无法创建 OOBE 状态存储目录失败", lastException);
+            }
+        }
+
+        _markerPath = Path.Combine(stateDir, "first_run_completed");
+        Console.WriteLine($"[OobeStateService] Initialized successfully, marker path: {_markerPath}");
+    }
+
+    public bool IsFirstRun()
+    {
+        try
+        {
+            return !File.Exists(_markerPath);
+        }
+        catch (Exception ex)
+        {
+            Console.Error.WriteLine($"[OobeStateService] Failed to check first run: {ex.Message}");
+            // 如果无法检查，默认视为首次运行，确保OOBE能显示
+            return true;
+        }
+    }
+
+    public void MarkCompleted()
+    {
+        try
+        {
+            var dir = Path.GetDirectoryName(_markerPath);
+            if (!string.IsNullOrWhiteSpace(dir))
+            {
+                Directory.CreateDirectory(dir);
+            }
+
+            File.WriteAllText(_markerPath, DateTimeOffset.UtcNow.ToString("O"));
+            Console.WriteLine("[OobeStateService] Marked first run as completed");
+        }
+        catch (Exception ex)
+        {
+            Console.Error.WriteLine($"[OobeStateService] Failed to mark completed: {ex.Message}");
+            // 如果无法写入也没关系，下次启动还会显示OOBE
+        }
+    }
+}

LanMountainDesktop.Launcher/Services/PluginInstallerService.cs

@@ -0,0 +1,226 @@
+using System.IO.Compression;
+using System.Text.Json;
+using LanMountainDesktop.Launcher.Models;
+
+namespace LanMountainDesktop.Launcher.Services;
+
+/// <summary>
+/// 插件安装服务 - 简化版，不依赖 PluginSdk
+/// </summary>
+internal sealed class PluginInstallerService
+{
+    private const string ManifestFileName = "manifest.json";
+    private const string PackageFileExtension = ".lmdp";
+    private const string RuntimeDirectoryName = "runtime";
+    
+    private static readonly TimeSpan[] RetryDelays =
+    [
+        TimeSpan.FromMilliseconds(120),
+        TimeSpan.FromMilliseconds(250),
+        TimeSpan.FromMilliseconds(500)
+    ];
+
+    public LauncherResult InstallPackage(string sourcePath, string pluginsDirectory)
+    {
+        var fullSourcePath = Path.GetFullPath(sourcePath);
+        var fullPluginsDirectory = Path.GetFullPath(pluginsDirectory);
+
+        if (!File.Exists(fullSourcePath))
+        {
+            throw new FileNotFoundException($"Plugin package '{fullSourcePath}' was not found.", fullSourcePath);
+        }
+
+        var manifest = ReadManifestFromPackage(fullSourcePath);
+        Directory.CreateDirectory(fullPluginsDirectory);
+        var destinationPath = Path.Combine(fullPluginsDirectory, BuildInstalledPackageFileName(manifest.Id));
+        var stagingPath = destinationPath + ".incoming";
+        DeleteFileWithRetry(stagingPath);
+        CopyWithRetry(fullSourcePath, stagingPath, overwrite: true);
+        RemoveExistingPluginPackages(fullPluginsDirectory, manifest.Id, destinationPath, stagingPath);
+        MoveWithOverwriteRetry(stagingPath, destinationPath);
+
+        return new LauncherResult
+        {
+            Success = true,
+            Stage = "plugin.install",
+            Code = "ok",
+            Message = "Plugin installed.",
+            InstalledPackagePath = destinationPath,
+            ManifestId = manifest.Id,
+            ManifestName = manifest.Name
+        };
+    }
+
+    public PluginManifest ReadManifestFromPackage(string packagePath)
+    {
+        using var archive = ZipFile.OpenRead(packagePath);
+        var entries = archive.Entries
+            .Where(entry => string.Equals(entry.Name, ManifestFileName, StringComparison.OrdinalIgnoreCase))
+            .ToArray();
+
+        if (entries.Length == 0)
+        {
+            throw new InvalidOperationException(
+                $"Plugin package '{packagePath}' does not contain '{ManifestFileName}'.");
+        }
+
+        if (entries.Length > 1)
+        {
+            throw new InvalidOperationException(
+                $"Plugin package '{packagePath}' contains multiple '{ManifestFileName}' files.");
+        }
+
+        using var stream = entries[0].Open();
+        using var reader = new StreamReader(stream);
+        var json = reader.ReadToEnd();
+        var manifest = JsonSerializer.Deserialize(json, AppJsonContext.Default.PluginManifest);
+        if (manifest == null)
+        {
+            throw new InvalidOperationException($"Failed to deserialize manifest from '{packagePath}'.");
+        }
+        return manifest;
+    }
+
+    private void RemoveExistingPluginPackages(string pluginsDirectory, string pluginId, string destinationPath, string stagingPath)
+    {
+        var runtimeRootDirectory = EnsureTrailingSeparator(Path.Combine(Path.GetFullPath(pluginsDirectory), RuntimeDirectoryName));
+        var pendingDeletionDir = Path.Combine(pluginsDirectory, ".pending-deletions");
+        Directory.CreateDirectory(pendingDeletionDir);
+
+        foreach (var existingPackagePath in Directory
+                     .EnumerateFiles(pluginsDirectory, "*" + PackageFileExtension, SearchOption.AllDirectories)
+                     .Select(Path.GetFullPath)
+                     .Where(path => !path.StartsWith(runtimeRootDirectory, StringComparison.OrdinalIgnoreCase)))
+        {
+            try
+            {
+                if (string.Equals(existingPackagePath, Path.GetFullPath(destinationPath), StringComparison.OrdinalIgnoreCase) ||
+                    string.Equals(existingPackagePath, Path.GetFullPath(stagingPath), StringComparison.OrdinalIgnoreCase))
+                {
+                    continue;
+                }
+
+                var existingManifest = ReadManifestFromPackage(existingPackagePath);
+                if (!string.Equals(existingManifest.Id, pluginId, StringComparison.OrdinalIgnoreCase))
+                {
+                    continue;
+                }
+
+                TryRemoveExistingPackage(existingPackagePath, pendingDeletionDir);
+            }
+            catch
+            {
+            }
+        }
+
+        CleanupPendingDeletions(pendingDeletionDir);
+    }
+
+    private void TryRemoveExistingPackage(string existingPackagePath, string pendingDeletionDir)
+    {
+        try
+        {
+            DeleteFileWithRetry(existingPackagePath);
+        }
+        catch (IOException)
+        {
+            var fileName = Path.GetFileName(existingPackagePath);
+            var pendingPath = Path.Combine(pendingDeletionDir, $"{fileName}.{Guid.NewGuid():N}.pending");
+            File.Move(existingPackagePath, pendingPath);
+        }
+    }
+
+    private static void CleanupPendingDeletions(string pendingDeletionDir)
+    {
+        if (!Directory.Exists(pendingDeletionDir))
+        {
+            return;
+        }
+
+        foreach (var pendingFile in Directory.EnumerateFiles(pendingDeletionDir, "*.pending"))
+        {
+            try
+            {
+                File.Delete(pendingFile);
+            }
+            catch
+            {
+            }
+        }
+    }
+
+    private static void CopyWithRetry(string sourcePath, string destinationPath, bool overwrite)
+    {
+        Retry(() => File.Copy(sourcePath, destinationPath, overwrite));
+    }
+
+    private static void MoveWithOverwriteRetry(string sourcePath, string destinationPath)
+    {
+        Retry(() => File.Move(sourcePath, destinationPath, overwrite: true));
+    }
+
+    private static void DeleteFileWithRetry(string filePath)
+    {
+        Retry(() =>
+        {
+            if (File.Exists(filePath))
+            {
+                File.Delete(filePath);
+            }
+        });
+    }
+
+    private static void Retry(Action action)
+    {
+        Exception? lastException = null;
+        for (var attempt = 0; attempt <= RetryDelays.Length; attempt++)
+        {
+            try
+            {
+                action();
+                return;
+            }
+            catch (Exception ex) when (ex is IOException or UnauthorizedAccessException)
+            {
+                lastException = ex;
+                if (attempt >= RetryDelays.Length)
+                {
+                    break;
+                }
+
+                Thread.Sleep(RetryDelays[attempt]);
+            }
+        }
+
+        if (lastException is not null)
+        {
+            throw lastException;
+        }
+    }
+
+    private static string BuildInstalledPackageFileName(string pluginId)
+    {
+        var invalidChars = Path.GetInvalidFileNameChars();
+        var fileName = new string(pluginId.Select(ch => invalidChars.Contains(ch) ? '_' : ch).ToArray());
+        return fileName + PackageFileExtension;
+    }
+
+    private static string EnsureTrailingSeparator(string path)
+    {
+        return path.EndsWith(Path.DirectorySeparatorChar.ToString(), StringComparison.Ordinal)
+            ? path
+            : path + Path.DirectorySeparatorChar;
+    }
+}
+
+/// <summary>
+/// 简化的插件清单模型
+/// </summary>
+public class PluginManifest
+{
+    public string Id { get; set; } = "";
+    public string Name { get; set; } = "";
+    public string Version { get; set; } = "";
+    public string? Description { get; set; }
+    public string? Author { get; set; }
+}

LanMountainDesktop.Launcher/Services/PluginUpgradeQueueService.cs

@@ -0,0 +1,94 @@
+using System.Text.Json;
+using LanMountainDesktop.Launcher.Models;
+
+namespace LanMountainDesktop.Launcher.Services;
+
+internal sealed class PluginUpgradeQueueService
+{
+    private const string PendingUpgradesFileName = ".pending-plugin-upgrades.json";
+
+    private readonly PluginInstallerService _installerService;
+
+    public PluginUpgradeQueueService(PluginInstallerService installerService)
+    {
+        _installerService = installerService;
+    }
+
+    public LauncherResult ApplyPendingUpgrades(string pluginsDirectory)
+    {
+        var pendingPath = Path.Combine(pluginsDirectory, PendingUpgradesFileName);
+        if (!File.Exists(pendingPath))
+        {
+            return new LauncherResult
+            {
+                Success = true,
+                Stage = "plugin.update",
+                Code = "noop",
+                Message = "No pending plugin upgrades."
+            };
+        }
+
+        var text = File.ReadAllText(pendingPath);
+        var pending = JsonSerializer.Deserialize(text, AppJsonContext.Default.ListPendingUpgrade) ?? [];
+        var failures = new List<string>();
+        var succeeded = new List<PendingUpgrade>();
+
+        foreach (var item in pending)
+        {
+            if (!item.IsValid())
+            {
+                failures.Add(item.PluginId);
+                continue;
+            }
+
+            try
+            {
+                _installerService.InstallPackage(item.SourcePackagePath, pluginsDirectory);
+                succeeded.Add(item);
+            }
+            catch
+            {
+                failures.Add(item.PluginId);
+            }
+        }
+
+        var remaining = pending
+            .Except(succeeded)
+            .Where(item => failures.Contains(item.PluginId, StringComparer.OrdinalIgnoreCase))
+            .ToList();
+
+        if (remaining.Count == 0)
+        {
+            File.Delete(pendingPath);
+        }
+        else
+        {
+            File.WriteAllText(pendingPath, JsonSerializer.Serialize(remaining, AppJsonContext.Default.ListPendingUpgrade));
+        }
+
+        return new LauncherResult
+        {
+            Success = failures.Count == 0,
+            Stage = "plugin.update",
+            Code = failures.Count == 0 ? "ok" : "partial_failed",
+            Message = failures.Count == 0
+                ? $"Applied {succeeded.Count} pending plugin upgrade(s)."
+                : $"Applied {succeeded.Count} upgrades, failed: {string.Join(", ", failures)}."
+        };
+    }
+}
+
+internal sealed record PendingUpgrade(
+    string PluginId,
+    string SourcePackagePath,
+    string TargetVersion,
+    DateTimeOffset CreatedAt)
+{
+    public bool IsValid()
+    {
+        return !string.IsNullOrWhiteSpace(PluginId) &&
+               !string.IsNullOrWhiteSpace(SourcePackagePath) &&
+               !string.IsNullOrWhiteSpace(TargetVersion) &&
+               File.Exists(SourcePackagePath);
+    }
+}

LanMountainDesktop.Launcher/Services/UpdateCheckService.cs

@@ -0,0 +1,161 @@
+using System.Net.Http;
+using System.Net.Http.Json;
+using System.Text.Json;
+using System.Text.Json.Serialization;
+using LanMountainDesktop.Launcher.Models;
+
+namespace LanMountainDesktop.Launcher.Services;
+
+/// <summary>
+/// 更新检查服务 - 基于 GitHub Release API
+/// </summary>
+internal sealed class UpdateCheckService
+{
+    private const string GitHubApiBase = "https://api.github.com";
+    private readonly string _repoOwner;
+    private readonly string _repoName;
+    private readonly HttpClient _httpClient;
+
+    public UpdateCheckService(string repoOwner, string repoName)
+    {
+        _repoOwner = repoOwner;
+        _repoName = repoName;
+        _httpClient = new HttpClient();
+        _httpClient.DefaultRequestHeaders.Add("User-Agent", "LanMountainDesktop-Launcher");
+        _httpClient.DefaultRequestHeaders.Add("Accept", "application/vnd.github+json");
+    }
+
+    /// <summary>
+    /// 检查更新
+    /// </summary>
+    public async Task<UpdateCheckResult> CheckForUpdateAsync(
+        string currentVersion,
+        UpdateChannel channel,
+        CancellationToken cancellationToken = default)
+    {
+        try
+        {
+            var releases = await FetchReleasesAsync(cancellationToken);
+            
+            // 根据频道过滤版本
+            var filteredReleases = channel == UpdateChannel.Stable
+                ? releases.Where(r => !r.Prerelease).ToList()
+                : releases;
+
+            // 找到最新版本
+            var latestRelease = filteredReleases
+                .OrderByDescending(r => ParseVersion(r.TagName))
+                .FirstOrDefault();
+
+            if (latestRelease == null)
+            {
+                return new UpdateCheckResult
+                {
+                    HasUpdate = false,
+                    CurrentVersion = currentVersion,
+                    ErrorMessage = "No releases found"
+                };
+            }
+
+            var latestVersion = ParseVersionString(latestRelease.TagName);
+            var current = ParseVersion(currentVersion);
+            var latest = ParseVersion(latestVersion);
+
+            return new UpdateCheckResult
+            {
+                HasUpdate = latest > current,
+                LatestVersion = latestVersion,
+                CurrentVersion = currentVersion,
+                Release = latestRelease
+            };
+        }
+        catch (Exception ex)
+        {
+            return new UpdateCheckResult
+            {
+                HasUpdate = false,
+                CurrentVersion = currentVersion,
+                ErrorMessage = ex.Message
+            };
+        }
+    }
+
+    /// <summary>
+    /// 获取所有 Release
+    /// </summary>
+    private async Task<List<ReleaseInfo>> FetchReleasesAsync(CancellationToken cancellationToken)
+    {
+        var url = $"{GitHubApiBase}/repos/{_repoOwner}/{_repoName}/releases";
+        var response = await _httpClient.GetAsync(url, cancellationToken);
+        response.EnsureSuccessStatusCode();
+
+        var json = await response.Content.ReadAsStringAsync(cancellationToken);
+        var releases = JsonSerializer.Deserialize(json, AppJsonContext.Default.ListGitHubRelease);
+
+        return releases?.Select(r => new ReleaseInfo
+        {
+            TagName = r.TagName ?? "",
+            Name = r.Name ?? "",
+            Prerelease = r.Prerelease,
+            PublishedAt = r.PublishedAt,
+            Body = r.Body,
+            Assets = r.Assets?.Select(a => new ReleaseAsset
+            {
+                Name = a.Name ?? "",
+                BrowserDownloadUrl = a.BrowserDownloadUrl ?? "",
+                Size = a.Size
+            }).ToList() ?? []
+        }).ToList() ?? [];
+    }
+
+    /// <summary>
+    /// 从 tag 解析版本号 (例如: v1.0.0 -> 1.0.0)
+    /// </summary>
+    private static string ParseVersionString(string tag)
+    {
+        return tag.TrimStart('v', 'V');
+    }
+
+    /// <summary>
+    /// 解析版本号
+    /// </summary>
+    private static Version ParseVersion(string versionString)
+    {
+        var cleaned = ParseVersionString(versionString);
+        return Version.TryParse(cleaned, out var version) ? version : new Version(0, 0, 0);
+    }
+}
+
+// GitHub API 响应模型
+internal sealed class GitHubRelease
+{
+    [JsonPropertyName("tag_name")]
+    public string? TagName { get; set; }
+
+    [JsonPropertyName("name")]
+    public string? Name { get; set; }
+
+    [JsonPropertyName("prerelease")]
+    public bool Prerelease { get; set; }
+
+    [JsonPropertyName("published_at")]
+    public DateTime PublishedAt { get; set; }
+
+    [JsonPropertyName("body")]
+    public string? Body { get; set; }
+
+    [JsonPropertyName("assets")]
+    public List<GitHubAsset>? Assets { get; set; }
+}
+
+internal sealed class GitHubAsset
+{
+    [JsonPropertyName("name")]
+    public string? Name { get; set; }
+
+    [JsonPropertyName("browser_download_url")]
+    public string? BrowserDownloadUrl { get; set; }
+
+    [JsonPropertyName("size")]
+    public long Size { get; set; }
+}

LanMountainDesktop.Launcher/Services/UpdateEngineService.cs

@@ -0,0 +1,673 @@
+using System.IO.Compression;
+using System.Security.Cryptography;
+using System.Text.Json;
+using LanMountainDesktop.Launcher.Models;
+
+namespace LanMountainDesktop.Launcher.Services;
+
+internal sealed class UpdateEngineService
+{
+    private const string LauncherDirectoryName = ".launcher";
+    private const string UpdateDirectoryName = "update";
+    private const string IncomingDirectoryName = "incoming";
+    private const string SnapshotsDirectoryName = "snapshots";
+    private const string SignedFileMapName = "files.json";
+    private const string SignatureFileName = "files.json.sig";
+    private const string ArchiveFileName = "update.zip";
+    private const string PublicKeyFileName = "public-key.pem";
+
+    private readonly DeploymentLocator _deploymentLocator;
+    private readonly string _appRoot;
+    private readonly string _launcherRoot;
+    private readonly string _incomingRoot;
+    private readonly string _snapshotsRoot;
+
+    public UpdateEngineService(DeploymentLocator deploymentLocator)
+    {
+        _deploymentLocator = deploymentLocator;
+        _appRoot = deploymentLocator.GetAppRoot();
+        _launcherRoot = Path.Combine(_appRoot, LauncherDirectoryName);
+        _incomingRoot = Path.Combine(_launcherRoot, UpdateDirectoryName, IncomingDirectoryName);
+        _snapshotsRoot = Path.Combine(_launcherRoot, SnapshotsDirectoryName);
+    }
+
+    public LauncherResult CheckPendingUpdate()
+    {
+        var fileMapPath = Path.Combine(_incomingRoot, SignedFileMapName);
+        var archivePath = Path.Combine(_incomingRoot, ArchiveFileName);
+        var signaturePath = Path.Combine(_incomingRoot, SignatureFileName);
+        if (!File.Exists(fileMapPath) || !File.Exists(archivePath))
+        {
+            return new LauncherResult
+            {
+                Success = true,
+                Stage = "update.check",
+                Code = "noop",
+                Message = "No pending update."
+            };
+        }
+
+        var fileMapText = File.ReadAllText(fileMapPath);
+        var fileMap = JsonSerializer.Deserialize(fileMapText, AppJsonContext.Default.SignedFileMap);
+        if (fileMap is null)
+        {
+            return Failed("update.check", "invalid_manifest", "files.json is invalid.");
+        }
+
+        var verified = VerifySignature(fileMapPath, signaturePath);
+        if (!verified.Success)
+        {
+            return Failed("update.check", "signature_failed", verified.Message);
+        }
+
+        return new LauncherResult
+        {
+            Success = true,
+            Stage = "update.check",
+            Code = "available",
+            Message = "Pending update is available.",
+            CurrentVersion = _deploymentLocator.GetCurrentVersion(),
+            TargetVersion = fileMap.ToVersion
+        };
+    }
+
+    public async Task<LauncherResult> DownloadAsync(string manifestUrl, string signatureUrl, string archiveUrl, CancellationToken cancellationToken)
+    {
+        Directory.CreateDirectory(_incomingRoot);
+        using var client = new HttpClient
+        {
+            Timeout = TimeSpan.FromMinutes(2)
+        };
+
+        var manifestPath = Path.Combine(_incomingRoot, SignedFileMapName);
+        var signaturePath = Path.Combine(_incomingRoot, SignatureFileName);
+        var archivePath = Path.Combine(_incomingRoot, ArchiveFileName);
+
+        await using (var stream = await client.GetStreamAsync(manifestUrl, cancellationToken).ConfigureAwait(false))
+        await using (var output = File.Create(manifestPath))
+        {
+            await stream.CopyToAsync(output, cancellationToken).ConfigureAwait(false);
+        }
+
+        await using (var stream = await client.GetStreamAsync(signatureUrl, cancellationToken).ConfigureAwait(false))
+        await using (var output = File.Create(signaturePath))
+        {
+            await stream.CopyToAsync(output, cancellationToken).ConfigureAwait(false);
+        }
+
+        await using (var stream = await client.GetStreamAsync(archiveUrl, cancellationToken).ConfigureAwait(false))
+        await using (var output = File.Create(archivePath))
+        {
+            await stream.CopyToAsync(output, cancellationToken).ConfigureAwait(false);
+        }
+
+        return new LauncherResult
+        {
+            Success = true,
+            Stage = "update.download",
+            Code = "ok",
+            Message = "Update downloaded."
+        };
+    }
+
+    public async Task<LauncherResult> ApplyPendingUpdateAsync()
+    {
+        Directory.CreateDirectory(_incomingRoot);
+        Directory.CreateDirectory(_snapshotsRoot);
+
+        var fileMapPath = Path.Combine(_incomingRoot, SignedFileMapName);
+        var signaturePath = Path.Combine(_incomingRoot, SignatureFileName);
+        var archivePath = Path.Combine(_incomingRoot, ArchiveFileName);
+
+        if (!File.Exists(fileMapPath) || !File.Exists(archivePath))
+        {
+            return new LauncherResult
+            {
+                Success = true,
+                Stage = "update.apply",
+                Code = "noop",
+                Message = "No update payload found."
+            };
+        }
+
+        var verifyResult = VerifySignature(fileMapPath, signaturePath);
+        if (!verifyResult.Success)
+        {
+            return Failed("update.apply", "signature_failed", verifyResult.Message);
+        }
+
+        var fileMapText = await File.ReadAllTextAsync(fileMapPath);
+        var fileMap = JsonSerializer.Deserialize(fileMapText, AppJsonContext.Default.SignedFileMap);
+        if (fileMap is null || fileMap.Files.Count == 0)
+        {
+            return Failed("update.apply", "invalid_manifest", "No update file entries were found.");
+        }
+
+        var currentDeployment = _deploymentLocator.FindCurrentDeploymentDirectory();
+        if (string.IsNullOrWhiteSpace(currentDeployment))
+        {
+            // 全新安装场景：没有当前部署目录，但有更新包
+            // 这种情况下应该直接应用更新作为首次安装
+            return await ApplyInitialDeploymentAsync(fileMap, archivePath, fileMapPath, signaturePath);
+        }
+
+        var currentVersion = _deploymentLocator.GetCurrentVersion();
+        if (!string.IsNullOrWhiteSpace(fileMap.FromVersion) &&
+            !string.Equals(fileMap.FromVersion, currentVersion, StringComparison.OrdinalIgnoreCase))
+        {
+            return Failed(
+                "update.apply",
+                "version_mismatch",
+                $"Update requires source version {fileMap.FromVersion} but current is {currentVersion}.");
+        }
+
+        var targetVersion = string.IsNullOrWhiteSpace(fileMap.ToVersion) ? currentVersion : fileMap.ToVersion!;
+        var targetDeployment = _deploymentLocator.BuildNextDeploymentDirectory(targetVersion);
+        var partialMarker = Path.Combine(targetDeployment, ".partial");
+        var snapshot = new SnapshotMetadata
+        {
+            SnapshotId = Guid.NewGuid().ToString("N"),
+            SourceVersion = currentVersion,
+            TargetVersion = targetVersion,
+            CreatedAt = DateTimeOffset.UtcNow,
+            SourceDirectory = currentDeployment,
+            TargetDirectory = targetDeployment,
+            Status = "pending"
+        };
+        var snapshotPath = Path.Combine(_snapshotsRoot, $"{snapshot.SnapshotId}.json");
+
+        var extractRoot = Path.Combine(_incomingRoot, "extracted");
+        try
+        {
+            SaveSnapshot(snapshotPath, snapshot);
+
+            if (Directory.Exists(extractRoot))
+            {
+                Directory.Delete(extractRoot, true);
+            }
+
+            Directory.CreateDirectory(extractRoot);
+            ZipFile.ExtractToDirectory(archivePath, extractRoot, overwriteFiles: true);
+
+            Directory.CreateDirectory(targetDeployment);
+            File.WriteAllText(partialMarker, string.Empty);
+
+            foreach (var file in fileMap.Files)
+            {
+                ApplyFileEntry(file, currentDeployment, targetDeployment, extractRoot);
+            }
+
+            foreach (var file in fileMap.Files)
+            {
+                if (!NeedsVerification(file))
+                {
+                    continue;
+                }
+
+                var fullPath = Path.Combine(targetDeployment, file.Path);
+                var actualHash = ComputeSha256Hex(fullPath);
+                if (!string.Equals(actualHash, file.Sha256, StringComparison.OrdinalIgnoreCase))
+                {
+                    throw new InvalidOperationException($"File hash mismatch for '{file.Path}'.");
+                }
+            }
+
+            ActivateDeployment(currentDeployment, targetDeployment);
+
+            snapshot.Status = "applied";
+            SaveSnapshot(snapshotPath, snapshot);
+            CleanupIncomingArtifacts();
+            // 清理旧版本，但保留最近3个版本以支持回滚
+            CleanupDestroyedDeployments();
+
+            return new LauncherResult
+            {
+                Success = true,
+                Stage = "update.apply",
+                Code = "ok",
+                Message = $"Updated to {targetVersion}.",
+                CurrentVersion = currentVersion,
+                TargetVersion = targetVersion
+            };
+        }
+        catch (Exception ex)
+        {
+            TryRollbackOnFailure(snapshot);
+            snapshot.Status = "rolled_back";
+            SaveSnapshot(snapshotPath, snapshot);
+            return new LauncherResult
+            {
+                Success = false,
+                Stage = "update.apply",
+                Code = "apply_failed",
+                Message = "Failed to apply update. Rolled back to previous version.",
+                ErrorMessage = ex.Message,
+                CurrentVersion = currentVersion,
+                RolledBackTo = currentVersion
+            };
+        }
+        finally
+        {
+            try
+            {
+                if (Directory.Exists(extractRoot))
+                {
+                    Directory.Delete(extractRoot, true);
+                }
+            }
+            catch
+            {
+            }
+        }
+    }
+
+    /// <summary>
+    /// 全新安装场景：直接应用更新包作为首次部署
+    /// </summary>
+    private async Task<LauncherResult> ApplyInitialDeploymentAsync(
+        SignedFileMap fileMap,
+        string archivePath,
+        string fileMapPath,
+        string signaturePath)
+    {
+        var targetVersion = string.IsNullOrWhiteSpace(fileMap.ToVersion) ? "1.0.0" : fileMap.ToVersion!;
+        var targetDeployment = _deploymentLocator.BuildNextDeploymentDirectory(targetVersion);
+        var partialMarker = Path.Combine(targetDeployment, ".partial");
+        var snapshotPath = Path.Combine(_snapshotsRoot, $"initial-{Guid.NewGuid():N}.json");
+
+        var extractRoot = Path.Combine(_incomingRoot, "extracted");
+        try
+        {
+            // 保存快照（用于回滚，虽然首次安装回滚意义不大）
+            var snapshot = new SnapshotMetadata
+            {
+                SnapshotId = Guid.NewGuid().ToString("N"),
+                SourceVersion = "0.0.0",
+                TargetVersion = targetVersion,
+                CreatedAt = DateTimeOffset.UtcNow,
+                SourceDirectory = "",
+                TargetDirectory = targetDeployment,
+                Status = "pending"
+            };
+            SaveSnapshot(snapshotPath, snapshot);
+
+            // 清理并解压更新包
+            if (Directory.Exists(extractRoot))
+            {
+                Directory.Delete(extractRoot, true);
+            }
+            Directory.CreateDirectory(extractRoot);
+            ZipFile.ExtractToDirectory(archivePath, extractRoot, overwriteFiles: true);
+
+            // 创建目标部署目录
+            Directory.CreateDirectory(targetDeployment);
+            File.WriteAllText(partialMarker, string.Empty);
+
+            // 应用所有文件（全新安装时，所有文件都是新增或替换）
+            foreach (var file in fileMap.Files)
+            {
+                ApplyInitialFileEntry(file, targetDeployment, extractRoot);
+            }
+
+            // 验证文件哈希
+            foreach (var file in fileMap.Files)
+            {
+                if (!NeedsVerification(file))
+                {
+                    continue;
+                }
+
+                var fullPath = Path.Combine(targetDeployment, file.Path);
+                var actualHash = ComputeSha256Hex(fullPath);
+                if (!string.Equals(actualHash, file.Sha256, StringComparison.OrdinalIgnoreCase))
+                {
+                    throw new InvalidOperationException($"File hash mismatch for '{file.Path}'.");
+                }
+            }
+
+            // 激活部署（创建 .current 标记，删除 .partial 标记）
+            var currentMarker = Path.Combine(targetDeployment, ".current");
+            File.WriteAllText(currentMarker, string.Empty);
+            if (File.Exists(partialMarker))
+            {
+                File.Delete(partialMarker);
+            }
+
+            // 清理更新包
+            snapshot.Status = "applied";
+            SaveSnapshot(snapshotPath, snapshot);
+            CleanupIncomingArtifacts();
+
+            return new LauncherResult
+            {
+                Success = true,
+                Stage = "update.apply",
+                Code = "ok",
+                Message = $"Initial deployment to {targetVersion}.",
+                CurrentVersion = "0.0.0",
+                TargetVersion = targetVersion
+            };
+        }
+        catch (Exception ex)
+        {
+            // 清理失败的目标目录
+            try
+            {
+                if (Directory.Exists(targetDeployment))
+                {
+                    Directory.Delete(targetDeployment, true);
+                }
+            }
+            catch
+            {
+            }
+
+            return new LauncherResult
+            {
+                Success = false,
+                Stage = "update.apply",
+                Code = "initial_deploy_failed",
+                Message = "Failed to apply initial deployment.",
+                ErrorMessage = ex.Message,
+                CurrentVersion = "0.0.0",
+                TargetVersion = targetVersion
+            };
+        }
+        finally
+        {
+            try
+            {
+                if (Directory.Exists(extractRoot))
+                {
+                    Directory.Delete(extractRoot, true);
+                }
+            }
+            catch
+            {
+            }
+        }
+    }
+
+    /// <summary>
+    /// 应用初始部署文件（全新安装场景，不需要源目录）
+    /// </summary>
+    private void ApplyInitialFileEntry(UpdateFileEntry file, string targetDeployment, string extractRoot)
+    {
+        var normalizedPath = NormalizeRelativePath(file.Path);
+
+        // 删除操作在全新安装时忽略
+        if (string.Equals(file.Action, "delete", StringComparison.OrdinalIgnoreCase))
+        {
+            return;
+        }
+
+        var targetPath = Path.Combine(targetDeployment, normalizedPath);
+        EnsurePathWithinRoot(targetPath, targetDeployment);
+        var targetDir = Path.GetDirectoryName(targetPath);
+        if (!string.IsNullOrWhiteSpace(targetDir))
+        {
+            Directory.CreateDirectory(targetDir);
+        }
+
+        // 无论是 add 还是 replace，都从压缩包复制
+        var archiveRelative = string.IsNullOrWhiteSpace(file.ArchivePath) ? normalizedPath : NormalizeRelativePath(file.ArchivePath);
+        var extractedPath = Path.Combine(extractRoot, archiveRelative);
+        EnsurePathWithinRoot(extractedPath, extractRoot);
+
+        if (!File.Exists(extractedPath))
+        {
+            throw new FileNotFoundException($"Archive file '{archiveRelative}' not found for '{file.Path}'.");
+        }
+
+        File.Copy(extractedPath, targetPath, overwrite: true);
+    }
+
+    public LauncherResult RollbackLatest()
+    {
+        if (!Directory.Exists(_snapshotsRoot))
+        {
+            return Failed("update.rollback", "no_snapshot", "No snapshot found.");
+        }
+
+        var snapshotPath = Directory
+            .EnumerateFiles(_snapshotsRoot, "*.json", SearchOption.TopDirectoryOnly)
+            .OrderByDescending(File.GetCreationTimeUtc)
+            .FirstOrDefault();
+        if (string.IsNullOrWhiteSpace(snapshotPath))
+        {
+            return Failed("update.rollback", "no_snapshot", "No snapshot found.");
+        }
+
+        var snapshot = JsonSerializer.Deserialize(File.ReadAllText(snapshotPath), AppJsonContext.Default.SnapshotMetadata);
+        if (snapshot is null || string.IsNullOrWhiteSpace(snapshot.SourceDirectory))
+        {
+            return Failed("update.rollback", "invalid_snapshot", "Invalid snapshot metadata.");
+        }
+
+        var currentDeployment = _deploymentLocator.FindCurrentDeploymentDirectory();
+        if (string.IsNullOrWhiteSpace(currentDeployment))
+        {
+            return Failed("update.rollback", "no_current_deployment", "Current deployment not found.");
+        }
+
+        ActivateDeployment(currentDeployment, snapshot.SourceDirectory);
+        snapshot.Status = "manual_rollback";
+        SaveSnapshot(snapshotPath, snapshot);
+
+        return new LauncherResult
+        {
+            Success = true,
+            Stage = "update.rollback",
+            Code = "ok",
+            Message = $"Rolled back to {snapshot.SourceVersion}.",
+            RolledBackTo = snapshot.SourceVersion
+        };
+    }
+
+    public void CleanupDestroyedDeployments()
+    {
+        foreach (var dir in Directory.EnumerateDirectories(_appRoot, "app-*", SearchOption.TopDirectoryOnly))
+        {
+            if (!File.Exists(Path.Combine(dir, ".destroy")))
+            {
+                continue;
+            }
+
+            try
+            {
+                Directory.Delete(dir, true);
+            }
+            catch
+            {
+            }
+        }
+    }
+
+    private void ApplyFileEntry(UpdateFileEntry file, string currentDeployment, string targetDeployment, string extractRoot)
+    {
+        var normalizedPath = NormalizeRelativePath(file.Path);
+        if (string.Equals(file.Action, "delete", StringComparison.OrdinalIgnoreCase))
+        {
+            return;
+        }
+
+        var targetPath = Path.Combine(targetDeployment, normalizedPath);
+        EnsurePathWithinRoot(targetPath, targetDeployment);
+        var targetDir = Path.GetDirectoryName(targetPath);
+        if (!string.IsNullOrWhiteSpace(targetDir))
+        {
+            Directory.CreateDirectory(targetDir);
+        }
+
+        if (string.Equals(file.Action, "reuse", StringComparison.OrdinalIgnoreCase))
+        {
+            var sourcePath = Path.Combine(currentDeployment, normalizedPath);
+            EnsurePathWithinRoot(sourcePath, currentDeployment);
+            if (!File.Exists(sourcePath))
+            {
+                throw new FileNotFoundException($"Cannot reuse file '{file.Path}' because it was not found in current deployment.");
+            }
+
+            File.Copy(sourcePath, targetPath, overwrite: true);
+            return;
+        }
+
+        var archiveRelative = string.IsNullOrWhiteSpace(file.ArchivePath) ? normalizedPath : NormalizeRelativePath(file.ArchivePath);
+        var extractedPath = Path.Combine(extractRoot, archiveRelative);
+        EnsurePathWithinRoot(extractedPath, extractRoot);
+        if (!File.Exists(extractedPath))
+        {
+            throw new FileNotFoundException($"Archive file '{archiveRelative}' not found for '{file.Path}'.");
+        }
+
+        File.Copy(extractedPath, targetPath, overwrite: true);
+    }
+
+    private void ActivateDeployment(string fromDeployment, string toDeployment)
+    {
+        var toCurrent = Path.Combine(toDeployment, ".current");
+        var fromCurrent = Path.Combine(fromDeployment, ".current");
+        var fromDestroy = Path.Combine(fromDeployment, ".destroy");
+        var toPartial = Path.Combine(toDeployment, ".partial");
+
+        File.WriteAllText(toCurrent, string.Empty);
+        if (File.Exists(fromCurrent))
+        {
+            File.Delete(fromCurrent);
+        }
+
+        File.WriteAllText(fromDestroy, string.Empty);
+        if (File.Exists(toPartial))
+        {
+            File.Delete(toPartial);
+        }
+    }
+
+    private void TryRollbackOnFailure(SnapshotMetadata snapshot)
+    {
+        try
+        {
+            if (!string.IsNullOrWhiteSpace(snapshot.TargetDirectory) && Directory.Exists(snapshot.TargetDirectory))
+            {
+                Directory.Delete(snapshot.TargetDirectory, true);
+            }
+
+            if (File.Exists(Path.Combine(snapshot.SourceDirectory, ".destroy")))
+            {
+                File.Delete(Path.Combine(snapshot.SourceDirectory, ".destroy"));
+            }
+
+            if (!File.Exists(Path.Combine(snapshot.SourceDirectory, ".current")))
+            {
+                File.WriteAllText(Path.Combine(snapshot.SourceDirectory, ".current"), string.Empty);
+            }
+        }
+        catch
+        {
+        }
+    }
+
+    private void CleanupIncomingArtifacts()
+    {
+        foreach (var path in new[]
+                 {
+                     Path.Combine(_incomingRoot, SignedFileMapName),
+                     Path.Combine(_incomingRoot, SignatureFileName),
+                     Path.Combine(_incomingRoot, ArchiveFileName)
+                 })
+        {
+            try
+            {
+                if (File.Exists(path))
+                {
+                    File.Delete(path);
+                }
+            }
+            catch
+            {
+            }
+        }
+    }
+
+    private (bool Success, string Message) VerifySignature(string fileMapPath, string signaturePath)
+    {
+        if (!File.Exists(signaturePath))
+        {
+            return (false, "Missing files.json.sig.");
+        }
+
+        var publicKeyPath = Path.Combine(_launcherRoot, UpdateDirectoryName, PublicKeyFileName);
+        if (!File.Exists(publicKeyPath))
+        {
+            return (false, $"Missing public key: {publicKeyPath}");
+        }
+
+        var jsonBytes = File.ReadAllBytes(fileMapPath);
+        var signatureBase64 = File.ReadAllText(signaturePath).Trim();
+        if (string.IsNullOrWhiteSpace(signatureBase64))
+        {
+            return (false, "Signature is empty.");
+        }
+
+        byte[] signature;
+        try
+        {
+            signature = Convert.FromBase64String(signatureBase64);
+        }
+        catch (FormatException)
+        {
+            return (false, "Signature is not valid base64.");
+        }
+
+        using var rsa = RSA.Create();
+        rsa.ImportFromPem(File.ReadAllText(publicKeyPath));
+        var isValid = rsa.VerifyData(jsonBytes, signature, HashAlgorithmName.SHA256, RSASignaturePadding.Pkcs1);
+        return isValid ? (true, "ok") : (false, "Signature verification failed.");
+    }
+
+    private static string NormalizeRelativePath(string path)
+    {
+        var normalized = path.Replace('\\', Path.DirectorySeparatorChar).Replace('/', Path.DirectorySeparatorChar);
+        return normalized.TrimStart(Path.DirectorySeparatorChar);
+    }
+
+    private static void EnsurePathWithinRoot(string targetPath, string rootPath)
+    {
+        var fullTarget = Path.GetFullPath(targetPath);
+        var fullRoot = Path.GetFullPath(rootPath);
+        if (!fullTarget.StartsWith(fullRoot, StringComparison.OrdinalIgnoreCase))
+        {
+            throw new InvalidOperationException($"Path traversal detected: {targetPath}");
+        }
+    }
+
+    private static bool NeedsVerification(UpdateFileEntry file)
+    {
+        return !string.Equals(file.Action, "delete", StringComparison.OrdinalIgnoreCase) &&
+               !string.IsNullOrWhiteSpace(file.Sha256);
+    }
+
+    private static string ComputeSha256Hex(string filePath)
+    {
+        using var stream = File.OpenRead(filePath);
+        var hash = SHA256.HashData(stream);
+        return Convert.ToHexString(hash).ToLowerInvariant();
+    }
+
+    private static void SaveSnapshot(string path, SnapshotMetadata snapshot)
+    {
+        File.WriteAllText(path, JsonSerializer.Serialize(snapshot, AppJsonContext.Default.SnapshotMetadata));
+    }
+
+    private static LauncherResult Failed(string stage, string code, string message)
+    {
+        return new LauncherResult
+        {
+            Success = false,
+            Stage = stage,
+            Code = code,
+            Message = message,
+            ErrorMessage = message
+        };
+    }
+}

LanMountainDesktop.Launcher/ViewModels/DevDebugWindowViewModel.cs

@@ -0,0 +1,263 @@
+using System.ComponentModel;
+using System.Runtime.CompilerServices;
+using System.Windows.Input;
+
+namespace LanMountainDesktop.Launcher.ViewModels;
+
+/// <summary>
+/// 开发调试窗口 ViewModel
+/// </summary>
+public sealed class DevDebugWindowViewModel : INotifyPropertyChanged
+{
+    private bool _isSplashEnabled = true;
+    private bool _isErrorEnabled = true;
+    private bool _isUpdateEnabled = true;
+    private bool _isOobeEnabled = true;
+    private string _statusMessage = "就绪";
+
+    public event PropertyChangedEventHandler? PropertyChanged;
+
+    #region 页面开关
+
+    /// <summary>
+    /// 启动画面是否启用实际功能
+    /// </summary>
+    public bool IsSplashEnabled
+    {
+        get => _isSplashEnabled;
+        set
+        {
+            if (_isSplashEnabled != value)
+            {
+                _isSplashEnabled = value;
+                OnPropertyChanged();
+                UpdateStatus($"启动画面: {(value ? "功能模式" : "仅查看")}");
+            }
+        }
+    }
+
+    /// <summary>
+    /// 错误页面是否启用实际功能
+    /// </summary>
+    public bool IsErrorEnabled
+    {
+        get => _isErrorEnabled;
+        set
+        {
+            if (_isErrorEnabled != value)
+            {
+                _isErrorEnabled = value;
+                OnPropertyChanged();
+                UpdateStatus($"错误页面: {(value ? "功能模式" : "仅查看")}");
+            }
+        }
+    }
+
+    /// <summary>
+    /// 更新页面是否启用实际功能
+    /// </summary>
+    public bool IsUpdateEnabled
+    {
+        get => _isUpdateEnabled;
+        set
+        {
+            if (_isUpdateEnabled != value)
+            {
+                _isUpdateEnabled = value;
+                OnPropertyChanged();
+                UpdateStatus($"更新页面: {(value ? "功能模式" : "仅查看")}");
+            }
+        }
+    }
+
+    /// <summary>
+    /// OOBE页面是否启用实际功能
+    /// </summary>
+    public bool IsOobeEnabled
+    {
+        get => _isOobeEnabled;
+        set
+        {
+            if (_isOobeEnabled != value)
+            {
+                _isOobeEnabled = value;
+                OnPropertyChanged();
+                UpdateStatus($"OOBE页面: {(value ? "功能模式" : "仅查看")}");
+            }
+        }
+    }
+
+    #endregion
+
+    #region 状态信息
+
+    /// <summary>
+    /// 状态消息
+    /// </summary>
+    public string StatusMessage
+    {
+        get => _statusMessage;
+        private set
+        {
+            if (_statusMessage != value)
+            {
+                _statusMessage = value;
+                OnPropertyChanged();
+            }
+        }
+    }
+
+    #endregion
+
+    #region 命令
+
+    /// <summary>
+    /// 打开启动画面命令
+    /// </summary>
+    public ICommand OpenSplashCommand { get; }
+
+    /// <summary>
+    /// 打开错误页面命令
+    /// </summary>
+    public ICommand OpenErrorCommand { get; }
+
+    /// <summary>
+    /// 打开更新页面命令
+    /// </summary>
+    public ICommand OpenUpdateCommand { get; }
+
+    /// <summary>
+    /// 打开OOBE页面命令
+    /// </summary>
+    public ICommand OpenOobeCommand { get; }
+
+    /// <summary>
+    /// 全部切换到查看模式命令
+    /// </summary>
+    public ICommand SetAllViewOnlyCommand { get; }
+
+    /// <summary>
+    /// 全部切换到功能模式命令
+    /// </summary>
+    public ICommand SetAllFunctionalCommand { get; }
+
+    /// <summary>
+    /// 关闭窗口命令
+    /// </summary>
+    public ICommand CloseCommand { get; }
+
+    #endregion
+
+    #region 事件
+
+    /// <summary>
+    /// 请求打开启动画面
+    /// </summary>
+    public event EventHandler<SplashOpenEventArgs>? OpenSplashRequested;
+
+    /// <summary>
+    /// 请求打开错误页面
+    /// </summary>
+    public event EventHandler<ErrorOpenEventArgs>? OpenErrorRequested;
+
+    /// <summary>
+    /// 请求打开更新页面
+    /// </summary>
+    public event EventHandler<UpdateOpenEventArgs>? OpenUpdateRequested;
+
+    /// <summary>
+    /// 请求打开OOBE页面
+    /// </summary>
+    public event EventHandler<OobeOpenEventArgs>? OpenOobeRequested;
+
+    /// <summary>
+    /// 请求关闭窗口
+    /// </summary>
+    public event EventHandler? CloseRequested;
+
+    #endregion
+
+    public DevDebugWindowViewModel()
+    {
+        OpenSplashCommand = new RelayCommand(() =>
+        {
+            OpenSplashRequested?.Invoke(this, new SplashOpenEventArgs(IsSplashEnabled));
+        });
+
+        OpenErrorCommand = new RelayCommand(() =>
+        {
+            OpenErrorRequested?.Invoke(this, new ErrorOpenEventArgs(IsErrorEnabled));
+        });
+
+        OpenUpdateCommand = new RelayCommand(() =>
+        {
+            OpenUpdateRequested?.Invoke(this, new UpdateOpenEventArgs(IsUpdateEnabled));
+        });
+
+        OpenOobeCommand = new RelayCommand(() =>
+        {
+            OpenOobeRequested?.Invoke(this, new OobeOpenEventArgs(IsOobeEnabled));
+        });
+
+        SetAllViewOnlyCommand = new RelayCommand(() =>
+        {
+            IsSplashEnabled = false;
+            IsErrorEnabled = false;
+            IsUpdateEnabled = false;
+            IsOobeEnabled = false;
+            UpdateStatus("全部页面已切换到查看模式");
+        });
+
+        SetAllFunctionalCommand = new RelayCommand(() =>
+        {
+            IsSplashEnabled = true;
+            IsErrorEnabled = true;
+            IsUpdateEnabled = true;
+            IsOobeEnabled = true;
+            UpdateStatus("全部页面已切换到功能模式");
+        });
+
+        CloseCommand = new RelayCommand(() =>
+        {
+            CloseRequested?.Invoke(this, EventArgs.Empty);
+        });
+    }
+
+    private void UpdateStatus(string message)
+    {
+        StatusMessage = $"[{DateTime.Now:HH:mm:ss}] {message}";
+    }
+
+    private void OnPropertyChanged([CallerMemberName] string? propertyName = null)
+    {
+        PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
+    }
+}
+
+#region 事件参数
+
+public class SplashOpenEventArgs : EventArgs
+{
+    public bool IsFunctional { get; }
+    public SplashOpenEventArgs(bool isFunctional) => IsFunctional = isFunctional;
+}
+
+public class ErrorOpenEventArgs : EventArgs
+{
+    public bool IsFunctional { get; }
+    public ErrorOpenEventArgs(bool isFunctional) => IsFunctional = isFunctional;
+}
+
+public class UpdateOpenEventArgs : EventArgs
+{
+    public bool IsFunctional { get; }
+    public UpdateOpenEventArgs(bool isFunctional) => IsFunctional = isFunctional;
+}
+
+public class OobeOpenEventArgs : EventArgs
+{
+    public bool IsFunctional { get; }
+    public OobeOpenEventArgs(bool isFunctional) => IsFunctional = isFunctional;
+}
+
+#endregion

LanMountainDesktop.Launcher/ViewModels/RelayCommand.cs

@@ -0,0 +1,67 @@
+using System.Windows.Input;
+
+namespace LanMountainDesktop.Launcher.ViewModels;
+
+/// <summary>
+/// 简单的命令实现
+/// </summary>
+public class RelayCommand : ICommand
+{
+    private readonly Action _execute;
+    private readonly Func<bool>? _canExecute;
+
+    public RelayCommand(Action execute, Func<bool>? canExecute = null)
+    {
+        _execute = execute ?? throw new ArgumentNullException(nameof(execute));
+        _canExecute = canExecute;
+    }
+
+    public bool CanExecute(object? parameter)
+    {
+        return _canExecute?.Invoke() ?? true;
+    }
+
+    public void Execute(object? parameter)
+    {
+        _execute();
+    }
+
+    public event EventHandler? CanExecuteChanged;
+
+    public void RaiseCanExecuteChanged()
+    {
+        CanExecuteChanged?.Invoke(this, EventArgs.Empty);
+    }
+}
+
+/// <summary>
+/// 带参数的 RelayCommand
+/// </summary>
+public class RelayCommand<T> : ICommand
+{
+    private readonly Action<T> _execute;
+    private readonly Predicate<T>? _canExecute;
+
+    public RelayCommand(Action<T> execute, Predicate<T>? canExecute = null)
+    {
+        _execute = execute ?? throw new ArgumentNullException(nameof(execute));
+        _canExecute = canExecute;
+    }
+
+    public bool CanExecute(object? parameter)
+    {
+        return _canExecute?.Invoke((T)parameter!) ?? true;
+    }
+
+    public void Execute(object? parameter)
+    {
+        _execute((T)parameter!);
+    }
+
+    public event EventHandler? CanExecuteChanged;
+
+    public void RaiseCanExecuteChanged()
+    {
+        CanExecuteChanged?.Invoke(this, EventArgs.Empty);
+    }
+}

LanMountainDesktop.Launcher/Views/DevDebugWindow.axaml

@@ -0,0 +1,182 @@
+<Window xmlns="https://github.com/avaloniaui"
+        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+        xmlns:vm="clr-namespace:LanMountainDesktop.Launcher.ViewModels"
+        mc:Ignorable="d" d:DesignWidth="500" d:DesignHeight="600"
+        x:Class="LanMountainDesktop.Launcher.Views.DevDebugWindow"
+        x:DataType="vm:DevDebugWindowViewModel"
+        Title="开发调试窗口 - Launcher"
+        Width="500"
+        Height="600"
+        WindowStartupLocation="CenterScreen"
+        Icon="/Assets/logo.ico">
+
+  <Design.DataContext>
+    <vm:DevDebugWindowViewModel />
+  </Design.DataContext>
+
+  <Border Padding="20"
+          Background="{DynamicResource SystemControlBackgroundAltHighBrush}">
+    <Grid RowDefinitions="Auto,*,Auto,Auto">
+      
+      <!-- 标题 -->
+      <StackPanel Grid.Row="0" Margin="0,0,0,20">
+        <TextBlock Text="🛠️ 开发调试窗口"
+                   FontSize="24"
+                   FontWeight="Bold"
+                   Foreground="{DynamicResource SystemControlForegroundBaseHighBrush}" />
+        <TextBlock Text="用于开发和调试 Launcher 的各个页面"
+                   FontSize="12"
+                   Opacity="0.7"
+                   Margin="0,5,0,0"
+                   Foreground="{DynamicResource SystemControlForegroundBaseMediumBrush}" />
+      </StackPanel>
+
+      <!-- 页面列表 -->
+      <ScrollViewer Grid.Row="1" VerticalScrollBarVisibility="Auto">
+        <StackPanel Spacing="15">
+          
+          <!-- 启动画面 -->
+          <Border Background="{DynamicResource SystemControlBackgroundAltMediumBrush}"
+                  CornerRadius="8"
+                  Padding="15">
+            <Grid ColumnDefinitions="*,Auto">
+              <StackPanel Grid.Column="0">
+                <TextBlock Text="🚀 启动画面 (SplashWindow)"
+                           FontWeight="SemiBold"
+                           FontSize="14" />
+                <TextBlock Text="显示启动进度和状态"
+                           FontSize="11"
+                           Opacity="0.6"
+                           Margin="0,3,0,0" />
+              </StackPanel>
+              <StackPanel Grid.Column="1" Spacing="8">
+                <ToggleSwitch Content="启用功能"
+                              IsChecked="{Binding IsSplashEnabled}"
+                              OnContent="功能"
+                              OffContent="查看" />
+                <Button Content="打开"
+                        Command="{Binding OpenSplashCommand}"
+                        HorizontalAlignment="Right" />
+              </StackPanel>
+            </Grid>
+          </Border>
+
+          <!-- 错误页面 -->
+          <Border Background="{DynamicResource SystemControlBackgroundAltMediumBrush}"
+                  CornerRadius="8"
+                  Padding="15">
+            <Grid ColumnDefinitions="*,Auto">
+              <StackPanel Grid.Column="0">
+                <TextBlock Text="❌ 错误页面 (ErrorWindow)"
+                           FontWeight="SemiBold"
+                           FontSize="14" />
+                <TextBlock Text="显示错误信息和重试选项"
+                           FontSize="11"
+                           Opacity="0.6"
+                           Margin="0,3,0,0" />
+              </StackPanel>
+              <StackPanel Grid.Column="1" Spacing="8">
+                <ToggleSwitch Content="启用功能"
+                              IsChecked="{Binding IsErrorEnabled}"
+                              OnContent="功能"
+                              OffContent="查看" />
+                <Button Content="打开"
+                        Command="{Binding OpenErrorCommand}"
+                        HorizontalAlignment="Right" />
+              </StackPanel>
+            </Grid>
+          </Border>
+
+          <!-- 更新页面 -->
+          <Border Background="{DynamicResource SystemControlBackgroundAltMediumBrush}"
+                  CornerRadius="8"
+                  Padding="15">
+            <Grid ColumnDefinitions="*,Auto">
+              <StackPanel Grid.Column="0">
+                <TextBlock Text="⬆️ 更新页面 (UpdateWindow)"
+                           FontWeight="SemiBold"
+                           FontSize="14" />
+                <TextBlock Text="显示更新进度和状态"
+                           FontSize="11"
+                           Opacity="0.6"
+                           Margin="0,3,0,0" />
+              </StackPanel>
+              <StackPanel Grid.Column="1" Spacing="8">
+                <ToggleSwitch Content="启用功能"
+                              IsChecked="{Binding IsUpdateEnabled}"
+                              OnContent="功能"
+                              OffContent="查看" />
+                <Button Content="打开"
+                        Command="{Binding OpenUpdateCommand}"
+                        HorizontalAlignment="Right" />
+              </StackPanel>
+            </Grid>
+          </Border>
+
+          <!-- OOBE页面 -->
+          <Border Background="{DynamicResource SystemControlBackgroundAltMediumBrush}"
+                  CornerRadius="8"
+                  Padding="15">
+            <Grid ColumnDefinitions="*,Auto">
+              <StackPanel Grid.Column="0">
+                <TextBlock Text="👋 OOBE页面 (OobeWindow)"
+                           FontWeight="SemiBold"
+                           FontSize="14" />
+                <TextBlock Text="首次运行引导页面"
+                           FontSize="11"
+                           Opacity="0.6"
+                           Margin="0,3,0,0" />
+              </StackPanel>
+              <StackPanel Grid.Column="1" Spacing="8">
+                <ToggleSwitch Content="启用功能"
+                              IsChecked="{Binding IsOobeEnabled}"
+                              OnContent="功能"
+                              OffContent="查看" />
+                <Button Content="打开"
+                        Command="{Binding OpenOobeCommand}"
+                        HorizontalAlignment="Right" />
+              </StackPanel>
+            </Grid>
+          </Border>
+
+        </StackPanel>
+      </ScrollViewer>
+
+      <!-- 批量操作 -->
+      <StackPanel Grid.Row="2" 
+                  Orientation="Horizontal"
+                  HorizontalAlignment="Center"
+                  Spacing="10"
+                  Margin="0,15">
+        <Button Content="全部设为查看模式"
+                Command="{Binding SetAllViewOnlyCommand}"
+                Background="{DynamicResource SystemControlBackgroundAltMediumBrush}" />
+        <Button Content="全部设为功能模式"
+                Command="{Binding SetAllFunctionalCommand}"
+                Background="{DynamicResource SystemControlHighlightAccentBrush}"
+                Foreground="White" />
+      </StackPanel>
+
+      <!-- 底部状态栏 -->
+      <Border Grid.Row="3"
+              Background="{DynamicResource SystemControlBackgroundAltMediumBrush}"
+              CornerRadius="4"
+              Padding="10">
+        <Grid ColumnDefinitions="*,Auto">
+          <TextBlock Grid.Column="0"
+                     Text="{Binding StatusMessage}"
+                     FontSize="11"
+                     Opacity="0.8"
+                     TextTrimming="CharacterEllipsis" />
+          <Button Grid.Column="1"
+                  Content="关闭"
+                  Command="{Binding CloseCommand}"
+                  Padding="15,5" />
+        </Grid>
+      </Border>
+
+    </Grid>
+  </Border>
+</Window>

LanMountainDesktop.Launcher/Views/DevDebugWindow.axaml.cs

@@ -0,0 +1,196 @@
+using Avalonia.Controls;
+using Avalonia.Markup.Xaml;
+using LanMountainDesktop.Launcher.Services;
+using LanMountainDesktop.Launcher.ViewModels;
+using LanMountainDesktop.Launcher.Views;
+
+namespace LanMountainDesktop.Launcher.Views;
+
+/// <summary>
+/// 开发调试窗口
+/// </summary>
+public partial class DevDebugWindow : Window
+{
+    private readonly DevDebugWindowViewModel _viewModel;
+
+    public DevDebugWindow()
+    {
+        AvaloniaXamlLoader.Load(this);
+
+        _viewModel = new DevDebugWindowViewModel();
+        DataContext = _viewModel;
+
+        // 订阅事件
+        _viewModel.OpenSplashRequested += OnOpenSplashRequested;
+        _viewModel.OpenErrorRequested += OnOpenErrorRequested;
+        _viewModel.OpenUpdateRequested += OnOpenUpdateRequested;
+        _viewModel.OpenOobeRequested += OnOpenOobeRequested;
+        _viewModel.CloseRequested += OnCloseRequested;
+    }
+
+    /// <summary>
+    /// 打开启动画面
+    /// </summary>
+    private void OnOpenSplashRequested(object? sender, SplashOpenEventArgs e)
+    {
+        var splashWindow = new SplashWindow();
+        
+        if (!e.IsFunctional)
+        {
+            // 查看模式：显示模拟内容
+            splashWindow.SetDebugMode(true);
+        }
+        
+        splashWindow.Show();
+        
+        if (e.IsFunctional)
+        {
+            // 功能模式：模拟正常启动流程
+            _ = SimulateSplashProgress(splashWindow);
+        }
+    }
+
+    /// <summary>
+    /// 打开错误页面
+    /// </summary>
+    private void OnOpenErrorRequested(object? sender, ErrorOpenEventArgs e)
+    {
+        var errorWindow = new ErrorWindow();
+        
+        if (!e.IsFunctional)
+        {
+            // 查看模式：显示模拟错误
+            errorWindow.SetDebugMode(true);
+            errorWindow.SetErrorMessage("[调试模式] 这是一个模拟的错误消息，用于查看错误页面的样式和布局。");
+        }
+        else
+        {
+            // 功能模式：显示真实错误
+            errorWindow.SetErrorMessage("找不到阑山桌面应用程序。\n\n请检查应用安装是否完整。");
+        }
+        
+        errorWindow.Show();
+    }
+
+    /// <summary>
+    /// 打开更新页面
+    /// </summary>
+    private void OnOpenUpdateRequested(object? sender, UpdateOpenEventArgs e)
+    {
+        var updateWindow = new UpdateWindow();
+        
+        if (!e.IsFunctional)
+        {
+            // 查看模式：显示模拟更新
+            updateWindow.SetDebugMode(true);
+        }
+        
+        updateWindow.Show();
+        
+        if (e.IsFunctional)
+        {
+            // 功能模式：模拟更新进度
+            _ = SimulateUpdateProgress(updateWindow);
+        }
+    }
+
+    /// <summary>
+    /// 打开OOBE页面
+    /// </summary>
+    private void OnOpenOobeRequested(object? sender, OobeOpenEventArgs e)
+    {
+        var oobeWindow = new OobeWindow();
+        
+        if (!e.IsFunctional)
+        {
+            // 查看模式：显示调试标记（通过标题）
+            oobeWindow.Title = "[调试模式] 欢迎使用阑山桌面";
+        }
+        
+        oobeWindow.Show();
+        
+        if (e.IsFunctional)
+        {
+            // 功能模式：等待用户点击后自动关闭
+            _ = SimulateOobeProgress(oobeWindow);
+        }
+    }
+
+    /// <summary>
+    /// 模拟OOBE流程
+    /// </summary>
+    private async Task SimulateOobeProgress(OobeWindow oobeWindow)
+    {
+        try
+        {
+            // 等待用户点击开始按钮
+            await oobeWindow.WaitForEnterAsync();
+            
+            // 用户点击后，窗口会自动关闭（通过OobeWindow内部的动画和关闭逻辑）
+            Console.WriteLine("[DevDebugWindow] OOBE completed by user");
+        }
+        catch (Exception ex)
+        {
+            Console.Error.WriteLine($"[DevDebugWindow] Error during OOBE simulation: {ex.Message}");
+        }
+    }
+
+    /// <summary>
+    /// 关闭窗口
+    /// </summary>
+    private void OnCloseRequested(object? sender, EventArgs e)
+    {
+        Close();
+    }
+
+    /// <summary>
+    /// 模拟启动画面进度
+    /// </summary>
+    private async Task SimulateSplashProgress(SplashWindow splashWindow)
+    {
+        var stages = new[] { "初始化", "检查更新", "加载组件", "启动应用" };
+        var reporter = (ISplashStageReporter)splashWindow;
+        
+        for (int i = 0; i < stages.Length; i++)
+        {
+            reporter.ReportStage(stages[i], (i + 1) * 25);
+            await Task.Delay(500);
+        }
+        
+        // 3秒后关闭
+        await Task.Delay(3000);
+        splashWindow.Close();
+    }
+
+    /// <summary>
+    /// 模拟更新进度
+    /// </summary>
+    private async Task SimulateUpdateProgress(UpdateWindow updateWindow)
+    {
+        var stages = new[] { "下载", "验证", "安装", "清理" };
+        
+        foreach (var stage in stages)
+        {
+            updateWindow.Report(stage, $"正在{stage}...", Array.IndexOf(stages, stage) * 25 + 10);
+            await Task.Delay(800);
+        }
+        
+        updateWindow.ReportComplete(true, null);
+        
+        // 2秒后关闭
+        await Task.Delay(2000);
+        updateWindow.Close();
+    }
+
+    protected override void OnClosed(EventArgs e)
+    {
+        // 取消订阅事件
+        _viewModel.OpenSplashRequested -= OnOpenSplashRequested;
+        _viewModel.OpenErrorRequested -= OnOpenErrorRequested;
+        _viewModel.OpenUpdateRequested -= OnOpenUpdateRequested;
+        _viewModel.OpenOobeRequested -= OnOpenOobeRequested;
+        _viewModel.CloseRequested -= OnCloseRequested;
+        
+        base.OnClosed(e);
+    }
+}

LanMountainDesktop.Launcher/Views/ErrorDebugWindow.axaml

@@ -0,0 +1,107 @@
+<Window xmlns="https://github.com/avaloniaui"
+        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+        xmlns:views="clr-namespace:LanMountainDesktop.Launcher.Views"
+        mc:Ignorable="d"
+        d:DesignWidth="420"
+        d:DesignHeight="320"
+        x:Class="LanMountainDesktop.Launcher.Views.ErrorDebugWindow"
+        x:DataType="views:ErrorDebugWindow"
+        Title="调试模式"
+        Width="420"
+        Height="320"
+        CanResize="False"
+        WindowStartupLocation="CenterOwner"
+        Background="{DynamicResource SolidBackgroundFillColorBaseBrush}"
+        TransparencyLevelHint="None"
+        Icon="/Assets/logo.ico">
+  <Design.DataContext>
+    <views:ErrorDebugWindow />
+  </Design.DataContext>
+
+  <Grid Margin="24" RowDefinitions="Auto,*,Auto">
+    <!-- 标题 -->
+    <TextBlock Grid.Row="0"
+               Text="调试设置"
+               FontSize="20"
+               FontWeight="SemiBold"
+               Foreground="{DynamicResource TextFillColorPrimaryBrush}"
+               Margin="0,0,0,16" />
+
+    <!-- 设置内容 -->
+    <StackPanel Grid.Row="1" Spacing="16">
+      <!-- 开发模式开关 -->
+      <Border Background="{DynamicResource CardBackgroundFillColorDefaultBrush}"
+              CornerRadius="{DynamicResource ControlCornerRadius}"
+              Padding="16,12">
+        <Grid ColumnDefinitions="*,Auto">
+          <StackPanel Grid.Column="0" VerticalAlignment="Center">
+            <TextBlock Text="开发模式"
+                       FontSize="14"
+                       Foreground="{DynamicResource TextFillColorPrimaryBrush}" />
+            <TextBlock Text="启用后自动扫描开发目录"
+                       FontSize="12"
+                       Foreground="{DynamicResource TextFillColorSecondaryBrush}"
+                       Margin="0,2,0,0" />
+          </StackPanel>
+          <ToggleSwitch x:Name="DevModeToggle"
+                        Grid.Column="1"
+                        OnContent="开"
+                        OffContent="关" />
+        </Grid>
+      </Border>
+
+      <!-- 应用路径选择 -->
+      <Border Background="{DynamicResource CardBackgroundFillColorDefaultBrush}"
+              CornerRadius="{DynamicResource ControlCornerRadius}"
+              Padding="16,12">
+        <Grid RowDefinitions="Auto,Auto" ColumnDefinitions="*,Auto">
+          <TextBlock Grid.Row="0" Grid.Column="0"
+                     Text="应用路径"
+                     FontSize="14"
+                     Foreground="{DynamicResource TextFillColorPrimaryBrush}" />
+          <TextBlock x:Name="PathTextBlock"
+                     Grid.Row="1" Grid.Column="0"
+                     Text="未选择"
+                     FontSize="12"
+                     Foreground="{DynamicResource TextFillColorSecondaryBrush}"
+                     TextTrimming="CharacterEllipsis"
+                     Margin="0,4,12,0" />
+          <Button x:Name="BrowseButton"
+                  Grid.Row="0" Grid.RowSpan="2" Grid.Column="1"
+                  Content="浏览..."
+                  VerticalAlignment="Center" />
+        </Grid>
+      </Border>
+
+      <!-- 提示信息 -->
+      <Border Background="{DynamicResource SystemFillColorCautionBackgroundBrush}"
+              CornerRadius="{DynamicResource ControlCornerRadius}"
+              Padding="12,10"
+              IsVisible="True">
+        <TextBlock Text="此功能仅供开发人员使用"
+                   FontSize="12"
+                   Foreground="{DynamicResource SystemFillColorCautionBrush}"
+                   TextWrapping="Wrap" />
+      </Border>
+    </StackPanel>
+
+    <!-- 按钮区域 -->
+    <StackPanel Grid.Row="2"
+                Orientation="Horizontal"
+                HorizontalAlignment="Right"
+                Spacing="12"
+                Margin="0,16,0,0">
+      <Button x:Name="CancelButton"
+              Content="取消"
+              Width="80"
+              Height="32" />
+      <Button x:Name="OkButton"
+              Content="确定"
+              Width="80"
+              Height="32"
+              Theme="{DynamicResource AccentButtonTheme}" />
+    </StackPanel>
+  </Grid>
+</Window>

LanMountainDesktop.Launcher/Views/ErrorDebugWindow.axaml.cs

@@ -0,0 +1,172 @@
+using Avalonia.Controls;
+using Avalonia.Interactivity;
+using Avalonia.Markup.Xaml;
+using Avalonia.Platform.Storage;
+
+namespace LanMountainDesktop.Launcher.Views;
+
+/// <summary>
+/// 错误调试窗口 - 开发人员专用调试设置
+/// </summary>
+public partial class ErrorDebugWindow : Window
+{
+    private string? _selectedHostPath;
+    private bool _isInitialized = false;
+
+    /// <summary>
+    /// 是否启用了开发模式
+    /// </summary>
+    public bool IsDevModeEnabled { get; private set; }
+
+    /// <summary>
+    /// 选择的主程序路径
+    /// </summary>
+    public string? SelectedHostPath => _selectedHostPath;
+
+    public ErrorDebugWindow()
+    {
+        AvaloniaXamlLoader.Load(this);
+        
+        // 延迟到窗口加载完成后再初始化组件
+        this.Loaded += OnWindowLoaded;
+    }
+
+    public ErrorDebugWindow(bool devModeEnabled, string? initialPath) : this()
+    {
+        IsDevModeEnabled = devModeEnabled;
+        _selectedHostPath = initialPath;
+    }
+
+    /// <summary>
+    /// 窗口加载完成事件
+    /// </summary>
+    private void OnWindowLoaded(object? sender, RoutedEventArgs e)
+    {
+        if (_isInitialized) return;
+        _isInitialized = true;
+        
+        Console.WriteLine("[ErrorDebugWindow] Window loaded, initializing components...");
+        InitializeComponents();
+        
+        // 设置初始值（在视觉树准备好后）
+        var devModeToggle = this.FindControl<ToggleSwitch>("DevModeToggle");
+        if (devModeToggle is not null)
+        {
+            devModeToggle.IsChecked = IsDevModeEnabled;
+        }
+
+        UpdatePathDisplay(_selectedHostPath);
+    }
+
+    private void InitializeComponents()
+    {
+        // 开发模式开关
+        var devModeToggle = this.FindControl<ToggleSwitch>("DevModeToggle");
+        if (devModeToggle is not null)
+        {
+            devModeToggle.IsCheckedChanged += (s, e) =>
+            {
+                IsDevModeEnabled = devModeToggle.IsChecked ?? false;
+                Console.WriteLine($"[ErrorDebugWindow] DevMode changed to: {IsDevModeEnabled}");
+            };
+            Console.WriteLine("[ErrorDebugWindow] DevModeToggle event bound");
+        }
+        else
+        {
+            Console.Error.WriteLine("[ErrorDebugWindow] Failed to find DevModeToggle!");
+        }
+
+        // 浏览按钮
+        var browseButton = this.FindControl<Button>("BrowseButton");
+        if (browseButton is not null)
+        {
+            browseButton.Click += OnBrowseClick;
+            Console.WriteLine("[ErrorDebugWindow] BrowseButton event bound");
+        }
+        else
+        {
+            Console.Error.WriteLine("[ErrorDebugWindow] Failed to find BrowseButton!");
+        }
+
+        // 确定按钮
+        var okButton = this.FindControl<Button>("OkButton");
+        if (okButton is not null)
+        {
+            okButton.Click += (s, e) => Close();
+            Console.WriteLine("[ErrorDebugWindow] OkButton event bound");
+        }
+        else
+        {
+            Console.Error.WriteLine("[ErrorDebugWindow] Failed to find OkButton!");
+        }
+
+        // 取消按钮
+        var cancelButton = this.FindControl<Button>("CancelButton");
+        if (cancelButton is not null)
+        {
+            cancelButton.Click += (s, e) =>
+            {
+                // 取消时恢复原始状态
+                IsDevModeEnabled = false;
+                _selectedHostPath = null;
+                Console.WriteLine("[ErrorDebugWindow] Cancel clicked, resetting state");
+                Close();
+            };
+            Console.WriteLine("[ErrorDebugWindow] CancelButton event bound");
+        }
+        else
+        {
+            Console.Error.WriteLine("[ErrorDebugWindow] Failed to find CancelButton!");
+        }
+        
+        Console.WriteLine("[ErrorDebugWindow] Components initialization completed");
+    }
+
+    /// <summary>
+    /// 浏览按钮点击
+    /// </summary>
+    private async void OnBrowseClick(object? sender, RoutedEventArgs e)
+    {
+        var storageProvider = StorageProvider;
+        if (storageProvider is null) return;
+
+        var options = new FilePickerOpenOptions
+        {
+            Title = "选择阑山桌面主程序",
+            AllowMultiple = false,
+            FileTypeFilter = new[]
+            {
+                new FilePickerFileType("可执行文件")
+                {
+                    Patterns = OperatingSystem.IsWindows()
+                        ? new[] { "*.exe" }
+                        : new[] { "*" }
+                }
+            }
+        };
+
+        var result = await storageProvider.OpenFilePickerAsync(options);
+        if (result.Count > 0)
+        {
+            _selectedHostPath = result[0].Path.LocalPath;
+            Console.WriteLine($"[ErrorDebugWindow] Selected host path: {_selectedHostPath}");
+            UpdatePathDisplay(_selectedHostPath);
+        }
+    }
+
+    /// <summary>
+    /// 更新路径显示
+    /// </summary>
+    private void UpdatePathDisplay(string? path)
+    {
+        var pathTextBlock = this.FindControl<TextBlock>("PathTextBlock");
+        if (pathTextBlock is not null)
+        {
+            pathTextBlock.Text = string.IsNullOrEmpty(path) ? "未选择" : path;
+        }
+        else
+        {
+            Console.Error.WriteLine("[ErrorDebugWindow] Failed to find PathTextBlock!");
+        }
+    }
+}

LanMountainDesktop.Launcher/Views/ErrorWindow.axaml

@@ -0,0 +1,105 @@
+<Window xmlns="https://github.com/avaloniaui"
+        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+        xmlns:views="clr-namespace:LanMountainDesktop.Launcher.Views"
+        xmlns:ui="using:FluentAvalonia.UI.Controls"
+        mc:Ignorable="d"
+        d:DesignWidth="520"
+        d:DesignHeight="280"
+        x:Class="LanMountainDesktop.Launcher.Views.ErrorWindow"
+        x:DataType="views:ErrorWindow"
+        Title="阑山桌面"
+        Width="520"
+        Height="280"
+        CanResize="False"
+        WindowStartupLocation="CenterScreen"
+        Background="{DynamicResource SolidBackgroundFillColorBaseBrush}"
+        TransparencyLevelHint="None"
+        Icon="/Assets/logo.ico">
+  <Design.DataContext>
+    <views:ErrorWindow />
+  </Design.DataContext>
+
+  <!-- Fluent Design 风格对话框布局 -->
+  <Grid RowDefinitions="*,Auto">
+    <!-- 主内容区域：左侧图标 + 右侧文字 -->
+    <Grid Grid.Row="0" Margin="24,24,24,16" ColumnDefinitions="Auto,*">
+      
+      <!-- 左侧：错误图标（可点击进入调试模式） -->
+      <Border x:Name="ErrorIconBorder"
+              Grid.Column="0"
+              Width="48"
+              Height="48"
+              Margin="0,4,16,0"
+              Background="{DynamicResource SystemFillColorCriticalBackgroundBrush}"
+              CornerRadius="24"
+              VerticalAlignment="Top">
+        <TextBlock Text="&#xEA39;"
+                   FontSize="24"
+                   FontFamily="{DynamicResource SymbolThemeFontFamily}"
+                   Foreground="{DynamicResource SystemFillColorCriticalBrush}"
+                   HorizontalAlignment="Center"
+                   VerticalAlignment="Center"/>
+      </Border>
+      
+      <!-- 右侧：标题 + 内容 -->
+      <StackPanel Grid.Column="1" Spacing="8">
+        <!-- 标题 -->
+        <TextBlock x:Name="TitleText"
+                   Text="启动失败"
+                   FontSize="18"
+                   FontWeight="SemiBold"
+                   Foreground="{DynamicResource TextFillColorPrimaryBrush}"
+                   TextWrapping="Wrap"/>
+        
+        <!-- 错误信息 -->
+        <TextBlock x:Name="ErrorMessageText"
+                   Text="找不到阑山桌面应用程序。"
+                   FontSize="14"
+                   Foreground="{DynamicResource TextFillColorSecondaryBrush}"
+                   TextWrapping="Wrap"
+                   LineHeight="20"/>
+        
+        <!-- 建议信息 -->
+        <TextBlock x:Name="SuggestionText"
+                   Text="请确保应用程序已正确安装，或尝试重新安装。"
+                   FontSize="13"
+                   Foreground="{DynamicResource TextFillColorTertiaryBrush}"
+                   TextWrapping="Wrap"
+                   LineHeight="18"
+                   Margin="0,4,0,0"/>
+      </StackPanel>
+    </Grid>
+
+    <!-- 底部：按钮区域 -->
+    <Border Grid.Row="1"
+            Background="{DynamicResource CardBackgroundFillColorDefaultBrush}"
+            Padding="24,16">
+      <Grid ColumnDefinitions="*,Auto">
+        <Button x:Name="OpenLogButton"
+                Grid.Column="0"
+                Content="打开日志"
+                Width="100"
+                Height="32"
+                FontSize="13"
+                HorizontalAlignment="Left"/>
+        <StackPanel Grid.Column="1"
+                    Orientation="Horizontal" 
+                    Spacing="8">
+          <Button x:Name="ExitButton"
+                  Content="退出"
+                  Width="80"
+                  Height="32"
+                  FontSize="13"/>
+          <Button x:Name="RetryButton"
+                  Content="重试"
+                  Width="80"
+                  Height="32"
+                  FontSize="13"
+                  Theme="{DynamicResource AccentButtonTheme}"/>
+        </StackPanel>
+      </Grid>
+    </Border>
+  </Grid>
+</Window>

LanMountainDesktop.Launcher/Views/ErrorWindow.axaml.cs

@@ -0,0 +1,542 @@
+using Avalonia.Controls;
+using Avalonia.Interactivity;
+using Avalonia.Markup.Xaml;
+using Avalonia.Platform.Storage;
+using LanMountainDesktop.Launcher.Services;
+using System.Diagnostics;
+
+namespace LanMountainDesktop.Launcher.Views;
+
+/// <summary>
+/// 错误窗口 - 显示启动失败信息，支持调试模式（隐藏入口）
+/// </summary>
+public partial class ErrorWindow : Window
+{
+    private readonly TaskCompletionSource<ErrorWindowResult> _completionSource = new();
+    private int _iconClickCount = 0;
+    private const int DebugModeClickThreshold = 5;
+    private bool _isDebugMode = false;
+    private string? _customHostPath;
+    private bool _devModeEnabled;
+
+    public ErrorWindow()
+    {
+        AvaloniaXamlLoader.Load(this);
+
+        // 先加载保存的状态
+        _devModeEnabled = LoadDevModeStateInternal();
+        _customHostPath = LoadCustomHostPathInternal();
+
+        // 延迟到窗口加载完成后再初始化组件，确保视觉树已准备好
+        this.Loaded += OnWindowLoaded;
+        this.Opened += OnWindowOpened;
+    }
+
+    /// <summary>
+    /// 窗口加载完成事件 - 视觉树已准备好
+    /// </summary>
+    private void OnWindowLoaded(object? sender, RoutedEventArgs e)
+    {
+        Console.WriteLine("[ErrorWindow] Window loaded, initializing components...");
+        InitializeComponents();
+    }
+
+    /// <summary>
+    /// 窗口打开事件
+    /// </summary>
+    private void OnWindowOpened(object? sender, EventArgs e)
+    {
+        Console.WriteLine("[ErrorWindow] Window opened and visible");
+    }
+
+    private void InitializeComponents()
+    {
+        Console.WriteLine("[ErrorWindow] Initializing components...");
+        
+        // 错误图标点击事件（进入调试模式 - 隐藏功能）
+        var errorIconBorder = this.FindControl<Border>("ErrorIconBorder");
+        if (errorIconBorder is not null)
+        {
+            errorIconBorder.PointerPressed += OnErrorIconClick;
+            Console.WriteLine("[ErrorWindow] ErrorIconBorder event bound successfully");
+        }
+        else
+        {
+            Console.Error.WriteLine("[ErrorWindow] Failed to find ErrorIconBorder!");
+        }
+
+        // 按钮事件
+        var retryButton = this.FindControl<Button>("RetryButton");
+        var exitButton = this.FindControl<Button>("ExitButton");
+        var openLogButton = this.FindControl<Button>("OpenLogButton");
+
+        if (retryButton is not null)
+        {
+            retryButton.Click += OnRetryClick;
+            Console.WriteLine("[ErrorWindow] RetryButton event bound");
+        }
+        else
+        {
+            Console.Error.WriteLine("[ErrorWindow] Failed to find RetryButton!");
+        }
+
+        if (exitButton is not null)
+        {
+            exitButton.Click += OnExitClick;
+            Console.WriteLine("[ErrorWindow] ExitButton event bound");
+        }
+        else
+        {
+            Console.Error.WriteLine("[ErrorWindow] Failed to find ExitButton!");
+        }
+
+        if (openLogButton is not null)
+        {
+            openLogButton.Click += OnOpenLogClick;
+            Console.WriteLine("[ErrorWindow] OpenLogButton event bound");
+        }
+        else
+        {
+            Console.Error.WriteLine("[ErrorWindow] Failed to find OpenLogButton!");
+        }
+        
+        Console.WriteLine("[ErrorWindow] Components initialization completed");
+    }
+
+    /// <summary>
+    /// 设置错误消息
+    /// </summary>
+    public void SetErrorMessage(string message)
+    {
+        var errorText = this.FindControl<TextBlock>("ErrorMessageText");
+        if (errorText is not null)
+        {
+            errorText.Text = message;
+        }
+    }
+
+    /// <summary>
+    /// 设置调试模式
+    /// </summary>
+    public void SetDebugMode(bool isDebugMode)
+    {
+        _isDebugMode = isDebugMode;
+        var titleText = this.FindControl<TextBlock>("TitleText");
+        if (titleText is not null && isDebugMode)
+        {
+            titleText.Text = "[调试模式] 错误页面";
+        }
+    }
+
+    /// <summary>
+    /// 获取用户选择的主程序路径
+    /// </summary>
+    public string? GetCustomHostPath() => _customHostPath;
+
+    /// <summary>
+    /// 是否启用了开发模式
+    /// </summary>
+    public bool IsDevModeEnabled() => _devModeEnabled;
+
+    /// <summary>
+    /// 等待用户选择
+    /// </summary>
+    public Task<ErrorWindowResult> WaitForChoiceAsync()
+    {
+        return _completionSource.Task;
+    }
+
+    /// <summary>
+    /// 错误图标点击事件 - 连续点击 5 次进入调试模式（隐藏功能）
+    /// </summary>
+    private void OnErrorIconClick(object? sender, Avalonia.Input.PointerPressedEventArgs e)
+    {
+        _iconClickCount++;
+
+        if (_iconClickCount >= DebugModeClickThreshold && !_isDebugMode)
+        {
+            EnterDebugMode();
+        }
+    }
+
+    /// <summary>
+    /// 进入调试模式 - 显示调试窗口
+    /// </summary>
+    private async void EnterDebugMode()
+    {
+        _isDebugMode = true;
+
+        // 创建并显示调试窗口
+        var debugWindow = new ErrorDebugWindow(_devModeEnabled, _customHostPath)
+        {
+            WindowStartupLocation = WindowStartupLocation.CenterOwner
+        };
+
+        // 订阅调试窗口关闭事件
+        debugWindow.Closed += (s, e) =>
+        {
+            // 更新状态
+            _devModeEnabled = debugWindow.IsDevModeEnabled;
+            _customHostPath = debugWindow.SelectedHostPath;
+
+            // 保存开发模式状态和自定义路径
+            SaveDevModeStateInternal(_devModeEnabled);
+            SaveCustomHostPathInternal(_customHostPath);
+
+            // 如果启用了开发模式且没有选择路径，自动扫描
+            if (_devModeEnabled && string.IsNullOrEmpty(_customHostPath))
+            {
+                ScanDevPaths();
+                // 扫描到路径后也保存
+                if (!string.IsNullOrEmpty(_customHostPath))
+                {
+                    SaveCustomHostPathInternal(_customHostPath);
+                }
+            }
+        };
+
+        await debugWindow.ShowDialog(this);
+    }
+
+    /// <summary>
+    /// 扫描开发路径
+    /// </summary>
+    private void ScanDevPaths()
+    {
+        var executable = OperatingSystem.IsWindows() ? "LanMountainDesktop.exe" : "LanMountainDesktop";
+        var possiblePaths = new[]
+        {
+            Path.Combine(AppContext.BaseDirectory, "..", "..", "LanMountainDesktop", "bin", "Debug", "net10.0", executable),
+            Path.Combine(AppContext.BaseDirectory, "..", "..", "LanMountainDesktop", "bin", "Release", "net10.0", executable),
+            Path.Combine(AppContext.BaseDirectory, "..", "LanMountainDesktop", "bin", "Debug", "net10.0", executable),
+            Path.Combine(AppContext.BaseDirectory, "..", "LanMountainDesktop", "bin", "Release", "net10.0", executable),
+            Path.Combine(AppContext.BaseDirectory, "..", "dev-test", "app-1.0.0-dev", executable),
+        };
+
+        foreach (var path in possiblePaths.Select(Path.GetFullPath).Distinct())
+        {
+            if (File.Exists(path))
+            {
+                _customHostPath = path;
+                break;
+            }
+        }
+    }
+
+    /// <summary>
+    /// 获取配置存储的基础目录
+    /// </summary>
+    private static string GetConfigBaseDirectory()
+    {
+        try
+        {
+            // 优先使用 LocalApplicationData（用户状态）
+            var appData = Environment.GetFolderPath(Environment.SpecialFolder.LocalApplicationData);
+            if (!string.IsNullOrEmpty(appData))
+            {
+                var configDir = Path.Combine(appData, "LanMountainDesktop", ".launcher");
+                return configDir;
+            }
+        }
+        catch
+        {
+            // LocalApplicationData 不可用，回退到 Launcher 所在目录
+        }
+
+        // 回退方案：使用 Launcher 所在目录
+        try
+        {
+            var launcherDir = AppContext.BaseDirectory;
+            var configDir = Path.Combine(launcherDir, ".launcher");
+            return configDir;
+        }
+        catch
+        {
+            // 最后的兜底：使用当前目录
+            return Path.Combine(Directory.GetCurrentDirectory(), ".launcher");
+        }
+    }
+
+    /// <summary>
+    /// 确保配置目录存在
+    /// </summary>
+    private static bool EnsureConfigDirectory(string dirPath)
+    {
+        try
+        {
+            if (!Directory.Exists(dirPath))
+            {
+                Directory.CreateDirectory(dirPath);
+                Console.WriteLine($"[ErrorWindow] Created config directory: {dirPath}");
+            }
+            return true;
+        }
+        catch (Exception ex)
+        {
+            Console.Error.WriteLine($"[ErrorWindow] Failed to create config directory: {ex.Message}");
+            return false;
+        }
+    }
+
+    /// <summary>
+    /// 保存开发模式状态（内部方法）
+    /// </summary>
+    private static void SaveDevModeStateInternal(bool enabled)
+    {
+        try
+        {
+            var configDir = GetConfigBaseDirectory();
+            if (!EnsureConfigDirectory(configDir))
+            {
+                Console.Error.WriteLine("[ErrorWindow] Cannot save dev mode: config directory unavailable");
+                return;
+            }
+
+            var devModeFile = Path.Combine(configDir, "devmode.config");
+            File.WriteAllText(devModeFile, enabled ? "1" : "0");
+            Console.WriteLine($"[ErrorWindow] Dev mode state saved: {enabled}");
+        }
+        catch (Exception ex)
+        {
+            Console.Error.WriteLine($"[ErrorWindow] Failed to save dev mode state: {ex.Message}");
+        }
+    }
+
+    /// <summary>
+    /// 加载开发模式状态（内部方法）
+    /// </summary>
+    private static bool LoadDevModeStateInternal()
+    {
+        try
+        {
+            var configDir = GetConfigBaseDirectory();
+            var devModeFile = Path.Combine(configDir, "devmode.config");
+
+            if (File.Exists(devModeFile))
+            {
+                var content = File.ReadAllText(devModeFile).Trim();
+                var enabled = content == "1";
+                Console.WriteLine($"[ErrorWindow] Dev mode state loaded: {enabled}");
+                return enabled;
+            }
+        }
+        catch (Exception ex)
+        {
+            Console.Error.WriteLine($"[ErrorWindow] Failed to load dev mode state: {ex.Message}");
+        }
+        return false;
+    }
+
+    /// <summary>
+    /// 保存自定义主程序路径（内部方法）
+    /// </summary>
+    private static void SaveCustomHostPathInternal(string? path)
+    {
+        try
+        {
+            var configDir = GetConfigBaseDirectory();
+            if (!EnsureConfigDirectory(configDir))
+            {
+                Console.Error.WriteLine("[ErrorWindow] Cannot save custom path: config directory unavailable");
+                return;
+            }
+
+            var hostPathFile = Path.Combine(configDir, "custom-host-path.config");
+            File.WriteAllText(hostPathFile, path ?? string.Empty);
+            Console.WriteLine($"[ErrorWindow] Custom host path saved: {path}");
+        }
+        catch (Exception ex)
+        {
+            Console.Error.WriteLine($"[ErrorWindow] Failed to save custom host path: {ex.Message}");
+        }
+    }
+
+    /// <summary>
+    /// 加载自定义主程序路径（内部方法）
+    /// </summary>
+    private static string? LoadCustomHostPathInternal()
+    {
+        try
+        {
+            var configDir = GetConfigBaseDirectory();
+            var hostPathFile = Path.Combine(configDir, "custom-host-path.config");
+
+            if (File.Exists(hostPathFile))
+            {
+                var content = File.ReadAllText(hostPathFile).Trim();
+                // 验证路径是否仍然有效
+                if (!string.IsNullOrEmpty(content) && File.Exists(content))
+                {
+                    Console.WriteLine($"[ErrorWindow] Custom host path loaded: {content}");
+                    return content;
+                }
+
+                // 路径已失效，清理配置文件
+                if (!string.IsNullOrEmpty(content))
+                {
+                    Console.WriteLine($"[ErrorWindow] Custom host path is no longer valid: {content}");
+                    try
+                    {
+                        File.Delete(hostPathFile);
+                        Console.WriteLine("[ErrorWindow] Cleared invalid custom host path");
+                    }
+                    catch (Exception clearEx)
+                    {
+                        Console.Error.WriteLine($"[ErrorWindow] Failed to clear invalid host path: {clearEx.Message}");
+                    }
+                }
+            }
+        }
+        catch (Exception ex)
+        {
+            Console.Error.WriteLine($"[ErrorWindow] Failed to load custom host path: {ex.Message}");
+        }
+        return null;
+    }
+
+    /// <summary>
+    /// 检查是否启用了开发模式（静态方法，启动时调用）
+    /// </summary>
+    public static bool CheckDevModeEnabled()
+    {
+        return LoadDevModeStateInternal();
+    }
+
+    /// <summary>
+    /// 获取保存的自定义主程序路径（静态方法，启动时调用）
+    /// </summary>
+    public static string? GetSavedCustomHostPath()
+    {
+        return LoadCustomHostPathInternal();
+    }
+
+    private void OnRetryClick(object? sender, RoutedEventArgs e)
+    {
+        _completionSource.TrySetResult(ErrorWindowResult.Retry);
+    }
+
+    private void OnExitClick(object? sender, RoutedEventArgs e)
+    {
+        _completionSource.TrySetResult(ErrorWindowResult.Exit);
+    }
+
+    /// <summary>
+    /// 打开日志文件
+    /// </summary>
+    private async void OnOpenLogClick(object? sender, RoutedEventArgs e)
+    {
+        try
+        {
+            var logFilePath = Logger.GetLogFilePath();
+
+            if (string.IsNullOrEmpty(logFilePath) || !File.Exists(logFilePath))
+            {
+                // 如果没有日志文件，打开日志目录
+                var logDir = Path.GetDirectoryName(logFilePath);
+                if (!string.IsNullOrEmpty(logDir) && Directory.Exists(logDir))
+                {
+                    OpenFolder(logDir);
+                }
+                else
+                {
+                    // 尝试打开配置目录
+                    var configDir = GetConfigBaseDirectory();
+                    if (Directory.Exists(configDir))
+                    {
+                        OpenFolder(configDir);
+                    }
+                    else
+                    {
+                        Console.WriteLine("[ErrorWindow] No log file or directory available");
+                    }
+                }
+                return;
+            }
+
+            Console.WriteLine($"[ErrorWindow] Opening log file: {logFilePath}");
+            OpenFile(logFilePath);
+        }
+        catch (Exception ex)
+        {
+            Console.Error.WriteLine($"[ErrorWindow] Failed to open log: {ex.Message}");
+        }
+    }
+
+    /// <summary>
+    /// 打开文件
+    /// </summary>
+    private static void OpenFile(string filePath)
+    {
+        try
+        {
+            if (OperatingSystem.IsWindows())
+            {
+                Process.Start(new ProcessStartInfo
+                {
+                    FileName = "explorer.exe",
+                    Arguments = $"\"{filePath}\"",
+                    UseShellExecute = true
+                });
+            }
+            else if (OperatingSystem.IsMacOS())
+            {
+                Process.Start("open", filePath);
+            }
+            else if (OperatingSystem.IsLinux())
+            {
+                Process.Start("xdg-open", filePath);
+            }
+        }
+        catch (Exception ex)
+        {
+            Console.Error.WriteLine($"[ErrorWindow] Failed to open file: {ex.Message}");
+        }
+    }
+
+    /// <summary>
+    /// 打开文件夹
+    /// </summary>
+    private static void OpenFolder(string folderPath)
+    {
+        try
+        {
+            if (OperatingSystem.IsWindows())
+            {
+                Process.Start(new ProcessStartInfo
+                {
+                    FileName = "explorer.exe",
+                    Arguments = $"\"{folderPath}\"",
+                    UseShellExecute = true
+                });
+            }
+            else if (OperatingSystem.IsMacOS())
+            {
+                Process.Start("open", folderPath);
+            }
+            else if (OperatingSystem.IsLinux())
+            {
+                Process.Start("xdg-open", folderPath);
+            }
+        }
+        catch (Exception ex)
+        {
+            Console.Error.WriteLine($"[ErrorWindow] Failed to open folder: {ex.Message}");
+        }
+    }
+}
+
+/// <summary>
+/// 错误窗口用户选择结果
+/// </summary>
+public enum ErrorWindowResult
+{
+    /// <summary>
+    /// 重试
+    /// </summary>
+    Retry,
+
+    /// <summary>
+    /// 退出
+    /// </summary>
+    Exit
+}

LanMountainDesktop.Launcher/Views/LoadingDetailsWindow.axaml

@@ -0,0 +1,234 @@
+<Window xmlns="https://github.com/avaloniaui"
+        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+        xmlns:views="clr-namespace:LanMountainDesktop.Launcher.Views"
+        mc:Ignorable="d"
+        d:DesignWidth="600"
+        d:DesignHeight="500"
+        x:Class="LanMountainDesktop.Launcher.Views.LoadingDetailsWindow"
+        Title="LanMountain Desktop - Loading Details"
+        Width="600"
+        Height="500"
+        WindowStartupLocation="CenterScreen"
+        CanResize="True"
+        MinWidth="500"
+        MinHeight="400"
+        Background="{DynamicResource SolidBackgroundFillColorBaseBrush}"
+        Icon="/Assets/logo.ico">
+
+  <Grid RowDefinitions="Auto,*,Auto,Auto">
+    <Border Grid.Row="0"
+            Background="{DynamicResource CardBackgroundFillColorDefaultBrush}"
+            Padding="20,16">
+      <Grid ColumnDefinitions="*,Auto">
+        <StackPanel Grid.Column="0" Spacing="4">
+          <TextBlock Text="Starting LanMountain Desktop"
+                     FontSize="18"
+                     FontWeight="SemiBold"
+                     Foreground="{DynamicResource TextFillColorPrimaryBrush}"/>
+          <TextBlock x:Name="SubtitleText"
+                     Text="Initializing..."
+                     FontSize="13"
+                     Foreground="{DynamicResource TextFillColorSecondaryBrush}"/>
+        </StackPanel>
+        <Border Grid.Column="1"
+                Background="{DynamicResource AccentFillColorDefaultBrush}"
+                CornerRadius="12"
+                Padding="12,6"
+                VerticalAlignment="Center">
+          <TextBlock x:Name="PercentText"
+                     Text="0%"
+                     FontSize="16"
+                     FontWeight="Bold"
+                     Foreground="White"/>
+        </Border>
+      </Grid>
+    </Border>
+
+    <Grid Grid.Row="1" Margin="16,12">
+      <Grid.RowDefinitions>
+        <RowDefinition Height="Auto"/>
+        <RowDefinition Height="Auto"/>
+        <RowDefinition Height="*"/>
+      </Grid.RowDefinitions>
+
+      <ProgressBar x:Name="OverallProgressBar"
+                   Grid.Row="0"
+                   Height="8"
+                   Minimum="0"
+                   Maximum="100"
+                   Value="0"
+                   CornerRadius="4"
+                   Margin="0,0,0,16"/>
+
+      <Border Grid.Row="1"
+              Background="{DynamicResource CardBackgroundFillColorSecondaryBrush}"
+              CornerRadius="8"
+              Padding="16,12"
+              Margin="0,0,0,12">
+        <Grid RowDefinitions="Auto,Auto,Auto" ColumnDefinitions="Auto,*">
+          <Border Grid.Row="0" Grid.RowSpan="3" Grid.Column="0"
+                  Width="40"
+                  Height="40"
+                  CornerRadius="20"
+                  Background="{DynamicResource AccentFillColorDefaultBrush}"
+                  Margin="0,0,12,0"
+                  VerticalAlignment="Center">
+            <TextBlock x:Name="CurrentItemIcon"
+                       Text="&#xE768;"
+                       FontSize="20"
+                       FontFamily="{DynamicResource SymbolThemeFontFamily}"
+                       Foreground="White"
+                       HorizontalAlignment="Center"
+                       VerticalAlignment="Center"/>
+          </Border>
+
+          <TextBlock x:Name="CurrentItemName"
+                     Grid.Row="0" Grid.Column="1"
+                     Text="Initializing..."
+                     FontSize="15"
+                     FontWeight="SemiBold"
+                     Foreground="{DynamicResource TextFillColorPrimaryBrush}"/>
+
+          <TextBlock x:Name="CurrentItemDescription"
+                     Grid.Row="1" Grid.Column="1"
+                     Text="Preparing components"
+                     FontSize="13"
+                     Foreground="{DynamicResource TextFillColorSecondaryBrush}"
+                     Margin="0,4,0,0"/>
+
+          <Grid Grid.Row="2" Grid.Column="1" Margin="0,8,0,0">
+            <ProgressBar x:Name="CurrentItemProgress"
+                         Height="4"
+                         Minimum="0"
+                         Maximum="100"
+                         Value="0"
+                         CornerRadius="2"/>
+          </Grid>
+        </Grid>
+      </Border>
+
+      <Border Grid.Row="2"
+              Background="{DynamicResource CardBackgroundFillColorDefaultBrush}"
+              CornerRadius="8">
+        <Grid RowDefinitions="Auto,*">
+          <Grid Grid.Row="0" Margin="12,8" ColumnDefinitions="*,Auto,Auto">
+            <TextBlock Grid.Column="0"
+                       Text="Loading Items"
+                       FontSize="12"
+                       FontWeight="SemiBold"
+                       Foreground="{DynamicResource TextFillColorTertiaryBrush}"/>
+            <TextBlock x:Name="CompletedCountText"
+                       Grid.Column="1"
+                       Text="0"
+                       FontSize="12"
+                       Foreground="{DynamicResource TextFillColorSecondaryBrush}"
+                       Margin="0,0,4,0"/>
+            <TextBlock Grid.Column="2"
+                       Text="Done"
+                       FontSize="12"
+                       Foreground="{DynamicResource TextFillColorTertiaryBrush}"/>
+          </Grid>
+
+          <ScrollViewer Grid.Row="1"
+                        VerticalScrollBarVisibility="Auto"
+                        Margin="8,0,8,8">
+            <ItemsControl x:Name="LoadingItemsList">
+              <ItemsControl.ItemTemplate>
+                <DataTemplate DataType="views:LoadingItemViewModel">
+                  <Grid ColumnDefinitions="Auto,*,Auto,Auto"
+                        Margin="4,3"
+                        Opacity="{Binding Opacity}">
+                    <TextBlock Grid.Column="0"
+                               Text="{Binding StatusIcon}"
+                               FontSize="14"
+                               FontFamily="{DynamicResource SymbolThemeFontFamily}"
+                               Foreground="{Binding StatusColor}"
+                               Margin="0,0,8,0"
+                               VerticalAlignment="Center"/>
+
+                    <TextBlock Grid.Column="1"
+                               Text="{Binding Name}"
+                               FontSize="13"
+                               Foreground="{DynamicResource TextFillColorPrimaryBrush}"
+                               TextTrimming="CharacterEllipsis"
+                               VerticalAlignment="Center"/>
+
+                    <TextBlock Grid.Column="2"
+                               Text="{Binding ProgressText}"
+                               FontSize="12"
+                               Foreground="{DynamicResource TextFillColorSecondaryBrush}"
+                               Margin="8,0"
+                               VerticalAlignment="Center"/>
+
+                    <Border Grid.Column="3"
+                            Background="{Binding TypeBackground}"
+                            CornerRadius="4"
+                            Padding="6,2"
+                            VerticalAlignment="Center">
+                      <TextBlock Text="{Binding TypeLabel}"
+                                 FontSize="11"
+                                 Foreground="{Binding TypeForeground}"/>
+                    </Border>
+                  </Grid>
+                </DataTemplate>
+              </ItemsControl.ItemTemplate>
+            </ItemsControl>
+          </ScrollViewer>
+        </Grid>
+      </Border>
+    </Grid>
+
+    <Border x:Name="ErrorPanel"
+            Grid.Row="2"
+            Background="{DynamicResource SystemFillColorCriticalBackgroundBrush}"
+            BorderBrush="{DynamicResource SystemFillColorCriticalBrush}"
+            BorderThickness="1"
+            CornerRadius="8"
+            Padding="12,10"
+            Margin="16,0,16,12"
+            IsVisible="False">
+      <Grid ColumnDefinitions="Auto,*">
+        <TextBlock Grid.Column="0"
+                   Text="&#xE783;"
+                   FontSize="16"
+                   FontFamily="{DynamicResource SymbolThemeFontFamily}"
+                   Foreground="{DynamicResource SystemFillColorCriticalBrush}"
+                   Margin="0,0,8,0"
+                   VerticalAlignment="Center"/>
+        <TextBlock x:Name="ErrorText"
+                   Grid.Column="1"
+                   Text="An error occurred while loading."
+                   FontSize="13"
+                   Foreground="{DynamicResource SystemFillColorCriticalBrush}"
+                   TextWrapping="Wrap"/>
+      </Grid>
+    </Border>
+
+    <Border Grid.Row="3"
+            Background="{DynamicResource CardBackgroundFillColorDefaultBrush}"
+            Padding="16,12">
+      <Grid ColumnDefinitions="*,Auto">
+        <TextBlock x:Name="VersionText"
+                   Grid.Column="0"
+                   Text="v1.0.0"
+                   FontSize="12"
+                   Foreground="{DynamicResource TextFillColorTertiaryBrush}"
+                   VerticalAlignment="Center"/>
+        <StackPanel Grid.Column="1" Orientation="Horizontal" Spacing="8">
+          <Button x:Name="DetailsButton"
+                  Content="Details"
+                  Width="90"
+                  Height="32"
+                  FontSize="13"/>
+          <Button x:Name="CancelButton"
+                  Content="Cancel"
+                  Width="90"
+                  Height="32"
+                  FontSize="13"/>
+        </StackPanel>
+      </Grid>
+    </Border>
+  </Grid>
+</Window>

LanMountainDesktop.Launcher/Views/LoadingDetailsWindow.axaml.cs

@@ -0,0 +1,396 @@
+using Avalonia.Controls;
+using Avalonia.Interactivity;
+using Avalonia.Markup.Xaml;
+using Avalonia.Media;
+using Avalonia.Threading;
+using LanMountainDesktop.Launcher.Services;
+using LanMountainDesktop.Shared.Contracts.Launcher;
+using System.Collections.ObjectModel;
+using System.ComponentModel;
+
+namespace LanMountainDesktop.Launcher.Views;
+
+/// <summary>
+/// 加载详情窗口 - 显示详细的加载状态和进度
+/// </summary>
+public partial class LoadingDetailsWindow : Window
+{
+    private readonly ObservableCollection<LoadingItemViewModel> _items = new();
+    private readonly DispatcherTimer _updateTimer;
+    private DateTimeOffset _startTime;
+
+    public LoadingDetailsWindow()
+    {
+        AvaloniaXamlLoader.Load(this);
+
+        // 初始化列表
+        var itemsList = this.FindControl<ItemsControl>("LoadingItemsList");
+        if (itemsList != null)
+        {
+            itemsList.ItemsSource = _items;
+        }
+
+        // 创建更新定时器
+        _updateTimer = new DispatcherTimer
+        {
+            Interval = TimeSpan.FromMilliseconds(100)
+        };
+        _updateTimer.Tick += OnUpdateTimerTick;
+
+        _startTime = DateTimeOffset.UtcNow;
+    }
+
+    /// <summary>
+    /// 窗口加载完成
+    /// </summary>
+    protected override void OnLoaded(RoutedEventArgs e)
+    {
+        base.OnLoaded(e);
+        _updateTimer.Start();
+    }
+
+    /// <summary>
+    /// 窗口关闭
+    /// </summary>
+    protected override void OnClosing(WindowClosingEventArgs e)
+    {
+        _updateTimer.Stop();
+        base.OnClosing(e);
+    }
+
+    /// <summary>
+    /// 更新加载状态
+    /// </summary>
+    public void UpdateLoadingState(LoadingStateMessage state)
+    {
+        Dispatcher.UIThread.Post(() =>
+        {
+            try
+            {
+                // 更新标题和副标题
+                UpdateHeader(state);
+
+                // 更新整体进度
+                UpdateOverallProgress(state);
+
+                // 更新当前活动项
+                UpdateCurrentItem(state);
+
+                // 更新列表
+                UpdateItemsList(state);
+
+                // 更新错误信息
+                UpdateErrorPanel(state);
+
+                // 更新完成计数
+                UpdateCompletedCount(state);
+            }
+            catch (Exception ex)
+            {
+                Console.Error.WriteLine($"[LoadingDetailsWindow] Error updating state: {ex.Message}");
+            }
+        });
+    }
+
+    /// <summary>
+    /// 更新标题
+    /// </summary>
+    private void UpdateHeader(LoadingStateMessage state)
+    {
+        var subtitleText = this.FindControl<TextBlock>("SubtitleText");
+        if (subtitleText != null)
+        {
+            subtitleText.Text = GetStageDescription(state.Stage);
+        }
+    }
+
+    /// <summary>
+    /// 更新整体进度
+    /// </summary>
+    private void UpdateOverallProgress(LoadingStateMessage state)
+    {
+        var progressBar = this.FindControl<ProgressBar>("OverallProgressBar");
+        var percentText = this.FindControl<TextBlock>("PercentText");
+
+        if (progressBar != null)
+        {
+            progressBar.Value = state.OverallProgressPercent;
+        }
+
+        if (percentText != null)
+        {
+            percentText.Text = $"{state.OverallProgressPercent}%";
+        }
+    }
+
+    /// <summary>
+    /// 更新当前活动项
+    /// </summary>
+    private void UpdateCurrentItem(LoadingStateMessage state)
+    {
+        var currentItem = state.ActiveItems.FirstOrDefault();
+        if (currentItem == null) return;
+
+        var nameText = this.FindControl<TextBlock>("CurrentItemName");
+        var descText = this.FindControl<TextBlock>("CurrentItemDescription");
+        var progressBar = this.FindControl<ProgressBar>("CurrentItemProgress");
+        var iconText = this.FindControl<TextBlock>("CurrentItemIcon");
+
+        if (nameText != null)
+        {
+            nameText.Text = currentItem.Name;
+        }
+
+        if (descText != null)
+        {
+            descText.Text = currentItem.Message ?? GetItemDescription(currentItem);
+        }
+
+        if (progressBar != null)
+        {
+            progressBar.Value = currentItem.ProgressPercent;
+        }
+
+        if (iconText != null)
+        {
+            iconText.Text = GetItemIcon(currentItem.Type);
+        }
+    }
+
+    /// <summary>
+    /// 更新列表
+    /// </summary>
+    private void UpdateItemsList(LoadingStateMessage state)
+    {
+        // 同步列表项
+        foreach (var item in state.ActiveItems)
+        {
+            var existing = _items.FirstOrDefault(i => i.Id == item.Id);
+            if (existing != null)
+            {
+                existing.UpdateFrom(item);
+            }
+            else
+            {
+                _items.Add(new LoadingItemViewModel(item));
+            }
+        }
+
+        // 移除已完成的项（保留最近完成的5个）
+        var completedItems = _items.Where(i => i.State == LoadingState.Completed).ToList();
+        if (completedItems.Count > 5)
+        {
+            var itemsToRemove = completedItems.OrderBy(i => i.CompletedTime).Take(completedItems.Count - 5);
+            foreach (var item in itemsToRemove)
+            {
+                _items.Remove(item);
+            }
+        }
+
+        // 按状态排序：进行中 -> 等待中 -> 已完成 -> 失败
+        var sortedItems = _items.OrderBy(i => GetStatePriority(i.State)).ToList();
+        _items.Clear();
+        foreach (var item in sortedItems)
+        {
+            _items.Add(item);
+        }
+    }
+
+    /// <summary>
+    /// 更新错误面板
+    /// </summary>
+    private void UpdateErrorPanel(LoadingStateMessage state)
+    {
+        var errorPanel = this.FindControl<Border>("ErrorPanel");
+        var errorText = this.FindControl<TextBlock>("ErrorText");
+
+        if (errorPanel != null)
+        {
+            errorPanel.IsVisible = state.HasErrors;
+        }
+
+        if (errorText != null && state.ErrorMessages?.Any() == true)
+        {
+            errorText.Text = string.Join("\n", state.ErrorMessages.Take(3));
+        }
+    }
+
+    /// <summary>
+    /// 更新完成计数
+    /// </summary>
+    private void UpdateCompletedCount(LoadingStateMessage state)
+    {
+        var countText = this.FindControl<TextBlock>("CompletedCountText");
+        if (countText != null)
+        {
+            countText.Text = state.CompletedCount.ToString();
+        }
+    }
+
+    /// <summary>
+    /// 定时更新
+    /// </summary>
+    private void OnUpdateTimerTick(object? sender, EventArgs e)
+    {
+        // 可以在这里添加时间显示等实时更新
+    }
+
+    /// <summary>
+    /// 获取阶段描述
+    /// </summary>
+    private static string GetStageDescription(StartupStage stage) => stage switch
+    {
+        StartupStage.Initializing => "正在初始化系统...",
+        StartupStage.LoadingSettings => "正在加载设置...",
+        StartupStage.LoadingPlugins => "正在加载插件...",
+        StartupStage.InitializingUI => "正在初始化界面...",
+        StartupStage.Ready => "加载完成",
+        _ => "正在加载..."
+    };
+
+    /// <summary>
+    /// 获取项描述
+    /// </summary>
+    private static string GetItemDescription(LoadingItem item)
+    {
+        if (!string.IsNullOrEmpty(item.Description))
+            return item.Description;
+
+        return item.Type switch
+        {
+            LoadingItemType.Plugin => "正在加载插件...",
+            LoadingItemType.Component => "正在加载组件...",
+            LoadingItemType.Resource => "正在加载资源...",
+            LoadingItemType.Data => "正在加载数据...",
+            LoadingItemType.Network => "正在下载...",
+            _ => "正在处理..."
+        };
+    }
+
+    /// <summary>
+    /// 获取项图标
+    /// </summary>
+    private static string GetItemIcon(LoadingItemType type) => type switch
+    {
+        LoadingItemType.Plugin => "\uE768",
+        LoadingItemType.Component => "\uE7C4",
+        LoadingItemType.Resource => "\uE7C5",
+        LoadingItemType.Data => "\uE7C6",
+        LoadingItemType.Network => "\uE774",
+        LoadingItemType.Settings => "\uE713",
+        LoadingItemType.System => "\uE7C7",
+        _ => "\uE768"
+    };
+
+    /// <summary>
+    /// 获取状态优先级
+    /// </summary>
+    private static int GetStatePriority(LoadingState state) => state switch
+    {
+        LoadingState.InProgress => 0,
+        LoadingState.Pending => 1,
+        LoadingState.Completed => 2,
+        LoadingState.Failed => 3,
+        LoadingState.Timeout => 4,
+        LoadingState.Cancelled => 5,
+        _ => 6
+    };
+}
+
+/// <summary>
+/// 加载项视图模型
+/// </summary>
+public class LoadingItemViewModel : INotifyPropertyChanged
+{
+    public string Id { get; }
+    public string Name { get; private set; }
+    public LoadingItemType Type { get; private set; }
+    public LoadingState State { get; private set; }
+    public int ProgressPercent { get; private set; }
+    public DateTimeOffset? CompletedTime { get; private set; }
+
+    public string StatusIcon => GetStatusIcon(State);
+    public IBrush StatusColor => GetStatusColor(State);
+    public string ProgressText => State == LoadingState.Completed ? "完成" : $"{ProgressPercent}%";
+    public string TypeLabel => GetTypeLabel(Type);
+    public IBrush TypeBackground => GetTypeBackground(Type);
+    public IBrush TypeForeground => GetTypeForeground(Type);
+    public double Opacity => State == LoadingState.Completed ? 0.6 : 1.0;
+
+    public event PropertyChangedEventHandler? PropertyChanged;
+
+    public LoadingItemViewModel(LoadingItem item)
+    {
+        Id = item.Id;
+        UpdateFrom(item);
+    }
+
+    public void UpdateFrom(LoadingItem item)
+    {
+        Name = item.Name;
+        Type = item.Type;
+        State = item.State;
+        ProgressPercent = item.ProgressPercent;
+
+        if (State == LoadingState.Completed && !CompletedTime.HasValue)
+        {
+            CompletedTime = DateTimeOffset.UtcNow;
+        }
+
+        PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(string.Empty));
+    }
+
+    private static string GetStatusIcon(LoadingState state) => state switch
+    {
+        LoadingState.Pending => "\uE7C3",
+        LoadingState.InProgress => "\uE768",
+        LoadingState.Completed => "\uE73E",
+        LoadingState.Failed => "\uE783",
+        LoadingState.Timeout => "\uE71A",
+        LoadingState.Cancelled => "\uE711",
+        _ => "\uE7C3"
+    };
+
+    private static IBrush GetStatusColor(LoadingState state) => state switch
+    {
+        LoadingState.Pending => new SolidColorBrush(Colors.Gray),
+        LoadingState.InProgress => new SolidColorBrush(Colors.DodgerBlue),
+        LoadingState.Completed => new SolidColorBrush(Colors.Green),
+        LoadingState.Failed => new SolidColorBrush(Colors.Red),
+        LoadingState.Timeout => new SolidColorBrush(Colors.Orange),
+        LoadingState.Cancelled => new SolidColorBrush(Colors.Gray),
+        _ => new SolidColorBrush(Colors.Gray)
+    };
+
+    private static string GetTypeLabel(LoadingItemType type) => type switch
+    {
+        LoadingItemType.Plugin => "插件",
+        LoadingItemType.Component => "组件",
+        LoadingItemType.Resource => "资源",
+        LoadingItemType.Data => "数据",
+        LoadingItemType.Network => "网络",
+        LoadingItemType.Settings => "设置",
+        LoadingItemType.System => "系统",
+        _ => "其他"
+    };
+
+    private static IBrush GetTypeBackground(LoadingItemType type) => type switch
+    {
+        LoadingItemType.Plugin => new SolidColorBrush(Color.Parse("#E3F2FD")),
+        LoadingItemType.Component => new SolidColorBrush(Color.Parse("#F3E5F5")),
+        LoadingItemType.Resource => new SolidColorBrush(Color.Parse("#E8F5E9")),
+        LoadingItemType.Data => new SolidColorBrush(Color.Parse("#FFF3E0")),
+        LoadingItemType.Network => new SolidColorBrush(Color.Parse("#E0F7FA")),
+        _ => new SolidColorBrush(Color.Parse("#F5F5F5"))
+    };
+
+    private static IBrush GetTypeForeground(LoadingItemType type) => type switch
+    {
+        LoadingItemType.Plugin => new SolidColorBrush(Color.Parse("#1976D2")),
+        LoadingItemType.Component => new SolidColorBrush(Color.Parse("#7B1FA2")),
+        LoadingItemType.Resource => new SolidColorBrush(Color.Parse("#388E3C")),
+        LoadingItemType.Data => new SolidColorBrush(Color.Parse("#F57C00")),
+        LoadingItemType.Network => new SolidColorBrush(Color.Parse("#0097A7")),
+        _ => new SolidColorBrush(Color.Parse("#616161"))
+    };
+}

LanMountainDesktop.Launcher/Views/MigrationPromptWindow.axaml

@@ -0,0 +1,149 @@
+<Window xmlns="https://github.com/avaloniaui"
+        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+        xmlns:views="clr-namespace:LanMountainDesktop.Launcher.Views"
+        mc:Ignorable="d"
+        d:DesignWidth="520"
+        d:DesignHeight="360"
+        x:Class="LanMountainDesktop.Launcher.Views.MigrationPromptWindow"
+        x:DataType="views:MigrationPromptWindow"
+        Title="阑山桌面 - 版本迁移"
+        Width="520"
+        Height="360"
+        CanResize="False"
+        WindowStartupLocation="CenterScreen"
+        Background="{DynamicResource SolidBackgroundFillColorBaseBrush}"
+        TransparencyLevelHint="None"
+        Icon="/Assets/logo.ico">
+  <Design.DataContext>
+    <views:MigrationPromptWindow />
+  </Design.DataContext>
+
+  <Grid RowDefinitions="*,Auto">
+    <!-- 主内容区域 -->
+    <Grid Grid.Row="0" Margin="24,24,24,16" ColumnDefinitions="Auto,*">
+
+      <!-- 左侧：信息图标 -->
+      <Border Grid.Column="0"
+              Width="48"
+              Height="48"
+              Margin="0,4,16,0"
+              Background="{DynamicResource SystemFillColorCautionBackgroundBrush}"
+              CornerRadius="24"
+              VerticalAlignment="Top">
+        <TextBlock Text="&#xE7BA;"
+                   FontSize="24"
+                   FontFamily="{DynamicResource SymbolThemeFontFamily}"
+                   Foreground="{DynamicResource SystemFillColorCautionBrush}"
+                   HorizontalAlignment="Center"
+                   VerticalAlignment="Center"/>
+      </Border>
+
+      <!-- 右侧：内容 -->
+      <StackPanel Grid.Column="1" Spacing="12">
+        <!-- 标题 -->
+        <TextBlock Text="检测到旧版本"
+                   FontSize="18"
+                   FontWeight="SemiBold"
+                   Foreground="{DynamicResource TextFillColorPrimaryBrush}"
+                   TextWrapping="Wrap"/>
+
+        <!-- 说明文字 -->
+        <TextBlock x:Name="DescriptionText"
+                   Text="检测到您的系统中安装了旧版本的阑山桌面（0.8.4）。新版本采用了全新的架构，建议卸载旧版本以获得更好的体验。"
+                   FontSize="14"
+                   Foreground="{DynamicResource TextFillColorSecondaryBrush}"
+                   TextWrapping="Wrap"
+                   LineHeight="20"/>
+
+        <!-- 老版本信息卡片 -->
+        <Border Margin="0,8,0,0"
+                Background="{DynamicResource CardBackgroundFillColorDefaultBrush}"
+                CornerRadius="8"
+                Padding="16,12">
+          <Grid RowDefinitions="Auto,Auto,Auto" ColumnDefinitions="Auto,*">
+            <!-- 版本号 -->
+            <TextBlock Grid.Row="0" Grid.Column="0"
+                       Text="版本："
+                       FontSize="12"
+                       Foreground="{DynamicResource TextFillColorTertiaryBrush}"/>
+            <TextBlock x:Name="VersionText"
+                       Grid.Row="0" Grid.Column="1"
+                       Text="0.8.4"
+                       FontSize="12"
+                       Foreground="{DynamicResource TextFillColorSecondaryBrush}"
+                       Margin="8,0,0,0"/>
+
+            <!-- 安装路径 -->
+            <TextBlock Grid.Row="1" Grid.Column="0"
+                       Text="位置："
+                       FontSize="12"
+                       Foreground="{DynamicResource TextFillColorTertiaryBrush}"
+                       Margin="0,4,0,0"/>
+            <TextBlock x:Name="PathText"
+                       Grid.Row="1" Grid.Column="1"
+                       Text="C:\Program Files\LanMountainDesktop"
+                       FontSize="12"
+                       Foreground="{DynamicResource TextFillColorSecondaryBrush}"
+                       TextTrimming="CharacterEllipsis"
+                       Margin="8,4,0,0"/>
+
+            <!-- 安装类型 -->
+            <TextBlock Grid.Row="2" Grid.Column="0"
+                       Text="类型："
+                       FontSize="12"
+                       Foreground="{DynamicResource TextFillColorTertiaryBrush}"
+                       Margin="0,4,0,0"/>
+            <TextBlock x:Name="TypeText"
+                       Grid.Row="2" Grid.Column="1"
+                       Text="安装版"
+                       FontSize="12"
+                       Foreground="{DynamicResource TextFillColorSecondaryBrush}"
+                       Margin="8,4,0,0"/>
+          </Grid>
+        </Border>
+
+        <!-- 提示信息 -->
+        <TextBlock Text="卸载旧版本不会影响新版本的使用，您的个人数据将保留。"
+                   FontSize="12"
+                   Foreground="{DynamicResource TextFillColorTertiaryBrush}"
+                   TextWrapping="Wrap"
+                   Margin="0,4,0,0"/>
+      </StackPanel>
+    </Grid>
+
+    <!-- 底部：按钮区域 -->
+    <Border Grid.Row="1"
+            Background="{DynamicResource CardBackgroundFillColorDefaultBrush}"
+            Padding="24,16">
+      <Grid ColumnDefinitions="*,Auto">
+        <!-- 左侧：查看位置按钮 -->
+        <Button x:Name="ShowLocationButton"
+                Grid.Column="0"
+                Content="查看位置"
+                Width="100"
+                Height="32"
+                FontSize="13"
+                HorizontalAlignment="Left"/>
+
+        <!-- 右侧：操作按钮 -->
+        <StackPanel Grid.Column="1"
+                    Orientation="Horizontal"
+                    Spacing="8">
+          <Button x:Name="SkipButton"
+                  Content="暂不处理"
+                  Width="100"
+                  Height="32"
+                  FontSize="13"/>
+          <Button x:Name="UninstallButton"
+                  Content="卸载旧版本"
+                  Width="100"
+                  Height="32"
+                  FontSize="13"
+                  Theme="{DynamicResource AccentButtonTheme}"/>
+        </StackPanel>
+      </Grid>
+    </Border>
+  </Grid>
+</Window>

LanMountainDesktop.Launcher/Views/MigrationPromptWindow.axaml.cs

@@ -0,0 +1,157 @@
+using Avalonia.Controls;
+using Avalonia.Interactivity;
+using Avalonia.Markup.Xaml;
+using LanMountainDesktop.Launcher.Services;
+
+namespace LanMountainDesktop.Launcher.Views;
+
+/// <summary>
+/// 迁移提示窗口 - 提示用户卸载旧版本
+/// </summary>
+public partial class MigrationPromptWindow : Window
+{
+    private readonly TaskCompletionSource<MigrationResult> _completionSource = new();
+    private LegacyVersionInfo? _legacyInfo;
+
+    public MigrationPromptWindow()
+    {
+        AvaloniaXamlLoader.Load(this);
+        InitializeEventHandlers();
+    }
+
+    /// <summary>
+    /// 设置老版本信息
+    /// </summary>
+    public void SetLegacyInfo(LegacyVersionInfo info)
+    {
+        _legacyInfo = info;
+
+        // 更新 UI
+        var versionText = this.FindControl<TextBlock>("VersionText");
+        var pathText = this.FindControl<TextBlock>("PathText");
+        var typeText = this.FindControl<TextBlock>("TypeText");
+        var descriptionText = this.FindControl<TextBlock>("DescriptionText");
+
+        if (versionText != null)
+        {
+            versionText.Text = info.Version;
+        }
+
+        if (pathText != null)
+        {
+            pathText.Text = info.InstallPath;
+        }
+
+        if (typeText != null)
+        {
+            typeText.Text = info.InstallType switch
+            {
+                LegacyInstallType.Registry => "安装版",
+                LegacyInstallType.Portable => "便携版",
+                _ => "未知"
+            };
+        }
+
+        if (descriptionText != null)
+        {
+            descriptionText.Text = $"检测到您的系统中安装了旧版本的阑山桌面（{info.Version}）。新版本采用了全新的架构，建议卸载旧版本以获得更好的体验。";
+        }
+    }
+
+    /// <summary>
+    /// 初始化事件处理程序
+    /// </summary>
+    private void InitializeEventHandlers()
+    {
+        var showLocationButton = this.FindControl<Button>("ShowLocationButton");
+        var skipButton = this.FindControl<Button>("SkipButton");
+        var uninstallButton = this.FindControl<Button>("UninstallButton");
+
+        if (showLocationButton != null)
+        {
+            showLocationButton.Click += OnShowLocationClick;
+        }
+
+        if (skipButton != null)
+        {
+            skipButton.Click += OnSkipClick;
+        }
+
+        if (uninstallButton != null)
+        {
+            uninstallButton.Click += OnUninstallClick;
+        }
+    }
+
+    /// <summary>
+    /// 查看位置按钮点击
+    /// </summary>
+    private void OnShowLocationClick(object? sender, RoutedEventArgs e)
+    {
+        if (_legacyInfo != null)
+        {
+            LegacyVersionDetector.ShowInExplorer(_legacyInfo.InstallPath);
+        }
+    }
+
+    /// <summary>
+    /// 跳过按钮点击
+    /// </summary>
+    private void OnSkipClick(object? sender, RoutedEventArgs e)
+    {
+        _completionSource.TrySetResult(MigrationResult.Skipped);
+        Close();
+    }
+
+    /// <summary>
+    /// 卸载按钮点击
+    /// </summary>
+    private void OnUninstallClick(object? sender, RoutedEventArgs e)
+    {
+        if (_legacyInfo != null)
+        {
+            LegacyVersionDetector.OpenUninstallInterface(_legacyInfo);
+        }
+
+        _completionSource.TrySetResult(MigrationResult.UninstallOpened);
+        Close();
+    }
+
+    /// <summary>
+    /// 等待用户选择
+    /// </summary>
+    public Task<MigrationResult> WaitForChoiceAsync()
+    {
+        return _completionSource.Task;
+    }
+
+    /// <summary>
+    /// 窗口关闭事件
+    /// </summary>
+    protected override void OnClosing(WindowClosingEventArgs e)
+    {
+        // 如果还没有完成，标记为跳过
+        if (!_completionSource.Task.IsCompleted)
+        {
+            _completionSource.TrySetResult(MigrationResult.Skipped);
+        }
+
+        base.OnClosing(e);
+    }
+}
+
+/// <summary>
+/// 迁移结果
+/// </summary>
+public enum MigrationResult
+{
+    /// <summary>
+    /// 用户选择跳过
+    /// </summary>
+    Skipped,
+
+    /// <summary>
+    /// 已打开卸载界面
+    /// </summary>
+    UninstallOpened
+}

LanMountainDesktop.Launcher/Views/OobeWindow.axaml

@@ -0,0 +1,76 @@
+<Window xmlns="https://github.com/avaloniaui"
+        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+        xmlns:views="clr-namespace:LanMountainDesktop.Launcher.Views"
+        xmlns:ui="using:FluentAvalonia.UI.Controls"
+        mc:Ignorable="d"
+        d:DesignWidth="600"
+        d:DesignHeight="500"
+        x:Class="LanMountainDesktop.Launcher.Views.OobeWindow"
+        x:DataType="views:OobeWindow"
+        Title="欢迎使用阑山桌面"
+        Width="600"
+        Height="500"
+        CanResize="False"
+        WindowStartupLocation="CenterScreen"
+        Background="{DynamicResource SolidBackgroundFillColorBaseBrush}"
+        TransparencyLevelHint="None"
+        Icon="/Assets/logo.ico">
+  <Design.DataContext>
+    <views:OobeWindow />
+  </Design.DataContext>
+
+  <Grid x:Name="ContentGrid">
+    <!-- 主内容区域 -->
+    <Grid Margin="48" RowDefinitions="*,Auto">
+      <!-- 中央内容区域 -->
+      <StackPanel Grid.Row="0" 
+                  VerticalAlignment="Center" 
+                  HorizontalAlignment="Center"
+                  Spacing="24">
+        
+        <!-- 顶部：完成状态勾号图标 -->
+        <Border Width="80"
+                Height="80"
+                Background="{DynamicResource SystemFillColorSuccessBackgroundBrush}"
+                CornerRadius="40"
+                HorizontalAlignment="Center">
+          <ui:SymbolIcon Symbol="Accept"
+                         FontSize="40"
+                         Foreground="{DynamicResource SystemFillColorSuccessBrush}"
+                         HorizontalAlignment="Center"
+                         VerticalAlignment="Center"/>
+        </Border>
+        
+        <!-- 中央：欢迎文字 -->
+        <StackPanel Spacing="8" HorizontalAlignment="Center">
+          <TextBlock Text="欢迎使用阑山桌面"
+                     FontSize="28"
+                     FontWeight="SemiBold"
+                     Foreground="{DynamicResource TextFillColorPrimaryBrush}"
+                     HorizontalAlignment="Center" />
+          <TextBlock Text="你的桌面，不止一面"
+                     FontSize="14"
+                     Foreground="{DynamicResource TextFillColorSecondaryBrush}"
+                     HorizontalAlignment="Center" />
+        </StackPanel>
+        
+      </StackPanel>
+
+      <!-- 底部：圆形开始按钮 -->
+      <Button Grid.Row="1"
+              x:Name="EnterButton"
+              HorizontalAlignment="Center"
+              Width="56"
+              Height="56"
+              Margin="0,0,0,16"
+              Theme="{DynamicResource AccentButtonTheme}"
+              CornerRadius="28">
+        <ui:SymbolIcon Symbol="Forward"
+                       FontSize="24"
+                       Foreground="{DynamicResource TextOnAccentFillColorPrimaryBrush}"/>
+      </Button>
+    </Grid>
+  </Grid>
+</Window>

LanMountainDesktop.Launcher/Views/OobeWindow.axaml.cs

@@ -0,0 +1,197 @@
+using Avalonia;
+using Avalonia.Animation;
+using Avalonia.Animation.Easings;
+using Avalonia.Controls;
+using Avalonia.Interactivity;
+using Avalonia.Markup.Xaml;
+using Avalonia.Media;
+using Avalonia.Styling;
+
+namespace LanMountainDesktop.Launcher.Views;
+
+/// <summary>
+/// OOBE（首次使用体验）窗口 - 欢迎页面
+/// </summary>
+public partial class OobeWindow : Window
+{
+    private readonly TaskCompletionSource<bool> _completionSource = new();
+    private bool _isTransitioning = false;
+
+    public OobeWindow()
+    {
+        AvaloniaXamlLoader.Load(this);
+
+        // 延迟到窗口加载完成后再初始化
+        this.Loaded += OnWindowLoaded;
+        this.Opened += OnWindowOpened;
+    }
+
+    /// <summary>
+    /// 窗口加载完成事件
+    /// </summary>
+    private void OnWindowLoaded(object? sender, RoutedEventArgs e)
+    {
+        Console.WriteLine("[OobeWindow] Window loaded, initializing components...");
+
+        var enterButton = this.FindControl<Button>("EnterButton");
+        if (enterButton is not null)
+        {
+            enterButton.Click += OnEnterClick;
+            Console.WriteLine("[OobeWindow] EnterButton event bound successfully");
+        }
+        else
+        {
+            Console.Error.WriteLine("[OobeWindow] Failed to find EnterButton!");
+        }
+    }
+
+    /// <summary>
+    /// 窗口打开事件 - 播放入场动画
+    /// </summary>
+    private async void OnWindowOpened(object? sender, EventArgs e)
+    {
+        Console.WriteLine("[OobeWindow] Window opened, playing entrance animation...");
+        await PlayEntranceAnimationAsync();
+    }
+
+    /// <summary>
+    /// 播放入场动画
+    /// </summary>
+    private async Task PlayEntranceAnimationAsync()
+    {
+        try
+        {
+            // 获取内容元素
+            var contentGrid = this.FindControl<Grid>("ContentGrid");
+            if (contentGrid is null)
+            {
+                // 如果没有命名网格，直接返回
+                return;
+            }
+
+            // 创建淡入动画
+            var fadeInAnimation = new Animation
+            {
+                Duration = TimeSpan.FromMilliseconds(600),
+                Easing = new CubicEaseOut(),
+                Children =
+                {
+                    new KeyFrame
+                    {
+                        Setters = { new Setter(OpacityProperty, 0.0) },
+                        KeyTime = TimeSpan.FromMilliseconds(0)
+                    },
+                    new KeyFrame
+                    {
+                        Setters = { new Setter(OpacityProperty, 1.0) },
+                        KeyTime = TimeSpan.FromMilliseconds(600)
+                    }
+                }
+            };
+
+            // 创建向上滑动动画
+            var slideUpAnimation = new Animation
+            {
+                Duration = TimeSpan.FromMilliseconds(600),
+                Easing = new CubicEaseOut(),
+                Children =
+                {
+                    new KeyFrame
+                    {
+                        Setters = { new Setter(TranslateTransform.YProperty, 30.0) },
+                        KeyTime = TimeSpan.FromMilliseconds(0)
+                    },
+                    new KeyFrame
+                    {
+                        Setters = { new Setter(TranslateTransform.YProperty, 0.0) },
+                        KeyTime = TimeSpan.FromMilliseconds(600)
+                    }
+                }
+            };
+
+            // 应用动画
+            await fadeInAnimation.RunAsync(contentGrid);
+            await slideUpAnimation.RunAsync(contentGrid);
+
+            Console.WriteLine("[OobeWindow] Entrance animation completed");
+        }
+        catch (Exception ex)
+        {
+            Console.Error.WriteLine($"[OobeWindow] Error playing entrance animation: {ex.Message}");
+        }
+    }
+
+    /// <summary>
+    /// 等待用户点击开始按钮
+    /// </summary>
+    public Task WaitForEnterAsync() => _completionSource.Task;
+
+    /// <summary>
+    /// 进入按钮点击事件
+    /// </summary>
+    private async void OnEnterClick(object? sender, RoutedEventArgs e)
+    {
+        if (_isTransitioning) return;
+        _isTransitioning = true;
+
+        Console.WriteLine("[OobeWindow] Enter button clicked, starting transition...");
+
+        try
+        {
+            // 播放退出动画
+            await PlayExitAnimationAsync();
+
+            // 完成 OOBE
+            _completionSource.TrySetResult(true);
+        }
+        catch (Exception ex)
+        {
+            Console.Error.WriteLine($"[OobeWindow] Error during transition: {ex.Message}");
+            _completionSource.TrySetResult(true);
+        }
+    }
+
+    /// <summary>
+    /// 播放退出动画
+    /// </summary>
+    private async Task PlayExitAnimationAsync()
+    {
+        try
+        {
+            var contentGrid = this.FindControl<Grid>("ContentGrid");
+            if (contentGrid is null)
+            {
+                // 如果没有命名网格，直接延迟后返回
+                await Task.Delay(200);
+                return;
+            }
+
+            // 创建淡出动画
+            var fadeOutAnimation = new Animation
+            {
+                Duration = TimeSpan.FromMilliseconds(200),
+                Easing = new CubicEaseIn(),
+                Children =
+                {
+                    new KeyFrame
+                    {
+                        Setters = { new Setter(OpacityProperty, 1.0) },
+                        KeyTime = TimeSpan.FromMilliseconds(0)
+                    },
+                    new KeyFrame
+                    {
+                        Setters = { new Setter(OpacityProperty, 0.0) },
+                        KeyTime = TimeSpan.FromMilliseconds(200)
+                    }
+                }
+            };
+
+            await fadeOutAnimation.RunAsync(contentGrid);
+            Console.WriteLine("[OobeWindow] Exit animation completed");
+        }
+        catch (Exception ex)
+        {
+            Console.Error.WriteLine($"[OobeWindow] Error playing exit animation: {ex.Message}");
+        }
+    }
+}

LanMountainDesktop.Launcher/Views/SplashWindow.axaml

@@ -0,0 +1,87 @@
+<Window xmlns="https://github.com/avaloniaui"
+        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+        xmlns:views="clr-namespace:LanMountainDesktop.Launcher.Views"
+        xmlns:ui="using:FluentAvalonia.UI.Controls"
+        mc:Ignorable="d"
+        d:DesignWidth="480"
+        d:DesignHeight="320"
+        x:Class="LanMountainDesktop.Launcher.Views.SplashWindow"
+        x:DataType="views:SplashWindow"
+        Title="LanMountain Desktop"
+        Width="480"
+        Height="320"
+        CanResize="False"
+        WindowStartupLocation="CenterScreen"
+        SystemDecorations="None"
+        Background="{DynamicResource SolidBackgroundFillColorBaseBrush}"
+        TransparencyLevelHint="None"
+        Icon="/Assets/logo.ico">
+  <Design.DataContext>
+    <views:SplashWindow />
+  </Design.DataContext>
+
+  <Grid>
+    <!-- 左上角：应用名称 -->
+    <TextBlock x:Name="AppNameText"
+               Text="LanMountain Desktop"
+               FontSize="24"
+               FontWeight="SemiBold"
+               VerticalAlignment="Top"
+               HorizontalAlignment="Left"
+               Margin="24,24,0,0"
+               Foreground="{DynamicResource TextFillColorPrimaryBrush}" />
+
+    <!-- 底部区域：进度条和状态 -->
+    <Grid VerticalAlignment="Bottom" Margin="24,0,24,24">
+      <Grid.RowDefinitions>
+        <RowDefinition Height="Auto"/>
+        <RowDefinition Height="Auto"/>
+      </Grid.RowDefinitions>
+      
+      <!-- 第一行：左下角版本信息，右下角阶段文字 -->
+      <Grid Grid.Row="0" Margin="0,0,0,8">
+        <Grid.ColumnDefinitions>
+          <ColumnDefinition Width="*"/>
+          <ColumnDefinition Width="Auto"/>
+        </Grid.ColumnDefinitions>
+        
+        <!-- 左下角：版本和开发代号 - 可点击打开开发者界面（隐藏功能） -->
+        <Border x:Name="VersionTextBorder"
+                Grid.Column="0"
+                Background="Transparent"
+                Cursor="Hand"
+                HorizontalAlignment="Left"
+                VerticalAlignment="Bottom">
+          <TextBlock x:Name="VersionText"
+                     FontSize="11"
+                     Foreground="{DynamicResource TextFillColorSecondaryBrush}"
+                     Opacity="0.8"
+                     Text="1.0.0 (Administrate)" />
+        </Border>
+        
+        <!-- 右下角：阶段文字 -->
+        <TextBlock x:Name="StatusText"
+                   Grid.Column="1"
+                   FontSize="11"
+                   Foreground="{DynamicResource TextFillColorSecondaryBrush}"
+                   HorizontalAlignment="Right"
+                   VerticalAlignment="Bottom"
+                   Opacity="0.8"
+                   Text="Initializing..." />
+      </Grid>
+      
+      <!-- 底部：进度条 -->
+      <ProgressBar x:Name="ProgressIndicator"
+                   Grid.Row="1"
+                   Minimum="0"
+                   Maximum="100"
+                   Value="0"
+                   Height="4"
+                   IsIndeterminate="False"
+                   Foreground="{DynamicResource AccentFillColorDefaultBrush}"
+                   Background="{DynamicResource ControlStrokeColorDefaultBrush}" />
+    </Grid>
+  </Grid>
+</Window>

LanMountainDesktop.Launcher/Views/SplashWindow.axaml.cs

@@ -0,0 +1,250 @@
+using Avalonia.Controls;
+using Avalonia.Input;
+using Avalonia.Interactivity;
+using Avalonia.Markup.Xaml;
+using Avalonia.Threading;
+using LanMountainDesktop.Launcher.Services;
+
+namespace LanMountainDesktop.Launcher.Views;
+
+/// <summary>
+/// 启动画面窗口 - 简洁设计
+/// </summary>
+public partial class SplashWindow : Window, ISplashStageReporter
+{
+    private int _versionTextClickCount = 0;
+    private const int DebugModeClickThreshold = 5;
+    private bool _isDebugModeOpened = false;
+
+    public SplashWindow()
+    {
+        AvaloniaXamlLoader.Load(this);
+        
+        // 延迟到窗口加载完成后再绑定事件
+        this.Loaded += OnWindowLoaded;
+    }
+
+    /// <summary>
+    /// 窗口加载完成事件
+    /// </summary>
+    private void OnWindowLoaded(object? sender, RoutedEventArgs e)
+    {
+        Console.WriteLine("[SplashWindow] Window loaded, binding events...");
+        
+        // 绑定版本文本点击事件（隐藏功能：点击5次打开开发者界面）
+        var versionTextBorder = this.FindControl<Border>("VersionTextBorder");
+        if (versionTextBorder is not null)
+        {
+            versionTextBorder.PointerPressed += OnVersionTextClick;
+            Console.WriteLine("[SplashWindow] VersionTextBorder click event bound");
+        }
+        else
+        {
+            Console.Error.WriteLine("[SplashWindow] Failed to find VersionTextBorder!");
+        }
+    }
+
+    /// <summary>
+    /// 版本文本点击事件 - 连续点击5次打开开发者界面（隐藏功能）
+    /// </summary>
+    private void OnVersionTextClick(object? sender, PointerPressedEventArgs e)
+    {
+        if (_isDebugModeOpened) return;
+        
+        _versionTextClickCount++;
+        Console.WriteLine($"[SplashWindow] Version text clicked {_versionTextClickCount}/{DebugModeClickThreshold}");
+
+        if (_versionTextClickCount >= DebugModeClickThreshold)
+        {
+            OpenDebugWindow();
+        }
+    }
+
+    /// <summary>
+    /// 打开开发者调试窗口
+    /// </summary>
+    private async void OpenDebugWindow()
+    {
+        _isDebugModeOpened = true;
+        Console.WriteLine("[SplashWindow] Opening debug window...");
+
+        try
+        {
+            // 加载保存的状态
+            var devModeEnabled = ErrorWindow.CheckDevModeEnabled();
+            var customHostPath = ErrorWindow.GetSavedCustomHostPath();
+
+            var debugWindow = new ErrorDebugWindow(devModeEnabled, customHostPath)
+            {
+                WindowStartupLocation = WindowStartupLocation.CenterScreen
+            };
+
+            // 订阅窗口关闭事件以保存状态
+            debugWindow.Closed += (s, e) =>
+            {
+                Console.WriteLine("[SplashWindow] Debug window closed");
+                _isDebugModeOpened = false;
+                _versionTextClickCount = 0;
+            };
+
+            await debugWindow.ShowDialog(this);
+        }
+        catch (Exception ex)
+        {
+            Console.Error.WriteLine($"[SplashWindow] Error opening debug window: {ex.Message}");
+            _isDebugModeOpened = false;
+            _versionTextClickCount = 0;
+        }
+    }
+
+    /// <summary>
+    /// 更新进度和状态
+    /// </summary>
+    public void Report(string stage, string message)
+    {
+        Dispatcher.UIThread.Post(() =>
+        {
+            var statusText = this.FindControl<TextBlock>("StatusText");
+            var progressIndicator = this.FindControl<ProgressBar>("ProgressIndicator");
+            
+            if (statusText is null || progressIndicator is null)
+            {
+                Console.Error.WriteLine($"[SplashWindow] Controls not found: StatusText={statusText != null}, ProgressIndicator={progressIndicator != null}");
+                return;
+            }
+
+            // 更新状态文本
+            statusText.Text = message;
+
+            // 根据阶段更新进度
+            var progress = ResolveProgress(stage);
+            if (progress > 0)
+            {
+                progressIndicator.IsIndeterminate = false;
+                progressIndicator.Value = progress;
+            }
+            else
+            {
+                progressIndicator.IsIndeterminate = true;
+            }
+        });
+    }
+
+    /// <summary>
+    /// 更新进度（0-100）
+    /// </summary>
+    public void UpdateProgress(int percent, string? message = null)
+    {
+        Dispatcher.UIThread.Post(() =>
+        {
+            var statusText = this.FindControl<TextBlock>("StatusText");
+            var progressIndicator = this.FindControl<ProgressBar>("ProgressIndicator");
+            
+            if (statusText is null || progressIndicator is null)
+            {
+                Console.Error.WriteLine($"[SplashWindow] Controls not found in UpdateProgress");
+                return;
+            }
+
+            if (!string.IsNullOrEmpty(message))
+            {
+                statusText.Text = message;
+            }
+
+            progressIndicator.IsIndeterminate = false;
+            progressIndicator.Value = Math.Clamp(percent, 0, 100);
+        });
+    }
+
+    /// <summary>
+    /// 更新状态文本
+    /// </summary>
+    public void UpdateStatus(string message)
+    {
+        Dispatcher.UIThread.Post(() =>
+        {
+            var statusText = this.FindControl<TextBlock>("StatusText");
+            if (statusText is null)
+            {
+                Console.Error.WriteLine($"[SplashWindow] StatusText not found in UpdateStatus");
+                return;
+            }
+            statusText.Text = message;
+        });
+    }
+
+    /// <summary>
+    /// 报告阶段和进度（0-100）
+    /// </summary>
+    public void ReportStage(string stage, int progress)
+    {
+        Dispatcher.UIThread.Post(() =>
+        {
+            var statusText = this.FindControl<TextBlock>("StatusText");
+            var progressIndicator = this.FindControl<ProgressBar>("ProgressIndicator");
+            
+            if (statusText is null || progressIndicator is null)
+            {
+                Console.Error.WriteLine($"[SplashWindow] Controls not found in ReportStage");
+                return;
+            }
+
+            statusText.Text = stage;
+            progressIndicator.IsIndeterminate = false;
+            progressIndicator.Value = Math.Clamp(progress, 0, 100);
+        });
+    }
+
+    /// <summary>
+    /// 设置版本和开发代号
+    /// </summary>
+    public void SetVersionInfo(string version, string codename)
+    {
+        Dispatcher.UIThread.Post(() =>
+        {
+            var versionText = this.FindControl<TextBlock>("VersionText");
+            if (versionText is null)
+            {
+                Console.Error.WriteLine($"[SplashWindow] VersionText not found in SetVersionInfo");
+                return;
+            }
+            versionText.Text = $"{version} ({codename})";
+        });
+    }
+
+    /// <summary>
+    /// 设置调试模式
+    /// </summary>
+    public void SetDebugMode(bool isDebugMode)
+    {
+        Dispatcher.UIThread.Post(() =>
+        {
+            var statusText = this.FindControl<TextBlock>("StatusText");
+            if (statusText is null)
+            {
+                Console.Error.WriteLine($"[SplashWindow] StatusText not found in SetDebugMode");
+                return;
+            }
+            if (isDebugMode)
+            {
+                statusText.Text = "[Debug Mode] Splash Preview";
+            }
+        });
+    }
+
+    /// <summary>
+    /// 根据阶段名称解析进度值
+    /// </summary>
+    private static int ResolveProgress(string stage)
+    {
+        return stage.ToLowerInvariant() switch
+        {
+            "initializing" => 10,
+            "update" => 30,
+            "plugins" => 50,
+            "launch" => 70,
+            "ready" => 100,
+            _ => 0
+        };
+    }
+}

LanMountainDesktop.Launcher/Views/UpdateWindow.axaml

@@ -0,0 +1,108 @@
+<Window xmlns="https://github.com/avaloniaui"
+        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+        xmlns:views="clr-namespace:LanMountainDesktop.Launcher.Views"
+        mc:Ignorable="d"
+        d:DesignWidth="480"
+        d:DesignHeight="320"
+        x:Class="LanMountainDesktop.Launcher.Views.UpdateWindow"
+        x:DataType="views:UpdateWindow"
+        Title="阑山桌面 - 更新"
+        Width="480"
+        Height="320"
+        CanResize="False"
+        WindowStartupLocation="CenterScreen"
+        SystemDecorations="None"
+        Background="{DynamicResource SolidBackgroundFillColorBaseBrush}"
+        TransparencyLevelHint="None"
+        Icon="/Assets/logo.ico">
+  <Design.DataContext>
+    <views:UpdateWindow />
+  </Design.DataContext>
+
+  <Grid>
+    <!-- 顶部：应用名称和最小化按钮 -->
+    <Grid VerticalAlignment="Top" Margin="24,24,24,0">
+      <StackPanel Orientation="Horizontal" HorizontalAlignment="Left" VerticalAlignment="Center" Spacing="8">
+        <TextBlock x:Name="TitleText"
+                   Text="阑山桌面"
+                   FontSize="24"
+                   FontWeight="SemiBold"
+                   Foreground="{DynamicResource TextFillColorPrimaryBrush}" />
+        <Border Background="{DynamicResource AccentFillColorDefaultBrush}"
+                CornerRadius="4"
+                Padding="6,2"
+                VerticalAlignment="Center">
+          <TextBlock Text="Update"
+                     FontSize="11"
+                     FontWeight="SemiBold"
+                     Foreground="{DynamicResource TextOnAccentFillColorPrimaryBrush}" />
+        </Border>
+      </StackPanel>
+
+      <!-- 最小化按钮 -->
+      <Button x:Name="MinimizeButton"
+              HorizontalAlignment="Right"
+              VerticalAlignment="Center"
+              Width="32"
+              Height="32"
+              Background="Transparent"
+              BorderThickness="0">
+        <TextBlock Text="&#xE921;"
+                   FontSize="12"
+                   FontFamily="{DynamicResource SymbolThemeFontFamily}"
+                   Foreground="{DynamicResource TextFillColorSecondaryBrush}"
+                   HorizontalAlignment="Center"
+                   VerticalAlignment="Center"/>
+      </Button>
+    </Grid>
+
+    <!-- 底部区域：进度条和状态 -->
+    <Grid VerticalAlignment="Bottom" Margin="24,0,24,24">
+      <Grid.RowDefinitions>
+        <RowDefinition Height="Auto"/>
+        <RowDefinition Height="Auto"/>
+      </Grid.RowDefinitions>
+      
+      <!-- 第一行：左下角状态，右下角百分比 -->
+      <Grid Grid.Row="0" Margin="0,0,0,8">
+        <Grid.ColumnDefinitions>
+          <ColumnDefinition Width="*"/>
+          <ColumnDefinition Width="Auto"/>
+        </Grid.ColumnDefinitions>
+        
+        <!-- 左下角：状态文字 -->
+        <TextBlock x:Name="StatusText"
+                   Grid.Column="0"
+                   FontSize="11"
+                   Foreground="{DynamicResource TextFillColorSecondaryBrush}"
+                   Opacity="0.8"
+                   HorizontalAlignment="Left"
+                   VerticalAlignment="Bottom"
+                   Text="正在更新，请稍候..." />
+        
+        <!-- 右下角：百分比 -->
+        <TextBlock x:Name="PercentText"
+                   Grid.Column="1"
+                   FontSize="11"
+                   Foreground="{DynamicResource TextFillColorSecondaryBrush}"
+                   Opacity="0.8"
+                   HorizontalAlignment="Right"
+                   VerticalAlignment="Bottom"
+                   Text="0%" />
+      </Grid>
+      
+      <!-- 底部：进度条 -->
+      <ProgressBar x:Name="ProgressIndicator"
+                   Grid.Row="1"
+                   Minimum="0"
+                   Maximum="100"
+                   Value="0"
+                   Height="4"
+                   IsIndeterminate="True"
+                   Foreground="{DynamicResource AccentFillColorDefaultBrush}"
+                   Background="{DynamicResource ControlStrokeColorDefaultBrush}" />
+    </Grid>
+  </Grid>
+</Window>

LanMountainDesktop.Launcher/Views/UpdateWindow.axaml.cs

@@ -0,0 +1,123 @@
+using Avalonia.Controls;
+using Avalonia.Markup.Xaml;
+using Avalonia.Threading;
+
+namespace LanMountainDesktop.Launcher.Views;
+
+/// <summary>
+/// 更新进度窗口 - 用于 apply-update 命令模式下显示更新/插件升级进度
+/// </summary>
+public partial class UpdateWindow : Window
+{
+    public UpdateWindow()
+    {
+        AvaloniaXamlLoader.Load(this);
+        InitializeEventHandlers();
+    }
+
+    /// <summary>
+    /// 初始化事件处理程序
+    /// </summary>
+    private void InitializeEventHandlers()
+    {
+        var minimizeButton = this.FindControl<Button>("MinimizeButton");
+        if (minimizeButton != null)
+        {
+            minimizeButton.Click += (s, e) =>
+            {
+                this.WindowState = WindowState.Minimized;
+            };
+        }
+    }
+
+    /// <summary>
+    /// 更新状态和进度
+    /// </summary>
+    public void Report(string stage, string message, int progressPercent = -1)
+    {
+        Dispatcher.UIThread.Post(() =>
+        {
+            var statusText = this.FindControl<TextBlock>("StatusText");
+            var progressIndicator = this.FindControl<ProgressBar>("ProgressIndicator");
+            var percentText = this.FindControl<TextBlock>("PercentText");
+
+            if (statusText is null || progressIndicator is null || percentText is null)
+            {
+                Console.Error.WriteLine($"[UpdateWindow] Controls not found in Report: StatusText={statusText != null}, ProgressIndicator={progressIndicator != null}, PercentText={percentText != null}");
+                return;
+            }
+
+            statusText.Text = message;
+
+            if (progressPercent >= 0)
+            {
+                progressIndicator.IsIndeterminate = false;
+                progressIndicator.Value = progressPercent;
+                percentText.Text = $"{progressPercent}%";
+            }
+            else
+            {
+                progressIndicator.IsIndeterminate = true;
+                percentText.Text = "";
+            }
+        });
+    }
+
+    /// <summary>
+    /// 显示更新完成状态
+    /// </summary>
+    public void ReportComplete(bool success, string? errorMessage = null)
+    {
+        Dispatcher.UIThread.Post(() =>
+        {
+            var statusText = this.FindControl<TextBlock>("StatusText");
+            var progressIndicator = this.FindControl<ProgressBar>("ProgressIndicator");
+            var percentText = this.FindControl<TextBlock>("PercentText");
+            var titleText = this.FindControl<TextBlock>("TitleText");
+
+            if (statusText is null || progressIndicator is null || percentText is null || titleText is null)
+            {
+                Console.Error.WriteLine($"[UpdateWindow] Controls not found in ReportComplete");
+                return;
+            }
+
+            progressIndicator.IsIndeterminate = false;
+            progressIndicator.Value = 100;
+            percentText.Text = "100%";
+
+            if (success)
+            {
+                statusText.Text = "更新完成";
+            }
+            else
+            {
+                titleText.Text = "更新失败";
+                statusText.Text = errorMessage ?? "更新过程中发生错误";
+            }
+        });
+    }
+
+    /// <summary>
+    /// 设置调试模式
+    /// </summary>
+    public void SetDebugMode(bool isDebugMode)
+    {
+        Dispatcher.UIThread.Post(() =>
+        {
+            var statusText = this.FindControl<TextBlock>("StatusText");
+            var titleText = this.FindControl<TextBlock>("TitleText");
+
+            if (statusText is null || titleText is null)
+            {
+                Console.Error.WriteLine($"[UpdateWindow] Controls not found in SetDebugMode");
+                return;
+            }
+
+            if (isDebugMode)
+            {
+                titleText.Text = "[调试模式] 更新页面";
+                statusText.Text = "预览更新进度界面";
+            }
+        });
+    }
+}

LanMountainDesktop.Launcher/app.manifest

@@ -0,0 +1,25 @@
+<?xml version="1.0" encoding="utf-8"?>
+<assembly manifestVersion="1.0" xmlns="urn:schemas-microsoft-com:asm.v1">
+  <assemblyIdentity version="1.0.0.0" name="LanMountainDesktop.Launcher"/>
+  <trustInfo xmlns="urn:schemas-microsoft-com:asm.v2">
+    <security>
+      <requestedPrivileges xmlns="urn:schemas-microsoft-com:asm.v3">
+        <!-- 明确指定不需要管理员权限 -->
+        <requestedExecutionLevel level="asInvoker" uiAccess="false" />
+      </requestedPrivileges>
+    </security>
+  </trustInfo>
+  
+  <compatibility xmlns="urn:schemas-microsoft-com:compatibility.v1">
+    <application>
+      <!-- Windows 10/11 -->
+      <supportedOS Id="{8e0f7a12-bfb3-4fe8-b9a5-48fd50a15a9a}" />
+      <!-- Windows 8.1 -->
+      <supportedOS Id="{1f676c76-80e1-4239-95bb-83d0f6d0da78}" />
+      <!-- Windows 8 -->
+      <supportedOS Id="{4a2f28e3-53b9-4441-ba9c-d69d4a4a6e38}" />
+      <!-- Windows 7 -->
+      <supportedOS Id="{35138b9a-5d96-4fbd-8e2d-a2440225f93a}" />
+    </application>
+  </compatibility>
+</assembly>

LanMountainDesktop.PluginsInstallHelper/LanMountainDesktop.PluginsInstallHelper.csproj

@@ -1,14 +0,0 @@
-<Project Sdk="Microsoft.NET.Sdk" TreatAsLocalProperty="Version;PackageVersion;InformationalVersion;AssemblyVersion;FileVersion">
-  <PropertyGroup>
-    <OutputType>Exe</OutputType>
-    <TargetFramework>net10.0</TargetFramework>
-    <Nullable>enable</Nullable>
-    <ImplicitUsings>enable</ImplicitUsings>
-    <Version>1.0.0</Version>
-    <PackageVersion>$(Version)</PackageVersion>
-  </PropertyGroup>
-
-  <ItemGroup>
-    <ProjectReference Include="..\LanMountainDesktop.PluginSdk\LanMountainDesktop.PluginSdk.csproj" />
-  </ItemGroup>
-</Project>

LanMountainDesktop.PluginsInstallHelper/Program.cs

@@ -1,290 +0,0 @@
-using System.IO.Compression;
-using System.Security.Cryptography;
-using System.Text;
-using System.Text.Json;
-using LanMountainDesktop.PluginSdk;
-
-internal static class Program
-{
-    private static readonly TimeSpan[] RetryDelays =
-    [
-        TimeSpan.FromMilliseconds(120),
-        TimeSpan.FromMilliseconds(250),
-        TimeSpan.FromMilliseconds(500)
-    ];
-
-    private static async Task<int> Main(string[] args)
-    {
-        var result = new HelperResult();
-        string? resultPath = null;
-
-        try
-        {
-            var parsedArgs = ParseArgs(args);
-            if (!parsedArgs.TryGetValue("source", out var sourcePath) ||
-                !parsedArgs.TryGetValue("plugins-dir", out var pluginsDirectory) ||
-                !parsedArgs.TryGetValue("result", out resultPath) ||
-                string.IsNullOrWhiteSpace(sourcePath) ||
-                string.IsNullOrWhiteSpace(pluginsDirectory) ||
-                string.IsNullOrWhiteSpace(resultPath))
-            {
-                throw new InvalidOperationException("Required arguments: --source <path> --plugins-dir <path> --result <path>.");
-            }
-
-            var fullSourcePath = Path.GetFullPath(sourcePath);
-            var fullPluginsDirectory = Path.GetFullPath(pluginsDirectory);
-            resultPath = Path.GetFullPath(resultPath);
-
-            if (!File.Exists(fullSourcePath))
-            {
-                throw new FileNotFoundException($"Plugin package '{fullSourcePath}' was not found.", fullSourcePath);
-            }
-
-            var manifest = ReadManifestFromPackage(fullSourcePath);
-            Directory.CreateDirectory(fullPluginsDirectory);
-            var destinationPath = Path.Combine(fullPluginsDirectory, BuildInstalledPackageFileName(manifest.Id));
-            var stagingPath = destinationPath + ".incoming";
-            DeleteFileWithRetry(stagingPath);
-            CopyWithRetry(fullSourcePath, stagingPath, overwrite: true);
-            RemoveExistingPluginPackages(fullPluginsDirectory, manifest.Id, destinationPath, stagingPath);
-            MoveWithOverwriteRetry(stagingPath, destinationPath);
-
-            result = new HelperResult
-            {
-                Success = true,
-                InstalledPackagePath = destinationPath,
-                ManifestId = manifest.Id,
-                ManifestName = manifest.Name
-            };
-        }
-        catch (Exception ex)
-        {
-            result = new HelperResult
-            {
-                Success = false,
-                ErrorMessage = ex.Message
-            };
-        }
-
-        if (!string.IsNullOrWhiteSpace(resultPath))
-        {
-            var resultDirectory = Path.GetDirectoryName(resultPath);
-            if (!string.IsNullOrWhiteSpace(resultDirectory))
-            {
-                Directory.CreateDirectory(resultDirectory);
-            }
-
-            await File.WriteAllTextAsync(
-                resultPath,
-                JsonSerializer.Serialize(result, new JsonSerializerOptions
-                {
-                    WriteIndented = true
-                }),
-                Encoding.UTF8);
-        }
-
-        return result.Success ? 0 : 1;
-    }
-
-    private static Dictionary<string, string> ParseArgs(string[] args)
-    {
-        var values = new Dictionary<string, string>(StringComparer.OrdinalIgnoreCase);
-        for (var i = 0; i < args.Length; i++)
-        {
-            var current = args[i];
-            if (!current.StartsWith("--", StringComparison.Ordinal))
-            {
-                continue;
-            }
-
-            var key = current[2..];
-            if (string.IsNullOrWhiteSpace(key) || i + 1 >= args.Length)
-            {
-                continue;
-            }
-
-            values[key] = args[++i];
-        }
-
-        return values;
-    }
-
-    private static PluginManifest ReadManifestFromPackage(string packagePath)
-    {
-        using var archive = ZipFile.OpenRead(packagePath);
-        var entries = archive.Entries
-            .Where(entry => string.Equals(entry.Name, PluginSdkInfo.ManifestFileName, StringComparison.OrdinalIgnoreCase))
-            .ToArray();
-
-        if (entries.Length == 0)
-        {
-            throw new InvalidOperationException(
-                $"Plugin package '{packagePath}' does not contain '{PluginSdkInfo.ManifestFileName}'.");
-        }
-
-        if (entries.Length > 1)
-        {
-            throw new InvalidOperationException(
-                $"Plugin package '{packagePath}' contains multiple '{PluginSdkInfo.ManifestFileName}' files.");
-        }
-
-        using var stream = entries[0].Open();
-        return PluginManifest.Load(stream, $"{packagePath}!/{entries[0].FullName}");
-    }
-
-    private static void RemoveExistingPluginPackages(string pluginsDirectory, string pluginId, string destinationPath, string stagingPath)
-    {
-        var runtimeRootDirectory = EnsureTrailingSeparator(Path.Combine(Path.GetFullPath(pluginsDirectory), PluginSdkInfo.RuntimeDirectoryName));
-        var pendingDeletionDir = Path.Combine(pluginsDirectory, ".pending-deletions");
-        Directory.CreateDirectory(pendingDeletionDir);
-
-        foreach (var existingPackagePath in Directory
-                     .EnumerateFiles(pluginsDirectory, "*" + PluginSdkInfo.PackageFileExtension, SearchOption.AllDirectories)
-                     .Select(Path.GetFullPath)
-                     .Where(path => !path.StartsWith(runtimeRootDirectory, StringComparison.OrdinalIgnoreCase)))
-        {
-            try
-            {
-                if (string.Equals(existingPackagePath, Path.GetFullPath(destinationPath), StringComparison.OrdinalIgnoreCase) ||
-                    string.Equals(existingPackagePath, Path.GetFullPath(stagingPath), StringComparison.OrdinalIgnoreCase))
-                {
-                    continue;
-                }
-
-                var existingManifest = ReadManifestFromPackage(existingPackagePath);
-                if (!string.Equals(existingManifest.Id, pluginId, StringComparison.OrdinalIgnoreCase))
-                {
-                    continue;
-                }
-
-                TryRemoveExistingPackage(existingPackagePath, pendingDeletionDir);
-            }
-            catch
-            {
-                // Ignore unrelated or malformed packages while replacing an install target.
-            }
-        }
-
-        CleanupPendingDeletions(pendingDeletionDir);
-    }
-
-    private static void TryRemoveExistingPackage(string existingPackagePath, string pendingDeletionDir)
-    {
-        try
-        {
-            DeleteFileWithRetry(existingPackagePath);
-        }
-        catch (IOException)
-        {
-            var fileName = Path.GetFileName(existingPackagePath);
-            var pendingPath = Path.Combine(pendingDeletionDir, $"{fileName}.{Guid.NewGuid():N}.pending");
-            try
-            {
-                File.Move(existingPackagePath, pendingPath);
-            }
-            catch (IOException moveEx)
-            {
-                throw new IOException(
-                    $"Cannot delete or move existing plugin package '{existingPackagePath}'. " +
-                    $"The file may be in use by another process. Error: {moveEx.Message}", moveEx);
-            }
-        }
-    }
-
-    private static void CleanupPendingDeletions(string pendingDeletionDir)
-    {
-        if (!Directory.Exists(pendingDeletionDir))
-        {
-            return;
-        }
-
-        foreach (var pendingFile in Directory.EnumerateFiles(pendingDeletionDir, "*.pending"))
-        {
-            try
-            {
-                File.Delete(pendingFile);
-            }
-            catch
-            {
-                // Ignore cleanup failures for pending deletions.
-            }
-        }
-    }
-
-    private static void CopyWithRetry(string sourcePath, string destinationPath, bool overwrite)
-    {
-        Retry(() => File.Copy(sourcePath, destinationPath, overwrite));
-    }
-
-    private static void MoveWithOverwriteRetry(string sourcePath, string destinationPath)
-    {
-        Retry(() => File.Move(sourcePath, destinationPath, overwrite: true));
-    }
-
-    private static void DeleteFileWithRetry(string filePath)
-    {
-        Retry(() =>
-        {
-            if (File.Exists(filePath))
-            {
-                File.Delete(filePath);
-            }
-        });
-    }
-
-    private static void Retry(Action action)
-    {
-        Exception? lastException = null;
-
-        for (var attempt = 0; attempt <= RetryDelays.Length; attempt++)
-        {
-            try
-            {
-                action();
-                return;
-            }
-            catch (Exception ex) when (ex is IOException or UnauthorizedAccessException)
-            {
-                lastException = ex;
-                if (attempt >= RetryDelays.Length)
-                {
-                    break;
-                }
-
-                Thread.Sleep(RetryDelays[attempt]);
-            }
-        }
-
-        if (lastException is not null)
-        {
-            throw lastException;
-        }
-    }
-
-    private static string BuildInstalledPackageFileName(string pluginId)
-    {
-        var invalidChars = Path.GetInvalidFileNameChars();
-        var fileName = new string(pluginId.Select(ch => invalidChars.Contains(ch) ? '_' : ch).ToArray());
-        return fileName + PluginSdkInfo.PackageFileExtension;
-    }
-
-    private static string EnsureTrailingSeparator(string path)
-    {
-        return path.EndsWith(Path.DirectorySeparatorChar.ToString(), StringComparison.Ordinal)
-            ? path
-            : path + Path.DirectorySeparatorChar;
-    }
-
-    private sealed class HelperResult
-    {
-        public bool Success { get; init; }
-
-        public string? InstalledPackagePath { get; init; }
-
-        public string? ManifestId { get; init; }
-
-        public string? ManifestName { get; init; }
-
-        public string? ErrorMessage { get; init; }
-    }
-}

LanMountainDesktop.Shared.Contracts/Launcher/AppVersionInfo.cs

@@ -0,0 +1,22 @@
+namespace LanMountainDesktop.Shared.Contracts.Launcher;
+
+/// <summary>
+/// 应用版本信息
+/// </summary>
+public record AppVersionInfo
+{
+    /// <summary>
+    /// 版本号，如 "1.0.0"
+    /// </summary>
+    public string Version { get; init; } = "0.0.0";
+    
+    /// <summary>
+    /// 开发代号，如 "Administrate"
+    /// </summary>
+    public string Codename { get; init; } = "Unknown";
+    
+    /// <summary>
+    /// 完整版本字符串，如 "1.0.0 (Administrate)"
+    /// </summary>
+    public string FullVersionText => $"{Version} ({Codename})";
+}

LanMountainDesktop.Shared.Contracts/Launcher/HostExitCodes.cs

@@ -0,0 +1,18 @@
+namespace LanMountainDesktop.Shared.Contracts.Launcher;
+
+/// <summary>
+/// Standardized host process exit codes consumed by the launcher.
+/// </summary>
+public static class HostExitCodes
+{
+    public const int Success = 0;
+
+    // Secondary instance activated the existing primary instance successfully.
+    public const int SecondaryActivationSucceeded = 12;
+
+    // Secondary instance failed to activate the existing primary instance.
+    public const int SecondaryActivationFailed = 13;
+
+    // Restart relaunch couldn't acquire the single-instance lock in time.
+    public const int RestartLockNotAcquired = 14;
+}

LanMountainDesktop.Shared.Contracts/Launcher/LauncherIpc.cs

@@ -0,0 +1,89 @@
+namespace LanMountainDesktop.Shared.Contracts.Launcher;
+
+/// <summary>
+/// 启动阶段枚举
+/// </summary>
+public enum StartupStage
+{
+    /// <summary>
+    /// 初始化中
+    /// </summary>
+    Initializing,
+    
+    /// <summary>
+    /// 加载设置中
+    /// </summary>
+    LoadingSettings,
+    
+    /// <summary>
+    /// 加载插件中
+    /// </summary>
+    LoadingPlugins,
+    
+    /// <summary>
+    /// 初始化界面中
+    /// </summary>
+    InitializingUI,
+    
+    /// <summary>
+    /// 就绪
+    /// </summary>
+    Ready
+}
+
+/// <summary>
+/// 启动进度消息
+/// </summary>
+public record StartupProgressMessage
+{
+    /// <summary>
+    /// 当前阶段
+    /// </summary>
+    public StartupStage Stage { get; init; }
+    
+    /// <summary>
+    /// 进度百分比 (0-100)
+    /// </summary>
+    public int ProgressPercent { get; init; }
+    
+    /// <summary>
+    /// 状态消息
+    /// </summary>
+    public string? Message { get; init; }
+    
+    /// <summary>
+    /// 时间戳
+    /// </summary>
+    public DateTimeOffset Timestamp { get; init; } = DateTimeOffset.UtcNow;
+}
+
+/// <summary>
+/// Launcher IPC 常量
+/// </summary>
+public static class LauncherIpcConstants
+{
+    /// <summary>
+    /// 命名管道名称
+    /// </summary>
+    public const string PipeName = "LanMountainDesktop_Launcher";
+    
+    /// <summary>
+    /// Launcher 进程 ID 环境变量
+    /// </summary>
+    public const string LauncherPidEnvVar = "LMD_LAUNCHER_PID";
+    
+    /// <summary>
+    /// 包根目录环境变量
+    /// </summary>
+    public const string PackageRootEnvVar = "LMD_PACKAGE_ROOT";
+    
+    /// <summary>
+    /// 版本环境变量
+    /// </summary>
+    public const string VersionEnvVar = "LMD_VERSION";
+    
+    /// <summary>
+    /// 开发代号环境变量
+    /// </summary>
+    public const string CodenameEnvVar = "LMD_CODENAME";
+}

LanMountainDesktop.Shared.Contracts/Launcher/LoadingState.cs

@@ -0,0 +1,231 @@
+namespace LanMountainDesktop.Shared.Contracts.Launcher;
+
+/// <summary>
+/// 加载项类型
+/// </summary>
+public enum LoadingItemType
+{
+    /// <summary>
+    /// 系统初始化
+    /// </summary>
+    System,
+    
+    /// <summary>
+    /// 设置加载
+    /// </summary>
+    Settings,
+    
+    /// <summary>
+    /// 插件
+    /// </summary>
+    Plugin,
+    
+    /// <summary>
+    /// 组件
+    /// </summary>
+    Component,
+    
+    /// <summary>
+    /// 资源
+    /// </summary>
+    Resource,
+    
+    /// <summary>
+    /// 数据
+    /// </summary>
+    Data,
+    
+    /// <summary>
+    /// 网络请求
+    /// </summary>
+    Network,
+    
+    /// <summary>
+    /// 其他
+    /// </summary>
+    Other
+}
+
+/// <summary>
+/// 加载状态
+/// </summary>
+public enum LoadingState
+{
+    /// <summary>
+    /// 等待中
+    /// </summary>
+    Pending,
+    
+    /// <summary>
+    /// 进行中
+    /// </summary>
+    InProgress,
+    
+    /// <summary>
+    /// 已完成
+    /// </summary>
+    Completed,
+    
+    /// <summary>
+    /// 失败
+    /// </summary>
+    Failed,
+    
+    /// <summary>
+    /// 已取消
+    /// </summary>
+    Cancelled,
+    
+    /// <summary>
+    /// 超时
+    /// </summary>
+    Timeout
+}
+
+/// <summary>
+/// 加载项信息
+/// </summary>
+public record LoadingItem
+{
+    /// <summary>
+    /// 加载项唯一标识
+    /// </summary>
+    public required string Id { get; init; }
+    
+    /// <summary>
+    /// 加载项类型
+    /// </summary>
+    public LoadingItemType Type { get; init; }
+    
+    /// <summary>
+    /// 加载项名称
+    /// </summary>
+    public required string Name { get; init; }
+    
+    /// <summary>
+    /// 加载项描述
+    /// </summary>
+    public string? Description { get; init; }
+    
+    /// <summary>
+    /// 当前状态
+    /// </summary>
+    public LoadingState State { get; init; }
+    
+    /// <summary>
+    /// 进度百分比 (0-100)
+    /// </summary>
+    public int ProgressPercent { get; init; }
+    
+    /// <summary>
+    /// 状态消息
+    /// </summary>
+    public string? Message { get; init; }
+    
+    /// <summary>
+    /// 错误信息（当 State 为 Failed 时）
+    /// </summary>
+    public string? ErrorMessage { get; init; }
+    
+    /// <summary>
+    /// 开始时间
+    /// </summary>
+    public DateTimeOffset? StartTime { get; init; }
+    
+    /// <summary>
+    /// 结束时间
+    /// </summary>
+    public DateTimeOffset? EndTime { get; init; }
+    
+    /// <summary>
+    /// 预计剩余时间（秒）
+    /// </summary>
+    public int? EstimatedRemainingSeconds { get; init; }
+    
+    /// <summary>
+    /// 子加载项
+    /// </summary>
+    public List<LoadingItem>? Children { get; init; }
+    
+    /// <summary>
+    /// 额外数据
+    /// </summary>
+    public Dictionary<string, string>? Metadata { get; init; }
+    
+    /// <summary>
+    /// 时间戳
+    /// </summary>
+    public DateTimeOffset Timestamp { get; init; } = DateTimeOffset.UtcNow;
+}
+
+/// <summary>
+/// 加载状态更新消息
+/// </summary>
+public record LoadingStateMessage
+{
+    /// <summary>
+    /// 当前启动阶段
+    /// </summary>
+    public StartupStage Stage { get; init; }
+    
+    /// <summary>
+    /// 整体进度百分比 (0-100)
+    /// </summary>
+    public int OverallProgressPercent { get; init; }
+    
+    /// <summary>
+    /// 当前活动的加载项
+    /// </summary>
+    public List<LoadingItem> ActiveItems { get; init; } = new();
+    
+    /// <summary>
+    /// 已完成的加载项数量
+    /// </summary>
+    public int CompletedCount { get; init; }
+    
+    /// <summary>
+    /// 总加载项数量
+    /// </summary>
+    public int TotalCount { get; init; }
+    
+    /// <summary>
+    /// 状态消息
+    /// </summary>
+    public string? Message { get; init; }
+    
+    /// <summary>
+    /// 是否有错误
+    /// </summary>
+    public bool HasErrors { get; init; }
+    
+    /// <summary>
+    /// 错误消息列表
+    /// </summary>
+    public List<string>? ErrorMessages { get; init; }
+    
+    /// <summary>
+    /// 时间戳
+    /// </summary>
+    public DateTimeOffset Timestamp { get; init; } = DateTimeOffset.UtcNow;
+}
+
+/// <summary>
+/// 详细的加载进度消息（用于实时更新）
+/// </summary>
+public record DetailedProgressMessage : StartupProgressMessage
+{
+    /// <summary>
+    /// 当前加载项
+    /// </summary>
+    public LoadingItem? CurrentItem { get; init; }
+    
+    /// <summary>
+    /// 所有加载项
+    /// </summary>
+    public List<LoadingItem>? AllItems { get; init; }
+    
+    /// <summary>
+    /// 是否为主要更新
+    /// </summary>
+    public bool IsMajorUpdate { get; init; }
+}

LanMountainDesktop.Tests/SingleInstanceServiceTests.cs

@@ -0,0 +1,102 @@
+using System;
+using System.Reflection;
+using System.Threading;
+using System.Threading.Tasks;
+using LanMountainDesktop.Services;
+using Xunit;
+
+namespace LanMountainDesktop.Tests;
+
+public sealed class SingleInstanceServiceTests
+{
+    [Fact]
+    public async Task TryNotifyPrimaryInstance_ReturnsTrue_WhenPrimaryAcknowledges()
+    {
+        var mutexName = $"Local\\LanMountainDesktop.Tests.SingleInstance.{Guid.NewGuid():N}";
+        var pipeName = $"LanMountainDesktop.Tests.Activate.{Guid.NewGuid():N}";
+
+        using var primary = CreateService(mutexName, pipeName);
+        using var secondary = CreateSecondaryService(mutexName, pipeName);
+        Assert.True(primary.IsPrimaryInstance);
+        MarkAsSecondaryForTest(secondary);
+
+        var activated = new TaskCompletionSource(TaskCreationOptions.RunContinuationsAsynchronously);
+        primary.StartActivationListener(() => activated.TrySetResult());
+
+        var acknowledged = secondary.TryNotifyPrimaryInstance(TimeSpan.FromSeconds(2), out var failureReason);
+
+        Assert.True(acknowledged);
+        Assert.Null(failureReason);
+
+        var completed = await Task.WhenAny(activated.Task, Task.Delay(TimeSpan.FromSeconds(2)));
+        Assert.Same(activated.Task, completed);
+    }
+
+    [Fact]
+    public void TryNotifyPrimaryInstance_ReturnsFalse_WhenListenerIsNotRunning()
+    {
+        var mutexName = $"Local\\LanMountainDesktop.Tests.SingleInstance.{Guid.NewGuid():N}";
+        var pipeName = $"LanMountainDesktop.Tests.Activate.{Guid.NewGuid():N}";
+
+        using var primary = CreateService(mutexName, pipeName);
+        using var secondary = CreateSecondaryService(mutexName, pipeName);
+        Assert.True(primary.IsPrimaryInstance);
+        MarkAsSecondaryForTest(secondary);
+
+        var acknowledged = secondary.TryNotifyPrimaryInstance(TimeSpan.FromMilliseconds(300), out var failureReason);
+
+        Assert.False(acknowledged);
+        Assert.False(string.IsNullOrWhiteSpace(failureReason));
+    }
+
+    private static SingleInstanceService CreateService(string mutexName, string pipeName)
+    {
+        var ctor = typeof(SingleInstanceService).GetConstructor(
+            BindingFlags.Instance | BindingFlags.NonPublic,
+            binder: null,
+            [typeof(string), typeof(string)],
+            modifiers: null);
+
+        Assert.NotNull(ctor);
+        return (SingleInstanceService)ctor!.Invoke([mutexName, pipeName]);
+    }
+
+    private static SingleInstanceService CreateSecondaryService(string mutexName, string pipeName)
+    {
+        SingleInstanceService? created = null;
+        Exception? creationError = null;
+        var thread = new Thread(() =>
+        {
+            try
+            {
+                created = CreateService(mutexName, pipeName);
+            }
+            catch (Exception ex)
+            {
+                creationError = ex;
+            }
+        });
+
+        thread.IsBackground = true;
+        thread.Start();
+        thread.Join();
+
+        if (creationError is not null)
+        {
+            throw new InvalidOperationException("Failed to create secondary SingleInstanceService.", creationError);
+        }
+
+        Assert.NotNull(created);
+        return created!;
+    }
+
+    private static void MarkAsSecondaryForTest(SingleInstanceService service)
+    {
+        var ownsMutexField = typeof(SingleInstanceService).GetField(
+            "_ownsMutex",
+            BindingFlags.Instance | BindingFlags.NonPublic);
+        Assert.NotNull(ownsMutexField);
+        ownsMutexField!.SetValue(service, false);
+        Assert.False(service.IsPrimaryInstance);
+    }
+}

LanMountainDesktop.slnx

@@ -7,7 +7,7 @@
   <Project Path="LanMountainDesktop.DesktopHost/LanMountainDesktop.DesktopHost.csproj" />
   <Project Path="LanMountainDesktop.PluginSdk/LanMountainDesktop.PluginSdk.csproj" />
   <Project Path="LanMountainDesktop.PluginTemplate/LanMountainDesktop.PluginTemplate.csproj" />
-  <Project Path="LanMountainDesktop.PluginsInstallHelper/LanMountainDesktop.PluginsInstallHelper.csproj" />
+  <Project Path="LanMountainDesktop.Launcher/LanMountainDesktop.Launcher.csproj" />
   <Project Path="LanMountainDesktop.PluginUpgradeHelper/LanMountainDesktop.PluginUpgradeHelper.csproj" />
   <Project Path="LanMountainDesktop/LanMountainDesktop.csproj" />
   <Project Path="LanMountainDesktop.Tests/LanMountainDesktop.Tests.csproj" />

LanMountainDesktop/.github/workflows/windows-ci.yml

@@ -1,217 +0,0 @@
-name: Desktop CI
-
-on:
-  push:
-    branches:
-      - "**"
-    tags:
-      - "v*"
-  pull_request:
-  workflow_dispatch:
-    inputs:
-      version:
-        description: "Package version override (for example: 1.2.3)"
-        required: false
-        type: string
-
-concurrency:
-  group: desktop-ci-${{ github.workflow }}-${{ github.ref }}
-  cancel-in-progress: ${{ !startsWith(github.ref, 'refs/tags/v') }}
-
-env:
-  DOTNET_VERSION: "10.0.x"
-  PROJECT_PATH: "LanMountainDesktop.csproj"
-
-jobs:
-  validate:
-    name: Validate Build (Windows)
-    runs-on: windows-latest
-    timeout-minutes: 20
-    permissions:
-      contents: read
-    steps:
-      - name: Checkout
-        uses: actions/checkout@v4
-
-      - name: Setup .NET SDK
-        uses: actions/setup-dotnet@v4
-        with:
-          dotnet-version: ${{ env.DOTNET_VERSION }}
-          cache: true
-          cache-dependency-path: |
-            **/*.csproj
-
-      - name: Restore
-        run: dotnet restore .\${{ env.PROJECT_PATH }}
-
-      - name: Build
-        run: dotnet build .\${{ env.PROJECT_PATH }} -c Release --no-restore
-
-      - name: Test (if test projects exist)
-        shell: pwsh
-        run: |
-          $testProjects = @(Get-ChildItem -Path . -Recurse -Filter *.csproj | Where-Object {
-            Select-String -Path $_.FullName -Pattern '<IsTestProject>\s*true\s*</IsTestProject>|Microsoft.NET.Test.Sdk' -Quiet
-          })
-
-          if ($testProjects.Count -eq 0) {
-            Write-Host "No test projects found. Skipping dotnet test."
-            exit 0
-          }
-
-          foreach ($project in $testProjects) {
-            Write-Host "Running tests in $($project.FullName)"
-            dotnet test $project.FullName -c Release --verbosity normal
-          }
-
-  resolve_version:
-    name: Resolve Package Version
-    runs-on: ubuntu-latest
-    if: github.event_name == 'workflow_dispatch' || startsWith(github.ref, 'refs/tags/v')
-    outputs:
-      value: ${{ steps.version.outputs.value }}
-    permissions:
-      contents: read
-    steps:
-      - name: Resolve version
-        id: version
-        shell: pwsh
-        run: |
-          $manualVersion = '${{ github.event.inputs.version }}'
-          if ($manualVersion) {
-            $version = $manualVersion.Trim()
-          } elseif ($env:GITHUB_REF -like "refs/tags/v*") {
-            $version = $env:GITHUB_REF_NAME.Substring(1)
-          } elseif ($env:GITHUB_REF -like "refs/tags/*") {
-            $version = $env:GITHUB_REF_NAME
-          } else {
-            $version = "0.0.$env:GITHUB_RUN_NUMBER"
-          }
-
-          if (-not $version) {
-            throw "Failed to resolve package version."
-          }
-
-          if ($version -notmatch '^\d+\.\d+\.\d+([\-+][0-9A-Za-z\.-]+)?$') {
-            throw "Invalid version format: $version"
-          }
-
-          "value=$version" >> $env:GITHUB_OUTPUT
-          Write-Host "Using package version: $version"
-
-  package:
-    name: Package (${{ matrix.name }})
-    needs:
-      - validate
-      - resolve_version
-    if: github.event_name == 'workflow_dispatch' || startsWith(github.ref, 'refs/tags/v')
-    runs-on: ${{ matrix.runner }}
-    timeout-minutes: 60
-    strategy:
-      fail-fast: false
-      matrix:
-        include:
-          - name: Windows
-            runner: windows-latest
-            rid: win-x64
-            artifact_name: LanMountainDesktop-Setup
-            artifact_path: artifacts/installer/*.exe
-          - name: Linux
-            runner: ubuntu-latest
-            rid: linux-x64
-            artifact_name: LanMountainDesktop-linux-x64
-            artifact_path: artifacts/packages/*linux-x64*.zip
-          - name: macOS
-            runner: macos-latest
-            rid: osx-x64
-            artifact_name: LanMountainDesktop-osx-x64
-            artifact_path: artifacts/packages/*osx-x64*.zip
-    permissions:
-      contents: read
-    steps:
-      - name: Checkout
-        uses: actions/checkout@v4
-
-      - name: Setup .NET SDK
-        uses: actions/setup-dotnet@v4
-        with:
-          dotnet-version: ${{ env.DOTNET_VERSION }}
-          cache: true
-          cache-dependency-path: |
-            **/*.csproj
-
-      - name: Install Inno Setup
-        if: matrix.rid == 'win-x64'
-        shell: pwsh
-        run: |
-          if (Get-Command iscc.exe -ErrorAction SilentlyContinue) {
-            Write-Host "Inno Setup is already installed."
-            exit 0
-          }
-
-          if (Get-Command choco -ErrorAction SilentlyContinue) {
-            choco install innosetup --yes --no-progress
-          } elseif (Get-Command winget -ErrorAction SilentlyContinue) {
-            winget install --id JRSoftware.InnoSetup -e --source winget --accept-package-agreements --accept-source-agreements
-          } else {
-            throw "Neither choco nor winget is available to install Inno Setup."
-          }
-
-      - name: Build Package
-        shell: pwsh
-        run: |
-          ./scripts/package.ps1 `
-            -Configuration Release `
-            -RuntimeIdentifier ${{ matrix.rid }} `
-            -Version "${{ needs.resolve_version.outputs.value }}"
-
-      - name: Upload Package Artifact
-        uses: actions/upload-artifact@v4
-        with:
-          name: ${{ matrix.artifact_name }}-${{ needs.resolve_version.outputs.value }}
-          path: ${{ matrix.artifact_path }}
-          if-no-files-found: error
-
-      - name: Upload Windows Publish Artifact
-        if: matrix.rid == 'win-x64'
-        uses: actions/upload-artifact@v4
-        with:
-          name: LanMountainDesktop-Publish-win-x64-${{ needs.resolve_version.outputs.value }}
-          path: artifacts/publish/win-x64/**
-          if-no-files-found: error
-
-  publish_release_assets:
-    name: Attach Artifacts to GitHub Release
-    runs-on: ubuntu-latest
-    needs:
-      - package
-      - resolve_version
-    if: startsWith(github.ref, 'refs/tags/v')
-    permissions:
-      contents: write
-    steps:
-      - name: Download Windows Installer Artifact
-        uses: actions/download-artifact@v4
-        with:
-          name: LanMountainDesktop-Setup-${{ needs.resolve_version.outputs.value }}
-          path: release-assets/windows
-
-      - name: Download Linux Package Artifact
-        uses: actions/download-artifact@v4
-        with:
-          name: LanMountainDesktop-linux-x64-${{ needs.resolve_version.outputs.value }}
-          path: release-assets/linux
-
-      - name: Download macOS Package Artifact
-        uses: actions/download-artifact@v4
-        with:
-          name: LanMountainDesktop-osx-x64-${{ needs.resolve_version.outputs.value }}
-          path: release-assets/macos
-
-      - name: Attach Artifacts
-        uses: softprops/action-gh-release@v2
-        with:
-          files: |
-            release-assets/windows/*.exe
-            release-assets/linux/*.zip
-            release-assets/macos/*.zip

LanMountainDesktop/App.axaml.cs

@@ -19,7 +19,10 @@ using LanMountainDesktop.DesktopHost;
 using LanMountainDesktop.Models;
 using LanMountainDesktop.PluginSdk;
 using LanMountainDesktop.Services;
+using LanMountainDesktop.Services.Launcher;
+using LanMountainDesktop.Services.Loading;
 using LanMountainDesktop.Services.Settings;
+using LanMountainDesktop.Shared.Contracts.Launcher;
 using LanMountainDesktop.Theme;
 using LanMountainDesktop.ViewModels;
 using LanMountainDesktop.Views;
@@ -71,6 +74,11 @@ public partial class App : Application
     private bool _mainWindowClosed;
     private bool _uiUnhandledExceptionHooked;
     private DesktopShellHost? _desktopShellHost;
+    private LauncherIpcClient? _launcherIpcClient;
+    private LoadingStateManager? _loadingStateManager;
+    private LoadingStateReporter? _loadingStateReporter;
+    private bool _singleInstanceReleased;
+    private int _forcedExitScheduled;
 
     internal static SingleInstanceService? CurrentSingleInstanceService { get; set; }
     internal static IHostApplicationLifecycle? CurrentHostApplicationLifecycle =>
@@ -145,6 +153,7 @@ public partial class App : Application
         }
 
         AppLogger.Info("App", "Framework initialization completed.");
+        
         RegisterUiUnhandledExceptionGuard();
         LinuxDesktopEntryInstaller.EnsureInstalled();
         DesktopBootstrap.InitializeApplication(this, InitializeDesktopShell);
@@ -155,6 +164,104 @@ public partial class App : Application
         }
 
         base.OnFrameworkInitializationCompleted();
+        
+        // IPC 初始化移到窗口创建之后，避免 async void 中的 await 导致窗口创建延迟
+        // 使用 fire-and-forget 模式，不阻塞主流程
+        _ = InitializeLauncherIpcAsync();
+    }
+    
+    private async Task InitializeLauncherIpcAsync()
+    {
+        if (!LauncherIpcClient.IsLaunchedByLauncher())
+            return;
+        
+        try
+        {
+            _launcherIpcClient = new LauncherIpcClient();
+            var connected = await _launcherIpcClient.ConnectAsync();
+            
+            if (connected)
+            {
+                AppLogger.Info("LauncherIpc", "Connected to Launcher IPC server.");
+                
+                // 初始化加载状态管理器
+                _loadingStateManager = new LoadingStateManager();
+                _loadingStateReporter = new LoadingStateReporter(_loadingStateManager, _launcherIpcClient);
+                _loadingStateReporter.Start();
+                
+                // 注册系统初始化加载项
+                _loadingStateManager.RegisterItem("system.init", LoadingItemType.System, "系统初始化", "初始化系统核心组件");
+                _loadingStateManager.StartItem("system.init", "已连接启动器");
+                
+                ReportStartupProgress(StartupStage.Initializing, 10, "正在初始化...");
+                ReportStartupProgress(StartupStage.LoadingSettings, 20, "正在加载设置...");
+            }
+        }
+        catch (Exception ex)
+        {
+            AppLogger.Warn("LauncherIpc", $"Failed to initialize Launcher IPC: {ex.Message}");
+        }
+    }
+
+    /// <summary>
+    /// 向 Launcher 报告启动进度（fire-and-forget，不阻塞主流程）
+    /// </summary>
+    private void ReportStartupProgress(StartupStage stage, int percent, string message)
+    {
+        if (_launcherIpcClient is null)
+            return;
+
+        _ = Task.Run(async () =>
+        {
+            try
+            {
+                await _launcherIpcClient.ReportProgressAsync(new StartupProgressMessage
+                {
+                    Stage = stage,
+                    ProgressPercent = percent,
+                    Message = message
+                });
+            }
+            catch (Exception ex)
+            {
+                AppLogger.Warn("LauncherIpc", $"Failed to report progress: {ex.Message}");
+            }
+        });
+    }
+
+    /// <summary>
+    /// 向 Launcher 报告关键启动进度，使用后台线程避免阻塞 UI
+    /// 用于 Ready 等关键状态报告
+    /// </summary>
+    private void ReportStartupProgressSync(StartupStage stage, int percent, string message)
+    {
+        if (_launcherIpcClient is null)
+            return;
+
+        try
+        {
+            _ = Task.Run(async () =>
+            {
+                try
+                {
+                    await _launcherIpcClient.ReportProgressAsync(new StartupProgressMessage
+                    {
+                        Stage = stage,
+                        ProgressPercent = percent,
+                        Message = message
+                    });
+                    AppLogger.Info("LauncherIpc", $"Successfully reported stage: {stage}");
+                }
+                catch (Exception ex)
+                {
+                    AppLogger.Warn("LauncherIpc", $"Failed to report progress: {ex.Message}");
+                }
+            });
+        }
+        catch (Exception ex)
+        {
+            AppLogger.Warn("LauncherIpc", $"Failed to launch progress report task: {ex.Message}");
+        }
     }
 
     private void ApplyDesignTimeTheme()
@@ -182,18 +289,23 @@ public partial class App : Application
                 // More info: https://docs.avaloniaui.net/docs/guides/development-guides/data-validation#manage-validationplugins
                 DisableAvaloniaDataAnnotationValidation();
                 desktop.ShutdownMode = Avalonia.Controls.ShutdownMode.OnExplicitShutdown;
+                ReportStartupProgress(StartupStage.InitializingUI, 60, "正在初始化界面...");
                 CreateAndAssignMainWindow(desktop, "FrameworkInitialization");
             },
-            () =>
-            {
-                AppLogger.Info("App", "Desktop lifetime exit triggered.");
-                PerformExitCleanup();
-            },
+            OnDesktopLifetimeExit,
             () => CurrentSingleInstanceService?.StartActivationListener(ActivateMainWindow),
             StartWeatherLocationRefreshIfNeeded);
         _desktopShellHost.Initialize(this);
     }
 
+    private void OnDesktopLifetimeExit()
+    {
+        AppLogger.Info("App", "Desktop lifetime exit triggered.");
+        PerformExitCleanup();
+        ReleaseSingleInstanceAfterExit("DesktopLifetimeExit");
+        ScheduleForcedProcessTermination("DesktopLifetimeExit");
+    }
+
     private void OnTrayExitClick(object? sender, EventArgs e)
     {
         _ = _hostApplicationLifecycle.TryExit(new HostApplicationLifecycleRequest(
@@ -322,6 +434,7 @@ public partial class App : Application
 
     private void InitializePluginRuntime()
     {
+        ReportStartupProgress(StartupStage.LoadingPlugins, 30, "正在加载插件...");
         try
         {
             _pluginRuntimeService?.Dispose();
@@ -552,70 +665,102 @@ public partial class App : Application
 
     private void ActivateMainWindow()
     {
-        RestoreOrCreateMainWindow(showSingleInstanceNotice: true, source: "SingleInstance");
+        AppLogger.Info("SingleInstance", $"Activation callback received. Pid={Environment.ProcessId}.");
+
+        try
+        {
+            var restored = Dispatcher.UIThread.CheckAccess()
+                ? RestoreOrCreateMainWindowCore(showSingleInstanceNotice: true, source: "SingleInstance")
+                : Dispatcher.UIThread.InvokeAsync(
+                    () => RestoreOrCreateMainWindowCore(showSingleInstanceNotice: true, source: "SingleInstance"),
+                    DispatcherPriority.Send).GetAwaiter().GetResult();
+
+            if (!restored)
+            {
+                throw new InvalidOperationException("Main window restore failed in activation callback.");
+            }
+
+            AppLogger.Info("SingleInstance", "Activation callback completed successfully.");
+        }
+        catch (Exception ex)
+        {
+            AppLogger.Warn("SingleInstance", "Activation callback failed while restoring the desktop shell.", ex);
+            throw;
+        }
     }
 
     private void RestoreOrCreateMainWindow(bool showSingleInstanceNotice, string source)
     {
         Dispatcher.UIThread.Post(() =>
         {
-            if (ApplicationLifetime is not IClassicDesktopStyleApplicationLifetime desktop)
-            {
-                return;
-            }
-
-            try
-            {
-                if (_transparentOverlayWindow is not null && _transparentOverlayWindow.IsVisible)
-                {
-                    _transparentOverlayWindow.Hide();
-                }
-
-                var mainWindow = GetOrCreateMainWindow(desktop, source);
-                mainWindow.PrepareEnterAnimation();
-
-                mainWindow.ShowInTaskbar = true;
-
-                if (!mainWindow.IsVisible)
-                {
-                    mainWindow.Show();
-                }
-
-                if (mainWindow.WindowState == WindowState.Minimized)
-                {
-                    mainWindow.WindowState = WindowState.Normal;
-                }
-
-                if (mainWindow.WindowState != WindowState.FullScreen)
-                {
-                    mainWindow.WindowState = WindowState.FullScreen;
-                }
-
-                mainWindow.Activate();
-                mainWindow.Topmost = true;
-                mainWindow.Topmost = false;
-
-                Dispatcher.UIThread.Post(() =>
-                {
-                    mainWindow.PlayEnterAnimation();
-                }, DispatcherPriority.Background);
-
-                SetDesktopShellState(DesktopShellState.ForegroundDesktop, $"Restore:{source}");
-                AppLogger.Info(
-                    "DesktopShell",
-                    $"Desktop restored. Source='{source}'; MainWindowClosed={_mainWindowClosed}; ShowSingleInstanceNotice={showSingleInstanceNotice}; WindowState='{mainWindow.WindowState}'.");
-
-                if (showSingleInstanceNotice)
-                {
-                    mainWindow.ShowSingleInstanceNotice();
-                }
-            }
-            catch (Exception ex)
-            {
-                AppLogger.Warn("DesktopShell", $"Failed to restore desktop shell. Source='{source}'.", ex);
-            }
+            _ = RestoreOrCreateMainWindowCore(showSingleInstanceNotice, source);
         }, DispatcherPriority.Send);
     }
+
+    private bool RestoreOrCreateMainWindowCore(bool showSingleInstanceNotice, string source)
+    {
+        if (ApplicationLifetime is not IClassicDesktopStyleApplicationLifetime desktop)
+        {
+            AppLogger.Warn("DesktopShell", $"Restore skipped because desktop lifetime is unavailable. Source='{source}'.");
+            return false;
+        }
+
+        try
+        {
+            AppLogger.Info("DesktopShell", $"Restoring desktop shell started. Source='{source}'.");
+
+            if (_transparentOverlayWindow is not null && _transparentOverlayWindow.IsVisible)
+            {
+                _transparentOverlayWindow.Hide();
+            }
+
+            var mainWindow = GetOrCreateMainWindow(desktop, source);
+            mainWindow.PrepareEnterAnimation();
+
+            mainWindow.ShowInTaskbar = true;
+
+            if (!mainWindow.IsVisible)
+            {
+                mainWindow.Show();
+            }
+
+            if (mainWindow.WindowState == WindowState.Minimized)
+            {
+                mainWindow.WindowState = WindowState.Normal;
+            }
+
+            if (mainWindow.WindowState != WindowState.FullScreen)
+            {
+                mainWindow.WindowState = WindowState.FullScreen;
+            }
+
+            mainWindow.Activate();
+            mainWindow.Topmost = true;
+            mainWindow.Topmost = false;
+
+            Dispatcher.UIThread.Post(() =>
+            {
+                mainWindow.PlayEnterAnimation();
+            }, DispatcherPriority.Background);
+
+            SetDesktopShellState(DesktopShellState.ForegroundDesktop, $"Restore:{source}");
+            AppLogger.Info(
+                "DesktopShell",
+                $"Desktop restored. Source='{source}'; MainWindowClosed={_mainWindowClosed}; ShowSingleInstanceNotice={showSingleInstanceNotice}; WindowState='{mainWindow.WindowState}'.");
+
+            if (showSingleInstanceNotice)
+            {
+                mainWindow.ShowSingleInstanceNotice();
+            }
+
+            return true;
+        }
+        catch (Exception ex)
+        {
+            AppLogger.Warn("DesktopShell", $"Failed to restore desktop shell. Source='{source}'.", ex);
+            return false;
+        }
+    }
     
     private void EnsureTransparentOverlayWindow()
     {
@@ -778,6 +923,57 @@ public partial class App : Application
                stackTrace.Contains("AvaloniaWebView.WebView.OnAttachedToVisualTree", StringComparison.Ordinal);
     }
 
+    private void ReleaseSingleInstanceAfterExit(string source)
+    {
+        if (_singleInstanceReleased)
+        {
+            return;
+        }
+
+        _singleInstanceReleased = true;
+        var singleInstance = CurrentSingleInstanceService;
+        CurrentSingleInstanceService = null;
+        if (singleInstance is null)
+        {
+            AppLogger.Info("SingleInstance", $"No single-instance handle to release. Source='{source}'.");
+            return;
+        }
+
+        try
+        {
+            singleInstance.Dispose();
+            AppLogger.Info("SingleInstance", $"Released single-instance handle. Source='{source}'.");
+        }
+        catch (Exception ex)
+        {
+            AppLogger.Warn("SingleInstance", $"Failed to release single-instance handle. Source='{source}'.", ex);
+        }
+    }
+
+    private void ScheduleForcedProcessTermination(string source)
+    {
+        if (Interlocked.Exchange(ref _forcedExitScheduled, 1) != 0)
+        {
+            return;
+        }
+
+        _ = Task.Run(async () =>
+        {
+            try
+            {
+                await Task.Delay(TimeSpan.FromSeconds(8)).ConfigureAwait(false);
+                AppLogger.Warn(
+                    "DesktopShell",
+                    $"Process did not terminate after desktop exit cleanup. Forcing process exit. Source='{source}'; ShutdownIntent='{_shutdownIntent}'.");
+                Environment.Exit(0);
+            }
+            catch (Exception ex)
+            {
+                AppLogger.Warn("DesktopShell", $"Forced process termination scheduler failed. Source='{source}'.", ex);
+            }
+        });
+    }
+
     private void PerformExitCleanup()
     {
         if (_exitCleanupCompleted)
@@ -828,6 +1024,22 @@ public partial class App : Application
             disposableRegistry.Dispose();
         }
 
+        if (_transparentOverlayWindow is not null)
+        {
+            try
+            {
+                _transparentOverlayWindow.Close();
+            }
+            catch (Exception ex)
+            {
+                AppLogger.Warn("DesktopShell", "Failed to close transparent overlay during exit cleanup.", ex);
+            }
+            finally
+            {
+                _transparentOverlayWindow = null;
+            }
+        }
+
         AudioRecorderServiceFactory.DisposeSharedServices();
         StudyAnalyticsServiceFactory.DisposeSharedService();
         DisposeTrayIcon();
@@ -869,9 +1081,57 @@ public partial class App : Application
         AppLogger.Info("App", $"Main window created. Reason='{reason}'. LogFile={AppLogger.LogFilePath}");
         LogBrowserStartupDiagnostics();
         SetDesktopShellState(DesktopShellState.ForegroundDesktop, $"MainWindowCreated:{reason}");
+        
+        // 延迟报告 Ready 直到窗口实际打开并可见
+        // 使用 Opened 事件确保所有资源已加载完毕
+        mainWindow.Opened += OnMainWindowOpened;
+        
+        // 兜底机制：如果 Opened 事件 10 秒内未触发，强制发送 Ready 信号
+        // 防止因渲染问题导致 Opened 不触发，启动器 Splash 窗口一直显示
+        _ = Task.Run(async () =>
+        {
+            await Task.Delay(TimeSpan.FromSeconds(10));
+            if (_launcherIpcClient is not null && _launcherIpcClient.IsConnected)
+            {
+                try
+                {
+                    await _launcherIpcClient.ReportProgressAsync(new StartupProgressMessage
+                    {
+                        Stage = StartupStage.Ready,
+                        ProgressPercent = 100,
+                        Message = "就绪"
+                    });
+                    AppLogger.Warn("App", "Ready signal sent via fallback (Opened event did not fire within 10s)");
+                }
+                catch { }
+            }
+        });
+        
         return mainWindow;
     }
 
+    /// <summary>
+    /// 主窗口打开完成事件 - 此时所有组件、资源及功能模块均已完全加载
+    /// </summary>
+    private void OnMainWindowOpened(object? sender, EventArgs e)
+    {
+        if (sender is MainWindow mainWindow)
+        {
+            mainWindow.Opened -= OnMainWindowOpened;
+            
+            AppLogger.Info("App", "Main window opened and ready. Reporting Ready to Launcher...");
+            
+            // 完成系统初始化加载项
+            _loadingStateManager?.CompleteItem("system.init", "系统初始化完成");
+            
+            // 报告 Ready 状态，启动器可以安全关闭 Splash 窗口
+            ReportStartupProgressSync(StartupStage.Ready, 100, "就绪");
+            
+            // 停止加载状态上报
+            _loadingStateReporter?.Stop();
+        }
+    }
+
     private MainWindow GetOrCreateMainWindow(
         IClassicDesktopStyleApplicationLifetime desktop,
         string reason)
@@ -999,11 +1259,9 @@ public partial class App : Application
                 "DesktopShell",
                 $"Main window hidden to tray. Source='{source}'; WindowState='{mainWindow.WindowState}'.");
             
-            // 检查三指滑动功能是否启用
             var appSnapshot = _settingsFacade.Settings.LoadSnapshot<AppSettingsSnapshot>(SettingsScope.App);
-            if (appSnapshot.EnableThreeFingerSwipe)
+            if (appSnapshot.EnableThreeFingerSwipe && appSnapshot.EnableFusedDesktop)
             {
-                // 显示透明覆盖层窗口
                 EnsureTransparentOverlayWindow();
                 _transparentOverlayWindow?.Show();
             }

LanMountainDesktop/LanMountainDesktop.csproj

@@ -36,7 +36,7 @@
     <ProjectReference Include="..\LanMountainDesktop.DesktopComponents.Runtime\LanMountainDesktop.DesktopComponents.Runtime.csproj" />
     <ProjectReference Include="..\LanMountainDesktop.DesktopHost\LanMountainDesktop.DesktopHost.csproj" />
     <ProjectReference Include="..\LanMountainDesktop.PluginSdk\LanMountainDesktop.PluginSdk.csproj" />
-    <ProjectReference Include="..\LanMountainDesktop.PluginsInstallHelper\LanMountainDesktop.PluginsInstallHelper.csproj" ReferenceOutputAssembly="false" />
+    <!-- Launcher 引用已移除 - Launcher 现在是独立应用 -->
   </ItemGroup>
 
   <ItemGroup>
@@ -76,20 +76,31 @@
     <PackageReference Include="WebView.Avalonia" Version="11.0.0.1" />
     <PackageReference Include="WebView.Avalonia.Desktop" Version="11.0.0.1" />
     <PackageReference Include="YamlDotNet" Version="16.3.0" />
-    <PackageReference Include="Tmds.DBus.Protocol" Version="0.22.0" />
+    <PackageReference Include="Tmds.DBus.Protocol" Version="0.92.0" />
+    <PackageReference Include="log4net" Version="3.3.0" />
   </ItemGroup>
 
-  <Target Name="CopyPluginsInstallHelperToOutput" AfterTargets="Build">
-    <ItemGroup>
-      <PluginsInstallHelperFiles Include="..\LanMountainDesktop.PluginsInstallHelper\bin\$(Configuration)\net10.0\**\*.*" />
-    </ItemGroup>
-    <Copy SourceFiles="@(PluginsInstallHelperFiles)" DestinationFiles="@(PluginsInstallHelperFiles->'$(OutDir)PluginsInstallHelper\%(RecursiveDir)%(Filename)%(Extension)')" SkipUnchangedFiles="true" />
+  <!-- Launcher 构建目标已移除 - Launcher 现在是独立应用，由 CI/CD 单独构建 -->
+
+  <!-- 生成版本信息文件 -->
+  <Target Name="GenerateVersionFile" AfterTargets="Build">
+    <PropertyGroup>
+      <VersionFilePath>$(OutDir)version.json</VersionFilePath>
+      <AppVersion>$(Version)</AppVersion>
+      <AppCodename>Administrate</AppCodename>
+    </PropertyGroup>
+    <Exec Command="powershell -ExecutionPolicy Bypass -File $(MSBuildProjectDirectory)\..\scripts\Generate-VersionFile.ps1 -OutputPath '$(VersionFilePath)' -Version '$(AppVersion)' -Codename '$(AppCodename)'" Condition="'$(OS)' == 'Windows_NT'" />
+    <Exec Command="pwsh -ExecutionPolicy Bypass -File $(MSBuildProjectDirectory)\..\scripts\Generate-VersionFile.ps1 -OutputPath '$(VersionFilePath)' -Version '$(AppVersion)' -Codename '$(AppCodename)'" Condition="'$(OS)' != 'Windows_NT'" />
   </Target>
 
-  <Target Name="CopyPluginsInstallHelperToPublish" AfterTargets="Publish" Condition="'$(PublishDir)' != ''">
-    <ItemGroup>
-      <PluginsInstallHelperPublishFiles Include="..\LanMountainDesktop.PluginsInstallHelper\bin\$(Configuration)\net10.0\**\*.*" />
-    </ItemGroup>
-    <Copy SourceFiles="@(PluginsInstallHelperPublishFiles)" DestinationFiles="@(PluginsInstallHelperPublishFiles->'$(PublishDir)PluginsInstallHelper\%(RecursiveDir)%(Filename)%(Extension)')" SkipUnchangedFiles="true" />
+  <!-- 发布时也生成版本信息文件 -->
+  <Target Name="GenerateVersionFilePublish" AfterTargets="Publish">
+    <PropertyGroup>
+      <VersionFilePath>$(PublishDir)version.json</VersionFilePath>
+      <AppVersion>$(Version)</AppVersion>
+      <AppCodename>Administrate</AppCodename>
+    </PropertyGroup>
+    <Exec Command="powershell -ExecutionPolicy Bypass -File $(MSBuildProjectDirectory)\..\scripts\Generate-VersionFile.ps1 -OutputPath '$(VersionFilePath)' -Version '$(AppVersion)' -Codename '$(AppCodename)'" Condition="'$(OS)' == 'Windows_NT'" />
+    <Exec Command="pwsh -ExecutionPolicy Bypass -File $(MSBuildProjectDirectory)\..\scripts\Generate-VersionFile.ps1 -OutputPath '$(VersionFilePath)' -Version '$(AppVersion)' -Codename '$(AppCodename)'" Condition="'$(OS)' != 'Windows_NT'" />
   </Target>
 </Project>

LanMountainDesktop/Localization/en-US.json

@@ -462,6 +462,12 @@
     "settings.update.status_asset_missing":  "A new release is available, but no compatible installer was found.",
     "settings.update.status_available_format":  "New version {0} is available. Click Download & Install.",
     "settings.update.status_downloading":  "Downloading installer...",
+    "settings.update.status_downloading_delta":  "Downloading incremental update...",
+    "settings.update.status_delta_applying":  "Applying incremental update. The app will close for update.",
+    "settings.update.status_delta_launch_failed":  "Failed to launch updater for incremental update.",
+    "settings.update.type_label":  "Update Type",
+    "settings.update.type_delta":  "Incremental Update",
+    "settings.update.type_full":  "Full Installer",
     "settings.update.status_download_failed_format":  "Download failed: {0}",
     "settings.update.status_launching_installer":  "Download complete. Launching installer...",
     "settings.update.status_installer_missing":  "Installer file was not found after download.",

LanMountainDesktop/Localization/zh-CN.json

@@ -457,6 +457,12 @@
     "settings.update.status_asset_missing":  "发现新版本，但未找到兼容的安装包。",
     "settings.update.status_available_format":  "发现新版本 {0}，点击“下载并安装”继续。",
     "settings.update.status_downloading":  "正在下载安装包...",
+    "settings.update.status_downloading_delta":  "正在下载增量更新包...",
+    "settings.update.status_delta_applying":  "正在应用增量更新，应用将关闭进行更新。",
+    "settings.update.status_delta_launch_failed":  "启动增量更新程序失败。",
+    "settings.update.type_label":  "更新类型",
+    "settings.update.type_delta":  "增量更新",
+    "settings.update.type_full":  "完整安装包",
     "settings.update.status_download_failed_format":  "下载失败：{0}",
     "settings.update.status_launching_installer":  "下载完成，正在启动安装程序...",
     "settings.update.status_installer_missing":  "下载后未找到安装包文件。",

LanMountainDesktop/Models/AppSettingsSnapshot.cs

@@ -85,7 +85,7 @@ public sealed class AppSettingsSnapshot
 
     public string UpdateMode { get; set; } = "download_then_confirm";
 
-    public string UpdateDownloadSource { get; set; } = "github";
+    public string UpdateDownloadSource { get; set; } = "pdc";
 
     public int UpdateDownloadThreads { get; set; } = 4;
 

LanMountainDesktop/Program.cs

@@ -9,6 +9,7 @@ using LanMountainDesktop.Models;
 using LanMountainDesktop.Plugins;
 using LanMountainDesktop.Services;
 using LanMountainDesktop.Services.Settings;
+using LanMountainDesktop.Shared.Contracts.Launcher;
 
 namespace LanMountainDesktop;
 
@@ -32,11 +33,26 @@ public sealed class Program
                 AppLogger.Warn(
                     "Startup",
                     $"Restart relaunch could not acquire the single-instance lock. pid={restartParentProcessId.Value}. Suppressing multi-open activation prompt.");
+                Environment.ExitCode = HostExitCodes.RestartLockNotAcquired;
                 return;
             }
 
-            AppLogger.Warn("Startup", "A secondary launch was blocked because another instance is already running.");
-            _ = singleInstance.TryNotifyPrimaryInstance(TimeSpan.FromSeconds(2));
+            var activationAcknowledged = singleInstance.TryNotifyPrimaryInstance(TimeSpan.FromSeconds(2), out var failureReason);
+            if (activationAcknowledged)
+            {
+                AppLogger.Info(
+                    "Startup",
+                    $"Secondary launch forwarded to primary instance successfully. Acked={activationAcknowledged}; Pid={Environment.ProcessId}.");
+                Environment.ExitCode = HostExitCodes.SecondaryActivationSucceeded;
+            }
+            else
+            {
+                AppLogger.Warn(
+                    "Startup",
+                    $"Secondary launch failed to activate the primary instance. Acked={activationAcknowledged}; Reason='{failureReason ?? "unknown"}'; Pid={Environment.ProcessId}.");
+                Environment.ExitCode = HostExitCodes.SecondaryActivationFailed;
+            }
+
             return;
         }
 

LanMountainDesktop/Properties/launchSettings.json

@@ -0,0 +1,21 @@
+{
+  "$schema": "http://json.schemastore.org/launchsettings.json",
+  "profiles": {
+    "LanMountainDesktop (Direct)": {
+      "commandName": "Project",
+      "commandLineArgs": "",
+      "environmentVariables": {
+        "DOTNET_ENVIRONMENT": "Development"
+      }
+    },
+    "LanMountainDesktop (via Launcher)": {
+      "commandName": "Executable",
+      "executablePath": "$(SolutionDir)LanMountainDesktop.Launcher\\bin\\$(Configuration)\\net10.0\\LanMountainDesktop.Launcher.exe",
+      "commandLineArgs": "launch",
+      "workingDirectory": "$(SolutionDir)",
+      "environmentVariables": {
+        "DOTNET_ENVIRONMENT": "Development"
+      }
+    }
+  }
+}

LanMountainDesktop/Services/AppRestartService.cs

@@ -100,12 +100,15 @@ public static class AppRestartService
         var startInfo = new ProcessStartInfo
         {
             FileName = executablePath,
-            UseShellExecute = false,
+            UseShellExecute = true,
             WorkingDirectory = ResolveWorkingDirectory(executablePath, entryAssemblyPath)
         };
 
-        AppendArguments(startInfo, commandLineArgs);
-        AppendRestartParentProcessArgument(startInfo);
+        // UseShellExecute=true 时使用 Arguments 字符串而非 ArgumentList
+        var args = new System.Text.StringBuilder();
+        AppendArgumentsToString(args, commandLineArgs);
+        AppendRestartParentProcessArgumentToString(args);
+        startInfo.Arguments = args.ToString();
         return startInfo;
     }
 
@@ -122,13 +125,16 @@ public static class AppRestartService
         var startInfo = new ProcessStartInfo
         {
             FileName = dotnetHostPath,
-            UseShellExecute = false,
+            UseShellExecute = true,
             WorkingDirectory = ResolveWorkingDirectory(dotnetHostPath, entryAssemblyPath)
         };
 
-        startInfo.ArgumentList.Add(entryAssemblyPath);
-        AppendArguments(startInfo, commandLineArgs);
-        AppendRestartParentProcessArgument(startInfo);
+        // UseShellExecute=true 时使用 Arguments 字符串
+        var args = new System.Text.StringBuilder();
+        args.Append(QuoteArgument(entryAssemblyPath));
+        AppendArgumentsToString(args, commandLineArgs);
+        AppendRestartParentProcessArgumentToString(args);
+        startInfo.Arguments = args.ToString();
         return startInfo;
     }
 
@@ -145,11 +151,61 @@ public static class AppRestartService
         }
     }
 
+    private static void AppendArgumentsToString(System.Text.StringBuilder builder, IReadOnlyList<string> commandLineArgs)
+    {
+        for (var i = 1; i < commandLineArgs.Count; i++)
+        {
+            if (TryParseRestartParentProcessId(commandLineArgs[i], out _))
+            {
+                continue;
+            }
+
+            if (builder.Length > 0) builder.Append(' ');
+            builder.Append(QuoteArgument(commandLineArgs[i]));
+        }
+    }
+
     private static void AppendRestartParentProcessArgument(ProcessStartInfo startInfo)
     {
         startInfo.ArgumentList.Add($"{RestartParentPidArgumentPrefix}{Environment.ProcessId}");
     }
 
+    private static void AppendRestartParentProcessArgumentToString(System.Text.StringBuilder builder)
+    {
+        if (builder.Length > 0) builder.Append(' ');
+        builder.Append($"{RestartParentPidArgumentPrefix}{Environment.ProcessId}");
+    }
+
+    private static string QuoteArgument(string value)
+    {
+        if (string.IsNullOrEmpty(value))
+        {
+            return "\"\"";
+        }
+
+        if (!value.Contains('"') && !value.Contains(' ') && !value.Contains('\t'))
+        {
+            return value;
+        }
+
+        var builder = new System.Text.StringBuilder();
+        builder.Append('"');
+        foreach (var ch in value)
+        {
+            if (ch == '"')
+            {
+                builder.Append("\\\"");
+            }
+            else
+            {
+                builder.Append(ch);
+            }
+        }
+
+        builder.Append('"');
+        return builder.ToString();
+    }
+
     private static bool TryParseRestartParentProcessId(string? argument, out int processId)
     {
         processId = 0;

LanMountainDesktop/Services/FusedDesktopManagerService.cs

@@ -117,8 +117,9 @@ internal sealed class FusedDesktopManagerService : IFusedDesktopManagerService
             
             if (_widgetWindows.TryGetValue(placement.PlacementId, out var existingWindow))
             {
-                // 已存在，可能只更新位置或尺寸
+                // 编辑完成后，已有小窗也要同步尺寸，否则会出现“布局已保存但窗口没变”的假象。
                 existingWindow.Position = new Avalonia.PixelPoint((int)placement.X, (int)placement.Y);
+                existingWindow.UpdateComponentLayout(placement.Width, placement.Height);
                 if (existingWindow.IsVisible == false)
                 {
                     existingWindow.Show();

LanMountainDesktop/Services/Launcher/LauncherIpcClient.cs

@@ -0,0 +1,129 @@
+using System.Buffers;
+using System.Diagnostics;
+using System.IO.Pipes;
+using System.Text.Json;
+using LanMountainDesktop.Shared.Contracts.Launcher;
+
+namespace LanMountainDesktop.Services.Launcher;
+
+/// <summary>
+/// Launcher IPC 客户端 - 向 Launcher 报告启动进度
+/// 采用持久连接 + 长度前缀协议，在同一连接上可多次发送消息。
+/// 跨平台实现：Windows 使用命名管道，Linux/macOS 使用 Unix 域套接字
+/// </summary>
+public class LauncherIpcClient : IDisposable
+{
+    private NamedPipeClientStream? _pipeClient;
+    private bool _isConnected;
+    private readonly object _writeLock = new();
+
+    /// <summary>
+    /// 是否已连接到 Launcher
+    /// </summary>
+    public bool IsConnected => _isConnected && _pipeClient?.IsConnected == true;
+
+    /// <summary>
+    /// 协议：每条消息以 4 字节小端 int32 长度前缀开头，后跟 UTF-8 JSON 正文。
+    /// </summary>
+    private const int LengthPrefixSize = 4;
+
+    /// <summary>
+    /// 连接到 Launcher 的 IPC 服务端
+    /// </summary>
+    public async Task<bool> ConnectAsync(CancellationToken cancellationToken = default)
+    {
+        try
+        {
+            _pipeClient = new NamedPipeClientStream(
+                ".",
+                LauncherIpcConstants.PipeName,
+                PipeDirection.Out);
+
+            await _pipeClient.ConnectAsync(5000, cancellationToken);
+            _isConnected = true;
+            return true;
+        }
+        catch (TimeoutException)
+        {
+            // Launcher 可能没有启动 IPC 服务端，这是正常的
+            return false;
+        }
+        catch (Exception ex)
+        {
+            AppLogger.Warn("LauncherIpc", $"Failed to connect to Launcher IPC: {ex.Message}");
+            return false;
+        }
+    }
+
+    /// <summary>
+    /// 报告启动进度（在同一连接上可多次调用）
+    /// </summary>
+    public async Task ReportProgressAsync(StartupProgressMessage message)
+    {
+        if (!_isConnected || _pipeClient?.IsConnected != true)
+            return;
+
+        try
+        {
+            var json = JsonSerializer.Serialize(message);
+            var payload = System.Text.Encoding.UTF8.GetBytes(json);
+
+            // 长度前缀协议：[4字节长度][消息正文]
+            var lengthPrefix = BitConverter.GetBytes(payload.Length);
+            Debug.Assert(lengthPrefix.Length == LengthPrefixSize);
+
+            // 加锁保证单条消息的长度前缀和正文原子写入
+            lock (_writeLock)
+            {
+                _pipeClient.Write(lengthPrefix, 0, LengthPrefixSize);
+                _pipeClient.Write(payload, 0, payload.Length);
+                _pipeClient.Flush();
+            }
+
+            // 将同步写入包装为已完成的 Task
+            await Task.CompletedTask;
+        }
+        catch (IOException)
+        {
+            // 管道断开
+            _isConnected = false;
+        }
+        catch (Exception ex)
+        {
+            AppLogger.Warn("LauncherIpc", $"Failed to report progress: {ex.Message}");
+            _isConnected = false;
+        }
+    }
+
+    /// <summary>
+    /// 检查是否从 Launcher 启动
+    /// 优先检查环境变量，回退到命令行参数（UseShellExecute=true 时环境变量仍可继承，
+    /// 命令行参数作为备选确保兼容性）
+    /// </summary>
+    public static bool IsLaunchedByLauncher()
+    {
+        // 优先检查环境变量
+        if (!string.IsNullOrEmpty(
+            Environment.GetEnvironmentVariable(LauncherIpcConstants.LauncherPidEnvVar)))
+        {
+            return true;
+        }
+
+        // 回退到命令行参数检查（格式: --LMD_LAUNCHER_PID=<value>）
+        foreach (var arg in Environment.GetCommandLineArgs())
+        {
+            if (arg.StartsWith($"--{LauncherIpcConstants.LauncherPidEnvVar}=", StringComparison.OrdinalIgnoreCase))
+            {
+                return true;
+            }
+        }
+
+        return false;
+    }
+
+    public void Dispose()
+    {
+        _isConnected = false;
+        _pipeClient?.Dispose();
+    }
+}

LanMountainDesktop/Services/LauncherClient.cs

@@ -10,12 +10,12 @@ using System.Threading.Tasks;
 
 namespace LanMountainDesktop.Services;
 
-internal sealed class PluginsInstallHelperClient
+internal sealed class LauncherClient
 {
     private const int UserCanceledUacErrorCode = 1223;
-    private const string HelperExecutableName = "LanMountainDesktop.PluginsInstallHelper.exe";
+    private const string LauncherExecutableName = "LanMountainDesktop.Launcher.exe";
 
-    public async Task<PluginsInstallHelperResult> InstallPackageAsync(
+    public async Task<LauncherInstallResult> InstallPackageAsync(
         string packagePath,
         string pluginsDirectory,
         CancellationToken cancellationToken = default)
@@ -25,19 +25,19 @@ internal sealed class PluginsInstallHelperClient
 
         if (!OperatingSystem.IsWindows())
         {
-            return new PluginsInstallHelperResult(
+            return new LauncherInstallResult(
                 false,
                 null,
                 "Elevated helper install is only supported on Windows.");
         }
 
-        var helperPath = ResolveHelperPath();
-        if (!File.Exists(helperPath))
+        var launcherPath = ResolveLauncherPath();
+        if (!File.Exists(launcherPath))
         {
-            return new PluginsInstallHelperResult(
+            return new LauncherInstallResult(
                 false,
                 null,
-                $"Plugins install helper was not found at '{helperPath}'.");
+                $"Launcher executable was not found at '{launcherPath}'.");
         }
 
         var resultPath = Path.Combine(
@@ -50,38 +50,38 @@ internal sealed class PluginsInstallHelperClient
 
         try
         {
-            using var process = StartHelperProcess(helperPath, packagePath, pluginsDirectory, resultPath);
+            using var process = StartLauncherProcess(launcherPath, packagePath, pluginsDirectory, resultPath);
             if (process is null)
             {
-                return new PluginsInstallHelperResult(false, null, "Failed to start plugins install helper.");
+                return new LauncherInstallResult(false, null, "Failed to start launcher process.");
             }
 
             await process.WaitForExitAsync(cancellationToken);
             var result = await ReadResultAsync(resultPath, cancellationToken);
             if (result is not null)
             {
-                return new PluginsInstallHelperResult(result.Success, result.InstalledPackagePath, result.ErrorMessage);
+                return new LauncherInstallResult(result.Success, result.InstalledPackagePath, result.ErrorMessage);
             }
 
             if (process.ExitCode == 0)
             {
-                return new PluginsInstallHelperResult(
+                return new LauncherInstallResult(
                     false,
                     null,
-                    "Plugins install helper exited without producing a result file.");
+                    "Launcher exited without producing a result file.");
             }
 
-            return new PluginsInstallHelperResult(
+            return new LauncherInstallResult(
                 false,
                 null,
                 string.Format(
                     CultureInfo.InvariantCulture,
-                    "Plugins install helper exited with code {0}.",
+                    "Launcher exited with code {0}.",
                     process.ExitCode));
         }
         catch (Win32Exception ex) when (ex.NativeErrorCode == UserCanceledUacErrorCode)
         {
-            return new PluginsInstallHelperResult(false, null, "Administrator permission request was canceled.");
+            return new LauncherInstallResult(false, null, "Administrator permission request was canceled.");
         }
         finally
         {
@@ -89,18 +89,18 @@ internal sealed class PluginsInstallHelperClient
         }
     }
 
-    private static Process? StartHelperProcess(
-        string helperPath,
+    private static Process? StartLauncherProcess(
+        string launcherPath,
         string packagePath,
         string pluginsDirectory,
         string resultPath)
     {
         var startInfo = new ProcessStartInfo
         {
-            FileName = helperPath,
+            FileName = launcherPath,
             Verb = "runas",
             UseShellExecute = true,
-            WorkingDirectory = Path.GetDirectoryName(helperPath) ?? AppContext.BaseDirectory,
+            WorkingDirectory = Path.GetDirectoryName(launcherPath) ?? AppContext.BaseDirectory,
             Arguments = string.Create(
                 CultureInfo.InvariantCulture,
                 $"--source {QuoteArgument(Path.GetFullPath(packagePath))} --plugins-dir {QuoteArgument(Path.GetFullPath(pluginsDirectory))} --result {QuoteArgument(Path.GetFullPath(resultPath))}")
@@ -120,9 +120,9 @@ internal sealed class PluginsInstallHelperClient
         return await JsonSerializer.DeserializeAsync<HelperResultFile>(stream, cancellationToken: cancellationToken);
     }
 
-    private static string ResolveHelperPath()
+    private static string ResolveLauncherPath()
     {
-        return Path.Combine(AppContext.BaseDirectory, "PluginsInstallHelper", HelperExecutableName);
+        return Path.Combine(AppContext.BaseDirectory, "Launcher", LauncherExecutableName);
     }
 
     private static string QuoteArgument(string value)
@@ -180,7 +180,7 @@ internal sealed class PluginsInstallHelperClient
     }
 }
 
-internal sealed record PluginsInstallHelperResult(
+internal sealed record LauncherInstallResult(
     bool Success,
     string? InstalledPackagePath,
     string? ErrorMessage);

LanMountainDesktop/Services/Loading/LoadingStateManager.cs

@@ -0,0 +1,380 @@
+using System.Collections.Concurrent;
+using LanMountainDesktop.Shared.Contracts.Launcher;
+
+namespace LanMountainDesktop.Services.Loading;
+
+/// <summary>
+/// 加载状态管理器 - 管理所有加载项的状态
+/// </summary>
+public class LoadingStateManager : IDisposable
+{
+    private readonly ConcurrentDictionary<string, LoadingItem> _items = new();
+    private readonly ConcurrentDictionary<string, DateTimeOffset> _startTimes = new();
+    private readonly object _lock = new();
+    private readonly CancellationTokenSource _cts = new();
+    
+    /// <summary>
+    /// 状态变更事件
+    /// </summary>
+    public event EventHandler<LoadingStateChangedEventArgs>? StateChanged;
+    
+    /// <summary>
+    /// 整体进度变更事件
+    /// </summary>
+    public event EventHandler<OverallProgressChangedEventArgs>? OverallProgressChanged;
+    
+    /// <summary>
+    /// 当前启动阶段
+    /// </summary>
+    public StartupStage CurrentStage { get; private set; } = StartupStage.Initializing;
+    
+    /// <summary>
+    /// 整体进度百分比
+    /// </summary>
+    public int OverallProgressPercent { get; private set; }
+    
+    /// <summary>
+    /// 是否正在加载
+    /// </summary>
+    public bool IsLoading => _items.Values.Any(i => i.State == LoadingState.InProgress);
+    
+    /// <summary>
+    /// 是否有错误
+    /// </summary>
+    public bool HasErrors => _items.Values.Any(i => i.State == LoadingState.Failed);
+    
+    /// <summary>
+    /// 获取所有加载项
+    /// </summary>
+    public IReadOnlyCollection<LoadingItem> GetAllItems() => _items.Values.ToList();
+    
+    /// <summary>
+    /// 获取活动的加载项
+    /// </summary>
+    public IReadOnlyCollection<LoadingItem> GetActiveItems() => 
+        _items.Values.Where(i => i.State is LoadingState.InProgress or LoadingState.Pending).ToList();
+    
+    /// <summary>
+    /// 注册加载项
+    /// </summary>
+    public LoadingItem RegisterItem(
+        string id, 
+        LoadingItemType type, 
+        string name, 
+        string? description = null,
+        Dictionary<string, string>? metadata = null)
+    {
+        var item = new LoadingItem
+        {
+            Id = id,
+            Type = type,
+            Name = name,
+            Description = description,
+            State = LoadingState.Pending,
+            ProgressPercent = 0,
+            Metadata = metadata,
+            Timestamp = DateTimeOffset.UtcNow
+        };
+        
+        _items[id] = item;
+        
+        StateChanged?.Invoke(this, new LoadingStateChangedEventArgs 
+        { 
+            Item = item, 
+            PreviousState = null, 
+            CurrentState = item.State 
+        });
+        
+        return item;
+    }
+    
+    /// <summary>
+    /// 开始加载
+    /// </summary>
+    public void StartItem(string id, string? message = null)
+    {
+        if (!_items.TryGetValue(id, out var item))
+            return;
+        
+        var previousState = item.State;
+        var startTime = DateTimeOffset.UtcNow;
+        
+        _startTimes[id] = startTime;
+        
+        var updatedItem = item with
+        {
+            State = LoadingState.InProgress,
+            StartTime = startTime,
+            Message = message ?? $"正在加载 {item.Name}...",
+            Timestamp = DateTimeOffset.UtcNow
+        };
+        
+        _items[id] = updatedItem;
+        
+        StateChanged?.Invoke(this, new LoadingStateChangedEventArgs 
+        { 
+            Item = updatedItem, 
+            PreviousState = previousState, 
+            CurrentState = updatedItem.State 
+        });
+        
+        UpdateOverallProgress();
+    }
+    
+    /// <summary>
+    /// 更新进度
+    /// </summary>
+    public void UpdateProgress(string id, int percent, string? message = null, int? estimatedRemainingSeconds = null)
+    {
+        if (!_items.TryGetValue(id, out var item))
+            return;
+        
+        var updatedItem = item with
+        {
+            ProgressPercent = Math.Clamp(percent, 0, 100),
+            Message = message ?? item.Message,
+            EstimatedRemainingSeconds = estimatedRemainingSeconds,
+            Timestamp = DateTimeOffset.UtcNow
+        };
+        
+        _items[id] = updatedItem;
+        
+        StateChanged?.Invoke(this, new LoadingStateChangedEventArgs 
+        { 
+            Item = updatedItem, 
+            PreviousState = item.State, 
+            CurrentState = updatedItem.State,
+            IsProgressUpdate = true
+        });
+        
+        UpdateOverallProgress();
+    }
+    
+    /// <summary>
+    /// 完成加载
+    /// </summary>
+    public void CompleteItem(string id, string? message = null)
+    {
+        if (!_items.TryGetValue(id, out var item))
+            return;
+        
+        var previousState = item.State;
+        var endTime = DateTimeOffset.UtcNow;
+        
+        _startTimes.TryRemove(id, out _);
+        
+        var updatedItem = item with
+        {
+            State = LoadingState.Completed,
+            ProgressPercent = 100,
+            EndTime = endTime,
+            Message = message ?? $"{item.Name} 加载完成",
+            Timestamp = DateTimeOffset.UtcNow
+        };
+        
+        _items[id] = updatedItem;
+        
+        StateChanged?.Invoke(this, new LoadingStateChangedEventArgs 
+        { 
+            Item = updatedItem, 
+            PreviousState = previousState, 
+            CurrentState = updatedItem.State 
+        });
+        
+        UpdateOverallProgress();
+    }
+    
+    /// <summary>
+    /// 标记失败
+    /// </summary>
+    public void FailItem(string id, string errorMessage, string? details = null)
+    {
+        if (!_items.TryGetValue(id, out var item))
+            return;
+        
+        var previousState = item.State;
+        var endTime = DateTimeOffset.UtcNow;
+        
+        _startTimes.TryRemove(id, out _);
+        
+        var fullErrorMessage = string.IsNullOrEmpty(details) 
+            ? errorMessage 
+            : $"{errorMessage}: {details}";
+        
+        var updatedItem = item with
+        {
+            State = LoadingState.Failed,
+            ErrorMessage = fullErrorMessage,
+            EndTime = endTime,
+            Message = $"{item.Name} 加载失败",
+            Timestamp = DateTimeOffset.UtcNow
+        };
+        
+        _items[id] = updatedItem;
+        
+        StateChanged?.Invoke(this, new LoadingStateChangedEventArgs 
+        { 
+            Item = updatedItem, 
+            PreviousState = previousState, 
+            CurrentState = updatedItem.State 
+        });
+        
+        UpdateOverallProgress();
+    }
+    
+    /// <summary>
+    /// 标记超时
+    /// </summary>
+    public void TimeoutItem(string id, string? message = null)
+    {
+        if (!_items.TryGetValue(id, out var item))
+            return;
+        
+        var previousState = item.State;
+        var endTime = DateTimeOffset.UtcNow;
+        
+        _startTimes.TryRemove(id, out _);
+        
+        var updatedItem = item with
+        {
+            State = LoadingState.Timeout,
+            EndTime = endTime,
+            Message = message ?? $"{item.Name} 加载超时",
+            Timestamp = DateTimeOffset.UtcNow
+        };
+        
+        _items[id] = updatedItem;
+        
+        StateChanged?.Invoke(this, new LoadingStateChangedEventArgs 
+        { 
+            Item = updatedItem, 
+            PreviousState = previousState, 
+            CurrentState = updatedItem.State 
+        });
+        
+        UpdateOverallProgress();
+    }
+    
+    /// <summary>
+    /// 设置当前启动阶段
+    /// </summary>
+    public void SetStage(StartupStage stage, string? message = null)
+    {
+        CurrentStage = stage;
+        
+        OverallProgressChanged?.Invoke(this, new OverallProgressChangedEventArgs
+        {
+            Stage = stage,
+            OverallProgressPercent = OverallProgressPercent,
+            Message = message
+        });
+    }
+    
+    /// <summary>
+    /// 更新整体进度
+    /// </summary>
+    private void UpdateOverallProgress()
+    {
+        lock (_lock)
+        {
+            var items = _items.Values.ToList();
+            if (items.Count == 0)
+            {
+                OverallProgressPercent = 0;
+                return;
+            }
+            
+            // 计算加权进度
+            var totalWeight = items.Count;
+            var completedWeight = items.Count(i => i.State == LoadingState.Completed);
+            var inProgressWeight = items
+                .Where(i => i.State == LoadingState.InProgress)
+                .Sum(i => i.ProgressPercent / 100.0);
+            
+            var progress = (int)((completedWeight + inProgressWeight) / totalWeight * 100);
+            OverallProgressPercent = Math.Clamp(progress, 0, 100);
+            
+            OverallProgressChanged?.Invoke(this, new OverallProgressChangedEventArgs
+            {
+                Stage = CurrentStage,
+                OverallProgressPercent = OverallProgressPercent
+            });
+        }
+    }
+    
+    /// <summary>
+    /// 获取加载状态消息
+    /// </summary>
+    public LoadingStateMessage GetLoadingStateMessage()
+    {
+        var items = _items.Values.ToList();
+        var activeItems = items.Where(i => i.State is LoadingState.InProgress or LoadingState.Pending).ToList();
+        var errorItems = items.Where(i => i.State == LoadingState.Failed).ToList();
+        
+        return new LoadingStateMessage
+        {
+            Stage = CurrentStage,
+            OverallProgressPercent = OverallProgressPercent,
+            ActiveItems = activeItems,
+            CompletedCount = items.Count(i => i.State == LoadingState.Completed),
+            TotalCount = items.Count,
+            HasErrors = errorItems.Any(),
+            ErrorMessages = errorItems.Select(i => $"{i.Name}: {i.ErrorMessage}").ToList()
+        };
+    }
+    
+    /// <summary>
+    /// 清理所有加载项
+    /// </summary>
+    public void Clear()
+    {
+        _items.Clear();
+        _startTimes.Clear();
+        OverallProgressPercent = 0;
+    }
+    
+    /// <summary>
+    /// 检查超时项
+    /// </summary>
+    public void CheckTimeouts(TimeSpan timeout)
+    {
+        var now = DateTimeOffset.UtcNow;
+        var timeoutItems = _items.Values
+            .Where(i => i.State == LoadingState.InProgress && i.StartTime.HasValue)
+            .Where(i => now - i.StartTime.Value > timeout)
+            .ToList();
+        
+        foreach (var item in timeoutItems)
+        {
+            TimeoutItem(item.Id, $"{item.Name} 加载超时（超过 {timeout.TotalSeconds} 秒）");
+        }
+    }
+    
+    public void Dispose()
+    {
+        _cts.Cancel();
+        _items.Clear();
+        _startTimes.Clear();
+    }
+}
+
+/// <summary>
+/// 加载状态变更事件参数
+/// </summary>
+public class LoadingStateChangedEventArgs : EventArgs
+{
+    public required LoadingItem Item { get; init; }
+    public LoadingState? PreviousState { get; init; }
+    public required LoadingState CurrentState { get; init; }
+    public bool IsProgressUpdate { get; init; }
+}
+
+/// <summary>
+/// 整体进度变更事件参数
+/// </summary>
+public class OverallProgressChangedEventArgs : EventArgs
+{
+    public StartupStage Stage { get; init; }
+    public int OverallProgressPercent { get; init; }
+    public string? Message { get; init; }
+}

LanMountainDesktop/Services/Loading/LoadingStateReporter.cs

@@ -0,0 +1,360 @@
+using System.Timers;
+using LanMountainDesktop.Services.Launcher;
+using LanMountainDesktop.Shared.Contracts.Launcher;
+
+namespace LanMountainDesktop.Services.Loading;
+
+/// <summary>
+/// 加载状态上报器 - 将加载状态实时上报给 Launcher
+/// </summary>
+public class LoadingStateReporter : IDisposable
+{
+    private readonly LoadingStateManager _manager;
+    private readonly LauncherIpcClient? _ipcClient;
+    private readonly System.Timers.Timer _reportTimer;
+    private readonly object _lock = new();
+    private bool _isDisposed;
+    
+    /// <summary>
+    /// 上报间隔（毫秒）
+    /// </summary>
+    public int ReportIntervalMs { get; set; } = 100;
+    
+    /// <summary>
+    /// 是否启用批量上报优化
+    /// </summary>
+    public bool EnableBatching { get; set; } = true;
+    
+    /// <summary>
+    /// 最小上报间隔（毫秒），用于限制高频更新
+    /// </summary>
+    public int MinReportIntervalMs { get; set; } = 50;
+    
+    private DateTimeOffset _lastReportTime = DateTimeOffset.MinValue;
+    private DetailedProgressMessage? _pendingMessage;
+    private bool _hasPendingMessage;
+
+    public LoadingStateReporter(
+        LoadingStateManager manager, 
+        LauncherIpcClient? ipcClient = null)
+    {
+        _manager = manager ?? throw new ArgumentNullException(nameof(manager));
+        _ipcClient = ipcClient;
+        
+        // 创建定时上报定时器
+        _reportTimer = new System.Timers.Timer(ReportIntervalMs);
+        _reportTimer.Elapsed += OnReportTimerElapsed;
+        _reportTimer.AutoReset = true;
+        
+        // 订阅状态变更事件
+        _manager.StateChanged += OnStateChanged;
+        _manager.OverallProgressChanged += OnOverallProgressChanged;
+    }
+
+    /// <summary>
+    /// 启动上报
+    /// </summary>
+    public void Start()
+    {
+        if (_isDisposed) return;
+        
+        _reportTimer.Start();
+        AppLogger.Info("LoadingStateReporter", "Loading state reporter started");
+    }
+
+    /// <summary>
+    /// 停止上报
+    /// </summary>
+    public void Stop()
+    {
+        _reportTimer.Stop();
+        
+        // 发送任何待处理的消息
+        FlushPendingMessage();
+        
+        AppLogger.Info("LoadingStateReporter", "Loading state reporter stopped");
+    }
+
+    /// <summary>
+    /// 立即上报当前状态
+    /// </summary>
+    public async Task ReportImmediatelyAsync()
+    {
+        if (_isDisposed || _ipcClient == null) return;
+        
+        var message = CreateDetailedProgressMessage();
+        await SendMessageAsync(message);
+    }
+
+    /// <summary>
+    /// 上报单个加载项的进度
+    /// </summary>
+    public async Task ReportItemProgressAsync(string itemId, int percent, string? message = null)
+    {
+        if (_isDisposed || _ipcClient == null) return;
+        
+        var item = _manager.GetAllItems().FirstOrDefault(i => i.Id == itemId);
+        if (item == null) return;
+        
+        var updatedItem = item with
+        {
+            ProgressPercent = percent,
+            Message = message ?? item.Message,
+            Timestamp = DateTimeOffset.UtcNow
+        };
+        
+        var progressMessage = new DetailedProgressMessage
+        {
+            Stage = _manager.CurrentStage,
+            ProgressPercent = _manager.OverallProgressPercent,
+            CurrentItem = updatedItem,
+            AllItems = _manager.GetAllItems().ToList(),
+            Message = message,
+            IsMajorUpdate = false
+        };
+        
+        await SendMessageAsync(progressMessage);
+    }
+
+    /// <summary>
+    /// 上报阶段变更
+    /// </summary>
+    public async Task ReportStageChangeAsync(StartupStage stage, string? message = null)
+    {
+        if (_isDisposed || _ipcClient == null) return;
+        
+        var progressMessage = new DetailedProgressMessage
+        {
+            Stage = stage,
+            ProgressPercent = _manager.OverallProgressPercent,
+            AllItems = _manager.GetAllItems().ToList(),
+            Message = message ?? $"进入阶段: {stage}",
+            IsMajorUpdate = true
+        };
+        
+        await SendMessageAsync(progressMessage);
+    }
+
+    /// <summary>
+    /// 上报错误
+    /// </summary>
+    public async Task ReportErrorAsync(string errorMessage, string? details = null)
+    {
+        if (_isDisposed || _ipcClient == null) return;
+        
+        var fullMessage = string.IsNullOrEmpty(details) 
+            ? errorMessage 
+            : $"{errorMessage}: {details}";
+        
+        var progressMessage = new DetailedProgressMessage
+        {
+            Stage = _manager.CurrentStage,
+            ProgressPercent = _manager.OverallProgressPercent,
+            AllItems = _manager.GetAllItems().ToList(),
+            Message = fullMessage,
+            IsMajorUpdate = true
+        };
+        
+        await SendMessageAsync(progressMessage);
+    }
+
+    /// <summary>
+    /// 状态变更事件处理
+    /// </summary>
+    private void OnStateChanged(object? sender, LoadingStateChangedEventArgs e)
+    {
+        if (_isDisposed) return;
+        
+        // 重要状态变更立即上报
+        if (e.CurrentState is LoadingState.Completed or LoadingState.Failed or LoadingState.Timeout)
+        {
+            _ = Task.Run(async () =>
+            {
+                try
+                {
+                    await ReportImmediatelyAsync();
+                }
+                catch (Exception ex)
+                {
+                    AppLogger.Warn("LoadingStateReporter", $"Failed to report state change: {ex.Message}");
+                }
+            });
+        }
+        else
+        {
+            // 其他状态变更标记为待处理
+            QueueMessage(CreateDetailedProgressMessage());
+        }
+    }
+
+    /// <summary>
+    /// 整体进度变更事件处理
+    /// </summary>
+    private void OnOverallProgressChanged(object? sender, OverallProgressChangedEventArgs e)
+    {
+        if (_isDisposed) return;
+        
+        QueueMessage(CreateDetailedProgressMessage(e.Message));
+    }
+
+    /// <summary>
+    /// 定时上报处理
+    /// </summary>
+    private void OnReportTimerElapsed(object? sender, ElapsedEventArgs e)
+    {
+        FlushPendingMessage();
+    }
+
+    /// <summary>
+    /// 将消息加入待处理队列
+    /// </summary>
+    private void QueueMessage(DetailedProgressMessage message)
+    {
+        if (!EnableBatching)
+        {
+            // 如果不启用批量，立即发送
+            _ = Task.Run(async () => await SendMessageAsync(message));
+            return;
+        }
+        
+        lock (_lock)
+        {
+            _pendingMessage = message;
+            _hasPendingMessage = true;
+        }
+    }
+
+    /// <summary>
+    /// 刷新待处理消息
+    /// </summary>
+    private void FlushPendingMessage()
+    {
+        DetailedProgressMessage? message;
+        
+        lock (_lock)
+        {
+            if (!_hasPendingMessage) return;
+            
+            message = _pendingMessage;
+            _pendingMessage = null;
+            _hasPendingMessage = false;
+        }
+        
+        if (message != null)
+        {
+            _ = Task.Run(async () =>
+            {
+                try
+                {
+                    await SendMessageAsync(message);
+                }
+                catch (Exception ex)
+                {
+                    AppLogger.Warn("LoadingStateReporter", $"Failed to flush pending message: {ex.Message}");
+                }
+            });
+        }
+    }
+
+    /// <summary>
+    /// 创建详细的进度消息
+    /// </summary>
+    private DetailedProgressMessage CreateDetailedProgressMessage(string? message = null)
+    {
+        var activeItems = _manager.GetActiveItems().ToList();
+        var currentItem = activeItems.FirstOrDefault();
+        
+        return new DetailedProgressMessage
+        {
+            Stage = _manager.CurrentStage,
+            ProgressPercent = _manager.OverallProgressPercent,
+            CurrentItem = currentItem,
+            AllItems = _manager.GetAllItems().ToList(),
+            Message = message ?? currentItem?.Message,
+            IsMajorUpdate = false
+        };
+    }
+
+    /// <summary>
+    /// 发送消息
+    /// </summary>
+    private async Task SendMessageAsync(DetailedProgressMessage message)
+    {
+        if (_ipcClient == null) return;
+        
+        // 检查最小上报间隔
+        var now = DateTimeOffset.UtcNow;
+        var elapsed = now - _lastReportTime;
+        if (elapsed.TotalMilliseconds < MinReportIntervalMs)
+        {
+            await Task.Delay(MinReportIntervalMs - (int)elapsed.TotalMilliseconds);
+        }
+        
+        try
+        {
+            // 转换为 StartupProgressMessage 以保持兼容性
+            var baseMessage = new StartupProgressMessage
+            {
+                Stage = message.Stage,
+                ProgressPercent = message.ProgressPercent,
+                Message = FormatMessage(message),
+                Timestamp = DateTimeOffset.UtcNow
+            };
+            
+            await _ipcClient.ReportProgressAsync(baseMessage);
+            _lastReportTime = DateTimeOffset.UtcNow;
+        }
+        catch (Exception ex)
+        {
+            AppLogger.Warn("LoadingStateReporter", $"Failed to send message: {ex.Message}");
+        }
+    }
+
+    /// <summary>
+    /// 格式化消息
+    /// </summary>
+    private string FormatMessage(DetailedProgressMessage message)
+    {
+        var parts = new List<string>();
+        
+        if (message.CurrentItem != null)
+        {
+            parts.Add($"[{message.CurrentItem.Type}] {message.CurrentItem.Name}");
+            
+            if (message.CurrentItem.ProgressPercent > 0)
+            {
+                parts.Add($"{message.CurrentItem.ProgressPercent}%");
+            }
+        }
+        
+        if (!string.IsNullOrEmpty(message.Message))
+        {
+            parts.Add(message.Message);
+        }
+        
+        var completedCount = message.AllItems?.Count(i => i.State == LoadingState.Completed) ?? 0;
+        var totalCount = message.AllItems?.Count ?? 0;
+        
+        if (totalCount > 0)
+        {
+            parts.Add($"({completedCount}/{totalCount})");
+        }
+        
+        return string.Join(" - ", parts);
+    }
+
+    public void Dispose()
+    {
+        if (_isDisposed) return;
+        
+        _isDisposed = true;
+        
+        Stop();
+        
+        _reportTimer.Elapsed -= OnReportTimerElapsed;
+        _reportTimer.Dispose();
+        
+        _manager.StateChanged -= OnStateChanged;
+        _manager.OverallProgressChanged -= OnOverallProgressChanged;
+    }
+}

LanMountainDesktop/Services/Loading/LoadingStateUsageExample.cs

@@ -0,0 +1,201 @@
+using LanMountainDesktop.Shared.Contracts.Launcher;
+
+namespace LanMountainDesktop.Services.Loading;
+
+/// <summary>
+/// 加载状态管理使用示例
+/// </summary>
+public static class LoadingStateUsageExample
+{
+    /// <summary>
+    /// 示例：插件加载
+    /// </summary>
+    public static async Task LoadPluginsExample(LoadingStateManager manager)
+    {
+        // 注册插件加载项
+        var pluginItem = manager.RegisterItem(
+            "plugins.core",
+            LoadingItemType.Plugin,
+            "核心插件",
+            "加载系统核心插件",
+            new Dictionary<string, string> { { "version", "1.0.0" } });
+
+        // 开始加载
+        manager.StartItem("plugins.core", "正在下载插件...");
+
+        try
+        {
+            // 模拟下载进度
+            for (int i = 0; i <= 100; i += 10)
+            {
+                manager.UpdateProgress(
+                    "plugins.core",
+                    i,
+                    $"正在下载... {i}%",
+                    estimatedRemainingSeconds: (100 - i) / 10);
+
+                await Task.Delay(100);
+            }
+
+            // 完成加载
+            manager.CompleteItem("plugins.core", "核心插件加载完成");
+        }
+        catch (Exception ex)
+        {
+            // 标记失败
+            manager.FailItem("plugins.core", "插件加载失败", ex.Message);
+        }
+    }
+
+    /// <summary>
+    /// 示例：组件加载
+    /// </summary>
+    public static async Task LoadComponentsExample(LoadingStateManager manager)
+    {
+        var components = new[]
+        {
+            ("comp.weather", "天气组件"),
+            ("comp.clock", "时钟组件"),
+            ("comp.calendar", "日历组件")
+        };
+
+        foreach (var (id, name) in components)
+        {
+            // 注册组件
+            manager.RegisterItem(id, LoadingItemType.Component, name);
+
+            // 开始加载
+            manager.StartItem(id, $"正在加载 {name}...");
+
+            // 模拟加载过程
+            for (int i = 0; i <= 100; i += 20)
+            {
+                manager.UpdateProgress(id, i);
+                await Task.Delay(50);
+            }
+
+            // 完成
+            manager.CompleteItem(id, $"{name} 加载完成");
+        }
+    }
+
+    /// <summary>
+    /// 示例：网络资源加载
+    /// </summary>
+    public static async Task LoadNetworkResourcesExample(LoadingStateManager manager)
+    {
+        // 注册网络加载项
+        manager.RegisterItem(
+            "network.config",
+            LoadingItemType.Network,
+            "配置数据",
+            "从服务器获取最新配置");
+
+        manager.StartItem("network.config", "正在连接服务器...");
+
+        try
+        {
+            // 模拟网络请求
+            await Task.Delay(1000);
+
+            manager.UpdateProgress("network.config", 50, "正在下载数据...");
+
+            await Task.Delay(1000);
+
+            manager.CompleteItem("network.config", "配置数据已更新");
+        }
+        catch (Exception ex)
+        {
+            manager.FailItem("network.config", "网络请求失败", ex.Message);
+        }
+    }
+
+    /// <summary>
+    /// 示例：带超时的加载
+    /// </summary>
+    public static async Task LoadWithTimeoutExample(
+        LoadingStateManager manager,
+        LoadingTimeoutHandler timeoutHandler)
+    {
+        // 设置超时时间为 10 秒
+        timeoutHandler.SetItemTimeout("data.heavy", TimeSpan.FromSeconds(10));
+
+        // 注册加载项
+        manager.RegisterItem(
+            "data.heavy",
+            LoadingItemType.Data,
+            "大数据处理",
+            "处理大量数据，可能需要较长时间");
+
+        // 订阅超时事件
+        timeoutHandler.ItemTimeout += (s, e) =>
+        {
+            Console.WriteLine($"加载项 '{e.ItemName}' 超时！");
+        };
+
+        timeoutHandler.ItemRetry += (s, e) =>
+        {
+            Console.WriteLine($"正在重试 '{e.ItemName}' ({e.RetryCount}/{e.MaxRetryCount})...");
+        };
+
+        // 开始加载
+        manager.StartItem("data.heavy", "正在处理数据...");
+
+        // 模拟长时间操作
+        await Task.Delay(15000);
+
+        // 完成
+        manager.CompleteItem("data.heavy", "数据处理完成");
+    }
+
+    /// <summary>
+    /// 示例：完整启动流程
+    /// </summary>
+    public static async Task FullStartupExample(
+        LoadingStateManager manager,
+        LoadingStateReporter reporter,
+        LoadingTimeoutHandler timeoutHandler)
+    {
+        // 启动超时处理器
+        timeoutHandler.Start();
+
+        // 设置阶段
+        manager.SetStage(StartupStage.Initializing, "开始初始化...");
+
+        // 1. 系统初始化
+        manager.RegisterItem("system.init", LoadingItemType.System, "系统初始化");
+        manager.StartItem("system.init");
+        await Task.Delay(500);
+        manager.CompleteItem("system.init");
+
+        // 2. 加载设置
+        manager.SetStage(StartupStage.LoadingSettings, "正在加载设置...");
+        manager.RegisterItem("settings.load", LoadingItemType.Settings, "用户设置");
+        manager.StartItem("settings.load");
+        await Task.Delay(800);
+        manager.CompleteItem("settings.load");
+
+        // 3. 加载插件
+        manager.SetStage(StartupStage.LoadingPlugins, "正在加载插件...");
+        await LoadPluginsExample(manager);
+
+        // 4. 加载组件
+        await LoadComponentsExample(manager);
+
+        // 5. 加载网络资源
+        await LoadNetworkResourcesExample(manager);
+
+        // 6. 初始化界面
+        manager.SetStage(StartupStage.InitializingUI, "正在初始化界面...");
+        manager.RegisterItem("ui.init", LoadingItemType.System, "界面初始化");
+        manager.StartItem("ui.init");
+        await Task.Delay(600);
+        manager.CompleteItem("ui.init");
+
+        // 完成
+        manager.SetStage(StartupStage.Ready, "加载完成");
+
+        // 停止超时处理器
+        timeoutHandler.Stop();
+    }
+}

LanMountainDesktop/Services/Loading/LoadingTimeoutHandler.cs

@@ -0,0 +1,275 @@
+using System.Timers;
+using LanMountainDesktop.Shared.Contracts.Launcher;
+
+namespace LanMountainDesktop.Services.Loading;
+
+/// <summary>
+/// 加载超时处理器 - 监控加载项超时并执行相应处理
+/// </summary>
+public class LoadingTimeoutHandler : IDisposable
+{
+    private readonly LoadingStateManager _manager;
+    private readonly System.Timers.Timer _checkTimer;
+    private readonly Dictionary<string, TimeSpan> _itemTimeouts = new();
+    private readonly Dictionary<string, int> _retryCounts = new();
+    private readonly object _lock = new();
+    private bool _isDisposed;
+
+    /// <summary>
+    /// 默认超时时间
+    /// </summary>
+    public TimeSpan DefaultTimeout { get; set; } = TimeSpan.FromSeconds(30);
+
+    /// <summary>
+    /// 最大重试次数
+    /// </summary>
+    public int MaxRetryCount { get; set; } = 3;
+
+    /// <summary>
+    /// 检查间隔
+    /// </summary>
+    public TimeSpan CheckInterval { get; set; } = TimeSpan.FromSeconds(5);
+
+    /// <summary>
+    /// 超时事件
+    /// </summary>
+    public event EventHandler<LoadingTimeoutEventArgs>? ItemTimeout;
+
+    /// <summary>
+    /// 重试事件
+    /// </summary>
+    public event EventHandler<LoadingRetryEventArgs>? ItemRetry;
+
+    /// <summary>
+    /// 最终失败事件（超过最大重试次数）
+    /// </summary>
+    public event EventHandler<LoadingTimeoutEventArgs>? ItemFailed;
+
+    public LoadingTimeoutHandler(LoadingStateManager manager)
+    {
+        _manager = manager ?? throw new ArgumentNullException(nameof(manager));
+
+        _checkTimer = new System.Timers.Timer(CheckInterval.TotalMilliseconds);
+        _checkTimer.Elapsed += OnCheckTimerElapsed;
+        _checkTimer.AutoReset = true;
+
+        // 订阅状态变更事件
+        _manager.StateChanged += OnStateChanged;
+    }
+
+    /// <summary>
+    /// 启动监控
+    /// </summary>
+    public void Start()
+    {
+        if (_isDisposed) return;
+        _checkTimer.Start();
+        AppLogger.Info("LoadingTimeoutHandler", "Timeout handler started");
+    }
+
+    /// <summary>
+    /// 停止监控
+    /// </summary>
+    public void Stop()
+    {
+        _checkTimer.Stop();
+        AppLogger.Info("LoadingTimeoutHandler", "Timeout handler stopped");
+    }
+
+    /// <summary>
+    /// 为特定加载项设置超时
+    /// </summary>
+    public void SetItemTimeout(string itemId, TimeSpan timeout)
+    {
+        lock (_lock)
+        {
+            _itemTimeouts[itemId] = timeout;
+        }
+    }
+
+    /// <summary>
+    /// 获取加载项的超时时间
+    /// </summary>
+    public TimeSpan GetItemTimeout(string itemId)
+    {
+        lock (_lock)
+        {
+            return _itemTimeouts.TryGetValue(itemId, out var timeout) ? timeout : DefaultTimeout;
+        }
+    }
+
+    /// <summary>
+    /// 重置重试计数
+    /// </summary>
+    public void ResetRetryCount(string itemId)
+    {
+        lock (_lock)
+        {
+            _retryCounts[itemId] = 0;
+        }
+    }
+
+    /// <summary>
+    /// 定时检查超时
+    /// </summary>
+    private void OnCheckTimerElapsed(object? sender, ElapsedEventArgs e)
+    {
+        if (_isDisposed) return;
+
+        try
+        {
+            var activeItems = _manager.GetActiveItems().ToList();
+            var now = DateTimeOffset.UtcNow;
+
+            foreach (var item in activeItems)
+            {
+                if (!item.StartTime.HasValue) continue;
+
+                var timeout = GetItemTimeout(item.Id);
+                var elapsed = now - item.StartTime.Value;
+
+                if (elapsed > timeout)
+                {
+                    HandleTimeout(item.Id, elapsed);
+                }
+            }
+        }
+        catch (Exception ex)
+        {
+            AppLogger.Warn("LoadingTimeoutHandler", $"Error checking timeouts: {ex.Message}");
+        }
+    }
+
+    /// <summary>
+    /// 处理超时
+    /// </summary>
+    private void HandleTimeout(string itemId, TimeSpan elapsed)
+    {
+        lock (_lock)
+        {
+            var retryCount = _retryCounts.GetValueOrDefault(itemId, 0);
+
+            if (retryCount < MaxRetryCount)
+            {
+                // 重试
+                _retryCounts[itemId] = retryCount + 1;
+
+                var item = _manager.GetAllItems().FirstOrDefault(i => i.Id == itemId);
+                if (item != null)
+                {
+                    AppLogger.Warn("LoadingTimeoutHandler",
+                        $"Item '{item.Name}' timed out after {elapsed.TotalSeconds}s, retrying ({retryCount + 1}/{MaxRetryCount})...");
+
+                    ItemRetry?.Invoke(this, new LoadingRetryEventArgs
+                    {
+                        ItemId = itemId,
+                        ItemName = item.Name,
+                        RetryCount = retryCount + 1,
+                        MaxRetryCount = MaxRetryCount,
+                        ElapsedTime = elapsed
+                    });
+
+                    // 重新启动该项
+                    _manager.StartItem(itemId, $"第 {retryCount + 1} 次重试...");
+                }
+            }
+            else
+            {
+                // 最终失败
+                _retryCounts.Remove(itemId);
+
+                var item = _manager.GetAllItems().FirstOrDefault(i => i.Id == itemId);
+                if (item != null)
+                {
+                    AppLogger.Error("LoadingTimeoutHandler",
+                        $"Item '{item.Name}' failed after {MaxRetryCount} retries ({elapsed.TotalSeconds}s)");
+
+                    var args = new LoadingTimeoutEventArgs
+                    {
+                        ItemId = itemId,
+                        ItemName = item.Name,
+                        ElapsedTime = elapsed,
+                        RetryCount = MaxRetryCount,
+                        IsFinalFailure = true
+                    };
+
+                    ItemTimeout?.Invoke(this, args);
+                    ItemFailed?.Invoke(this, args);
+
+                    // 标记为失败
+                    _manager.FailItem(itemId,
+                        $"加载超时（超过 {elapsed.TotalSeconds:F0} 秒）",
+                        $"已重试 {MaxRetryCount} 次但仍失败");
+                }
+            }
+        }
+    }
+
+    /// <summary>
+    /// 状态变更事件处理
+    /// </summary>
+    private void OnStateChanged(object? sender, LoadingStateChangedEventArgs e)
+    {
+        // 当项完成或失败时，清除重试计数
+        if (e.CurrentState is LoadingState.Completed or LoadingState.Failed or LoadingState.Cancelled)
+        {
+            lock (_lock)
+            {
+                _retryCounts.Remove(e.Item.Id);
+            }
+        }
+
+        // 当项开始时，如果是第一次开始，初始化重试计数
+        if (e.CurrentState == LoadingState.InProgress &&
+            (e.PreviousState == null || e.PreviousState == LoadingState.Pending))
+        {
+            lock (_lock)
+            {
+                if (!_retryCounts.ContainsKey(e.Item.Id))
+                {
+                    _retryCounts[e.Item.Id] = 0;
+                }
+            }
+        }
+    }
+
+    public void Dispose()
+    {
+        if (_isDisposed) return;
+        _isDisposed = true;
+
+        Stop();
+
+        _checkTimer.Elapsed -= OnCheckTimerElapsed;
+        _checkTimer.Dispose();
+
+        _manager.StateChanged -= OnStateChanged;
+
+        _itemTimeouts.Clear();
+        _retryCounts.Clear();
+    }
+}
+
+/// <summary>
+/// 加载超时事件参数
+/// </summary>
+public class LoadingTimeoutEventArgs : EventArgs
+{
+    public required string ItemId { get; init; }
+    public required string ItemName { get; init; }
+    public required TimeSpan ElapsedTime { get; init; }
+    public int RetryCount { get; init; }
+    public bool IsFinalFailure { get; init; }
+}
+
+/// <summary>
+/// 加载重试事件参数
+/// </summary>
+public class LoadingRetryEventArgs : EventArgs
+{
+    public required string ItemId { get; init; }
+    public required string ItemName { get; init; }
+    public required int RetryCount { get; init; }
+    public required int MaxRetryCount { get; init; }
+    public required TimeSpan ElapsedTime { get; init; }
+}

LanMountainDesktop/Services/PdcReleaseUpdateService.cs

@@ -0,0 +1,464 @@
+using System;
+using System.Collections.Generic;
+using System.Globalization;
+using System.Linq;
+using System.Net.Http;
+using System.Runtime.InteropServices;
+using System.Text.Json;
+using System.Threading;
+using System.Threading.Tasks;
+
+namespace LanMountainDesktop.Services;
+
+/// <summary>
+/// Best-effort PDC client that maps PDC responses to the existing update result model.
+/// This keeps launcher update contracts stable while allowing a gradual migration.
+/// </summary>
+public sealed class PdcReleaseUpdateService : IDisposable
+{
+    private readonly HttpClient _httpClient;
+    private readonly bool _ownsHttpClient;
+
+    public PdcReleaseUpdateService(HttpClient? httpClient = null)
+    {
+        if (httpClient is null)
+        {
+            _httpClient = new HttpClient
+            {
+                Timeout = TimeSpan.FromSeconds(20)
+            };
+            _ownsHttpClient = true;
+        }
+        else
+        {
+            _httpClient = httpClient;
+            _ownsHttpClient = false;
+        }
+    }
+
+    public void Dispose()
+    {
+        if (_ownsHttpClient)
+        {
+            _httpClient.Dispose();
+        }
+    }
+
+    public Task<UpdateCheckResult> CheckForUpdatesAsync(
+        Version currentVersion,
+        bool includePrerelease,
+        CancellationToken cancellationToken = default)
+    {
+        return CheckForUpdatesCoreAsync(currentVersion, includePrerelease, isForce: false, cancellationToken);
+    }
+
+    public Task<UpdateCheckResult> ForceCheckForUpdatesAsync(
+        Version currentVersion,
+        bool includePrerelease,
+        CancellationToken cancellationToken = default)
+    {
+        return CheckForUpdatesCoreAsync(currentVersion, includePrerelease, isForce: true, cancellationToken);
+    }
+
+    private async Task<UpdateCheckResult> CheckForUpdatesCoreAsync(
+        Version currentVersion,
+        bool includePrerelease,
+        bool isForce,
+        CancellationToken cancellationToken)
+    {
+        var normalizedCurrentVersion = NormalizeVersion(currentVersion);
+        var normalizedCurrentVersionText = FormatVersionText(normalizedCurrentVersion);
+        var endpoint = ResolveEndpoint();
+
+        if (string.IsNullOrWhiteSpace(endpoint))
+        {
+            return new UpdateCheckResult(
+                Success: false,
+                IsUpdateAvailable: false,
+                CurrentVersionText: normalizedCurrentVersionText,
+                LatestVersionText: "-",
+                Release: null,
+                PreferredAsset: null,
+                ErrorMessage: "PDC endpoint is not configured.",
+                ForceMode: isForce);
+        }
+
+        try
+        {
+            var metadataUrl = BuildUri(endpoint, "api/v1/public/distributions/metadata");
+            var metadata = await GetContentNodeAsync(metadataUrl, cancellationToken).ConfigureAwait(false);
+
+            var channelId = ResolveChannelId(metadata, includePrerelease);
+            if (string.IsNullOrWhiteSpace(channelId))
+            {
+                channelId = includePrerelease ? "preview" : "stable";
+            }
+
+            var latestUrl = BuildUri(
+                endpoint,
+                $"api/v1/public/distributions/latest/{Uri.EscapeDataString(channelId)}?appVersion={Uri.EscapeDataString(normalizedCurrentVersionText)}");
+            var latestNode = await GetContentNodeAsync(latestUrl, cancellationToken).ConfigureAwait(false);
+
+            var latestVersionText = ReadString(latestNode, "version") ?? "-";
+            if (!TryParseVersion(latestVersionText, out var latestVersion) || latestVersion is null)
+            {
+                return new UpdateCheckResult(
+                    Success: false,
+                    IsUpdateAvailable: false,
+                    CurrentVersionText: normalizedCurrentVersionText,
+                    LatestVersionText: latestVersionText,
+                    Release: null,
+                    PreferredAsset: null,
+                    ErrorMessage: "PDC latest distribution version is invalid.",
+                    ForceMode: isForce);
+            }
+
+            var distributionId = ReadString(latestNode, "distributionId");
+            if (string.IsNullOrWhiteSpace(distributionId))
+            {
+                return new UpdateCheckResult(
+                    Success: false,
+                    IsUpdateAvailable: false,
+                    CurrentVersionText: normalizedCurrentVersionText,
+                    LatestVersionText: latestVersionText,
+                    Release: null,
+                    PreferredAsset: null,
+                    ErrorMessage: "PDC latest distribution id is missing.",
+                    ForceMode: isForce);
+            }
+
+            var hasUpdate = latestVersion > normalizedCurrentVersion;
+            if (!isForce && !hasUpdate)
+            {
+                return new UpdateCheckResult(
+                    Success: true,
+                    IsUpdateAvailable: false,
+                    CurrentVersionText: normalizedCurrentVersionText,
+                    LatestVersionText: latestVersionText,
+                    Release: null,
+                    PreferredAsset: null,
+                    ErrorMessage: null,
+                    ForceMode: false);
+            }
+
+            var subChannel = ResolveSubChannel();
+            var distributionUrl = BuildUri(
+                endpoint,
+                $"api/v1/public/distributions/{Uri.EscapeDataString(distributionId)}/{Uri.EscapeDataString(subChannel)}");
+            var distributionNode = await GetContentNodeAsync(distributionUrl, cancellationToken).ConfigureAwait(false);
+
+            var assets = ResolveAssets(distributionNode);
+            if (assets.Count == 0)
+            {
+                return new UpdateCheckResult(
+                    Success: false,
+                    IsUpdateAvailable: false,
+                    CurrentVersionText: normalizedCurrentVersionText,
+                    LatestVersionText: latestVersionText,
+                    Release: null,
+                    PreferredAsset: null,
+                    ErrorMessage: "PDC distribution response does not expose downloadable update assets.",
+                    ForceMode: isForce);
+            }
+
+            var release = new GitHubReleaseInfo(
+                TagName: $"v{latestVersionText}",
+                Name: $"PDC Distribution {latestVersionText}",
+                IsPrerelease: includePrerelease,
+                IsDraft: false,
+                PublishedAt: DateTimeOffset.UtcNow,
+                Assets: assets);
+
+            return new UpdateCheckResult(
+                Success: true,
+                IsUpdateAvailable: true,
+                CurrentVersionText: normalizedCurrentVersionText,
+                LatestVersionText: latestVersionText,
+                Release: release,
+                PreferredAsset: null,
+                ErrorMessage: null,
+                ForceMode: isForce);
+        }
+        catch (OperationCanceledException)
+        {
+            throw;
+        }
+        catch (Exception ex)
+        {
+            return new UpdateCheckResult(
+                Success: false,
+                IsUpdateAvailable: false,
+                CurrentVersionText: normalizedCurrentVersionText,
+                LatestVersionText: "-",
+                Release: null,
+                PreferredAsset: null,
+                ErrorMessage: $"PDC request failed: {ex.Message}",
+                ForceMode: isForce);
+        }
+    }
+
+    private async Task<JsonElement> GetContentNodeAsync(string url, CancellationToken cancellationToken)
+    {
+        using var request = new HttpRequestMessage(HttpMethod.Get, url);
+        var token = ResolveToken();
+        if (!string.IsNullOrWhiteSpace(token))
+        {
+            request.Headers.Authorization = new System.Net.Http.Headers.AuthenticationHeaderValue("Bearer", token);
+        }
+
+        using var response = await _httpClient.SendAsync(request, cancellationToken).ConfigureAwait(false);
+        var body = await response.Content.ReadAsStringAsync(cancellationToken).ConfigureAwait(false);
+        if (!response.IsSuccessStatusCode)
+        {
+            throw new InvalidOperationException($"HTTP {(int)response.StatusCode}: {Truncate(body, 180)}");
+        }
+
+        using var document = JsonDocument.Parse(body);
+        var root = document.RootElement;
+        if (root.ValueKind == JsonValueKind.Object &&
+            root.TryGetProperty("content", out var content))
+        {
+            return content.Clone();
+        }
+
+        return root.Clone();
+    }
+
+    private static IReadOnlyList<GitHubReleaseAsset> ResolveAssets(JsonElement distributionNode)
+    {
+        var assets = new List<GitHubReleaseAsset>();
+        if (distributionNode.ValueKind != JsonValueKind.Object)
+        {
+            return assets;
+        }
+
+        if (distributionNode.TryGetProperty("assets", out var assetsNode) &&
+            assetsNode.ValueKind == JsonValueKind.Array)
+        {
+            foreach (var assetNode in assetsNode.EnumerateArray())
+            {
+                if (assetNode.ValueKind != JsonValueKind.Object)
+                {
+                    continue;
+                }
+
+                var name = ReadString(assetNode, "name");
+                var url = ReadString(assetNode, "url") ??
+                          ReadString(assetNode, "downloadUrl") ??
+                          ReadString(assetNode, "browserDownloadUrl");
+                if (string.IsNullOrWhiteSpace(name) || string.IsNullOrWhiteSpace(url))
+                {
+                    continue;
+                }
+
+                var size = ReadInt64(assetNode, "size") ?? 0L;
+                var sha256 = ReadString(assetNode, "sha256");
+                assets.Add(new GitHubReleaseAsset(name, url, size, sha256));
+            }
+        }
+
+        if (assets.Count > 0)
+        {
+            return assets;
+        }
+
+        // Field-level fallback for service-side URL projection.
+        var manifestUrl = ReadString(distributionNode, "manifestUrl")
+                          ?? ReadString(distributionNode, "fileMapUrl");
+        var signatureUrl = ReadString(distributionNode, "signatureUrl")
+                           ?? ReadString(distributionNode, "fileMapSignatureUrl");
+        var archiveUrl = ReadString(distributionNode, "archiveUrl")
+                         ?? ReadString(distributionNode, "updateArchiveUrl")
+                         ?? ReadString(distributionNode, "payloadUrl");
+
+        if (!string.IsNullOrWhiteSpace(manifestUrl))
+        {
+            assets.Add(new GitHubReleaseAsset("files.json", manifestUrl, 0, null));
+        }
+
+        if (!string.IsNullOrWhiteSpace(signatureUrl))
+        {
+            assets.Add(new GitHubReleaseAsset("files.json.sig", signatureUrl, 0, null));
+        }
+
+        if (!string.IsNullOrWhiteSpace(archiveUrl))
+        {
+            assets.Add(new GitHubReleaseAsset("update.zip", archiveUrl, 0, null));
+        }
+
+        return assets;
+    }
+
+    private static string ResolveChannelId(JsonElement metadataNode, bool includePrerelease)
+    {
+        if (metadataNode.ValueKind != JsonValueKind.Object ||
+            !metadataNode.TryGetProperty("channels", out var channelsNode))
+        {
+            return includePrerelease ? "preview" : "stable";
+        }
+
+        var defaultChannelId = ReadString(metadataNode, "defaultChannelId") ?? string.Empty;
+        if (channelsNode.ValueKind != JsonValueKind.Object)
+        {
+            return defaultChannelId;
+        }
+
+        string? matchedPreview = null;
+        string? matchedStable = null;
+
+        foreach (var channel in channelsNode.EnumerateObject())
+        {
+            var name = ReadString(channel.Value, "name") ?? channel.Name;
+            if (string.IsNullOrWhiteSpace(matchedPreview) &&
+                (name.Contains("preview", StringComparison.OrdinalIgnoreCase) ||
+                 name.Contains("beta", StringComparison.OrdinalIgnoreCase) ||
+                 name.Contains("dev", StringComparison.OrdinalIgnoreCase)))
+            {
+                matchedPreview = channel.Name;
+            }
+
+            if (string.IsNullOrWhiteSpace(matchedStable) &&
+                (name.Contains("stable", StringComparison.OrdinalIgnoreCase) ||
+                 name.Contains("release", StringComparison.OrdinalIgnoreCase)))
+            {
+                matchedStable = channel.Name;
+            }
+        }
+
+        if (includePrerelease)
+        {
+            return matchedPreview ?? defaultChannelId ?? "preview";
+        }
+
+        return matchedStable ?? defaultChannelId ?? "stable";
+    }
+
+    private static string ResolveSubChannel()
+    {
+        var configured = Environment.GetEnvironmentVariable("LANMOUNTAIN_PDC_SUBCHANNEL")
+                         ?? Environment.GetEnvironmentVariable("PDC_SUBCHANNEL");
+        if (!string.IsNullOrWhiteSpace(configured))
+        {
+            return configured.Trim();
+        }
+
+        var os = OperatingSystem.IsWindows()
+            ? "windows"
+            : OperatingSystem.IsLinux()
+                ? "linux"
+                : OperatingSystem.IsMacOS()
+                    ? "macos"
+                    : "unknown";
+
+        var arch = RuntimeInformation.OSArchitecture switch
+        {
+            Architecture.X86 => "x86",
+            Architecture.Arm => "arm",
+            Architecture.Arm64 => "arm64",
+            _ => "x64"
+        };
+
+        return $"{os}_{arch}_release_folderClassic";
+    }
+
+    private static string? ResolveEndpoint()
+    {
+        var endpoint = Environment.GetEnvironmentVariable("LANMOUNTAIN_PDC_ENDPOINT")
+                      ?? Environment.GetEnvironmentVariable("PDC_ENDPOINT");
+        return string.IsNullOrWhiteSpace(endpoint) ? null : endpoint.Trim().TrimEnd('/');
+    }
+
+    private static string? ResolveToken()
+    {
+        var token = Environment.GetEnvironmentVariable("LANMOUNTAIN_PDC_TOKEN")
+                    ?? Environment.GetEnvironmentVariable("PDC_TOKEN");
+        return string.IsNullOrWhiteSpace(token) ? null : token.Trim();
+    }
+
+    private static string BuildUri(string endpoint, string relativePath)
+    {
+        return $"{endpoint.TrimEnd('/')}/{relativePath.TrimStart('/')}";
+    }
+
+    private static string? ReadString(JsonElement node, string propertyName)
+    {
+        if (node.ValueKind != JsonValueKind.Object || !node.TryGetProperty(propertyName, out var value))
+        {
+            return null;
+        }
+
+        return value.ValueKind == JsonValueKind.String
+            ? value.GetString()
+            : value.ToString();
+    }
+
+    private static long? ReadInt64(JsonElement node, string propertyName)
+    {
+        if (node.ValueKind != JsonValueKind.Object || !node.TryGetProperty(propertyName, out var value))
+        {
+            return null;
+        }
+
+        if (value.TryGetInt64(out var number))
+        {
+            return number;
+        }
+
+        var text = value.ToString();
+        return long.TryParse(text, NumberStyles.Integer, CultureInfo.InvariantCulture, out var parsed)
+            ? parsed
+            : null;
+    }
+
+    private static bool TryParseVersion(string? value, out Version? version)
+    {
+        version = null;
+        if (string.IsNullOrWhiteSpace(value))
+        {
+            return false;
+        }
+
+        var normalized = value.Trim().TrimStart('v', 'V');
+        var separatorIndex = normalized.IndexOfAny(['-', '+', ' ']);
+        if (separatorIndex > 0)
+        {
+            normalized = normalized[..separatorIndex];
+        }
+
+        if (!Version.TryParse(normalized, out var parsed))
+        {
+            return false;
+        }
+
+        version = NormalizeVersion(parsed);
+        return true;
+    }
+
+    private static Version NormalizeVersion(Version version)
+    {
+        var major = Math.Max(0, version.Major);
+        var minor = Math.Max(0, version.Minor);
+        var build = Math.Max(0, version.Build >= 0 ? version.Build : 0);
+        var revision = Math.Max(0, version.Revision >= 0 ? version.Revision : 0);
+        return revision > 0
+            ? new Version(major, minor, build, revision)
+            : new Version(major, minor, build);
+    }
+
+    private static string FormatVersionText(Version version)
+    {
+        return version.Revision > 0
+            ? version.ToString(4)
+            : version.ToString(3);
+    }
+
+    private static string Truncate(string value, int maxLength)
+    {
+        if (string.IsNullOrEmpty(value) || value.Length <= maxLength)
+        {
+            return value;
+        }
+
+        return value[..maxLength];
+    }
+}

LanMountainDesktop/Services/PostHogUsageTelemetryService.cs

@@ -1,29 +1,23 @@
 using System;
 using System.Collections.Generic;
 using System.Linq;
-using System.Net.Http;
-using System.Text;
-using System.Text.Json;
 using System.Threading;
 using LanMountainDesktop.Models;
 using LanMountainDesktop.PluginSdk;
 using LanMountainDesktop.Services.Settings;
+using PostHog;
 
 namespace LanMountainDesktop.Services;
 
 public sealed class PostHogUsageTelemetryService : IDisposable
 {
     private const string PostHogApiKey = "phc_bhQZvKDDfsEdLT6kkRFvrWMT8Pc5aCGGsnxoc5ijSf9";
-    private const string PostHogHost = "https://us.i.posthog.com/capture/";
+    private const string PostHogHostUrl = "https://us.i.posthog.com";
 
     private readonly ISettingsFacadeService _settingsFacade;
     private readonly ISettingsService _settingsService;
-    private readonly HttpClient _httpClient = new()
-    {
-        Timeout = TimeSpan.FromSeconds(10)
-    };
-    private readonly Queue<TelemetryEvent> _eventQueue = new();
-    private readonly object _queueLock = new();
+    private readonly PostHogClient _client;
+    private readonly CancellationTokenSource _cts = new();
 
     private Timer? _flushTimer;
     private bool _isInitialized;
@@ -39,6 +33,14 @@ public sealed class PostHogUsageTelemetryService : IDisposable
         _settingsFacade = settingsFacade ?? throw new ArgumentNullException(nameof(settingsFacade));
         _settingsService = settingsFacade.Settings;
         _settingsService.Changed += OnSettingsChanged;
+
+        _client = new PostHogClient(new PostHogOptions
+        {
+            ProjectApiKey = PostHogApiKey,
+            HostUrl = new Uri(PostHogHostUrl),
+            FlushAt = 20,
+            FlushInterval = TimeSpan.FromSeconds(30)
+        });
     }
 
     public bool IsUsageEnabled => _isUsageEnabled;
@@ -56,7 +58,7 @@ public sealed class PostHogUsageTelemetryService : IDisposable
         RefreshEnabledState(forceSessionStart: true);
 
         _flushTimer = new Timer(
-            _ => FlushEvents(),
+            _ => _ = _client.FlushAsync(),
             null,
             TimeSpan.FromSeconds(10),
             TimeSpan.FromSeconds(30));
@@ -88,14 +90,12 @@ public sealed class PostHogUsageTelemetryService : IDisposable
                 return;
             }
 
-            ClearQueuedEvents();
             StopSessionWithoutSending();
         }
         catch (Exception ex)
         {
             AppLogger.Warn("PostHogUsage", "Failed to refresh usage analytics enabled state.", ex);
             _isUsageEnabled = false;
-            ClearQueuedEvents();
             StopSessionWithoutSending();
         }
     }
@@ -278,7 +278,7 @@ public sealed class PostHogUsageTelemetryService : IDisposable
             EndSession(source, isRestart);
         }
 
-        FlushEvents();
+        _ = _client.FlushAsync();
         AppLogger.Info(
             "PostHogUsage",
             $"Usage telemetry shutdown complete. Source='{source}'; Restart='{isRestart}'; Enabled={_isUsageEnabled}.");
@@ -291,16 +291,13 @@ public sealed class PostHogUsageTelemetryService : IDisposable
             _flushTimer?.Dispose();
             _settingsService.Changed -= OnSettingsChanged;
             Shutdown(isRestart: false, source: "Dispose");
-            FlushEvents();
+            _cts.Cancel();
+            _client.Dispose();
         }
         catch (Exception ex)
         {
             AppLogger.Warn("PostHogUsage", "Error disposing usage telemetry service.", ex);
         }
-        finally
-        {
-            _httpClient.Dispose();
-        }
     }
 
     private void EnsureBaselineEventSent()
@@ -313,66 +310,35 @@ public sealed class PostHogUsageTelemetryService : IDisposable
                 return;
             }
 
-            var now = DateTimeOffset.UtcNow;
-            if (SendBaselineEventToPostHog(identity.InstallId, now))
+            var distinctId = identity.InstallId;
+            var personProps = new Dictionary<string, object?>
             {
-                identity.MarkBaselineReported();
-            }
-        }
-        catch (Exception ex)
-        {
-            AppLogger.Warn("PostHogUsage", "Failed to send baseline launch event.", ex);
-        }
-    }
-
-    private bool SendBaselineEventToPostHog(string installId, DateTimeOffset timestamp)
-    {
-        try
-        {
-            var requestBody = new Dictionary<string, object?>
-            {
-                ["api_key"] = PostHogApiKey,
-                ["event"] = "app_first_launch",
-                ["distinct_id"] = installId,
-                ["timestamp"] = timestamp.ToString("o"),
-                ["properties"] = new Dictionary<string, object?>
-                {
-                    ["install_id"] = installId,
-                    ["app_version"] = TelemetryEnvironmentInfo.GetAppVersion(),
-                    ["os_name"] = TelemetryEnvironmentInfo.GetOsName(),
-                    ["os_version"] = TelemetryEnvironmentInfo.GetOsVersion(),
-                    ["device_model"] = TelemetryEnvironmentInfo.GetDeviceModel(),
-                    ["device_arch"] = TelemetryEnvironmentInfo.GetDeviceArchitecture(),
-                    ["runtime_version"] = TelemetryEnvironmentInfo.GetRuntimeVersion(),
-                    ["language"] = TelemetryEnvironmentInfo.GetSystemLanguage(),
-                    ["launch_time_utc"] = timestamp.ToString("o")
-                }
+                ["install_id"] = identity.InstallId,
+                ["app_version"] = TelemetryEnvironmentInfo.GetAppVersion(),
+                ["os_name"] = TelemetryEnvironmentInfo.GetOsName(),
+                ["os_version"] = TelemetryEnvironmentInfo.GetOsVersion(),
+                ["device_model"] = TelemetryEnvironmentInfo.GetDeviceModel(),
+                ["device_arch"] = TelemetryEnvironmentInfo.GetDeviceArchitecture(),
+                ["runtime_version"] = TelemetryEnvironmentInfo.GetRuntimeVersion(),
+                ["language"] = TelemetryEnvironmentInfo.GetSystemLanguage()
             };
 
-            var json = JsonSerializer.Serialize(requestBody);
-            var bytes = Encoding.UTF8.GetBytes(json);
+            _ = _client.IdentifyAsync(distinctId, personProps, null, _cts.Token);
 
-            using var content = new ByteArrayContent(bytes);
-            content.Headers.ContentType = new System.Net.Http.Headers.MediaTypeHeaderValue("application/json");
+            _client.Capture(
+                distinctId,
+                "app_first_launch",
+                personProps,
+                groups: null,
+                sendFeatureFlags: false);
 
-            var response = _httpClient.PostAsync(PostHogHost, content).GetAwaiter().GetResult();
-            var responseBody = response.Content.ReadAsStringAsync().GetAwaiter().GetResult();
-
-            if (!response.IsSuccessStatusCode)
-            {
-                AppLogger.Warn(
-                    "PostHogUsage",
-                    $"PostHog baseline event failed: {response.StatusCode} - {responseBody}");
-                return false;
-            }
-
-            AppLogger.Info("PostHogUsage", "Sent first-launch baseline event.");
-            return true;
+            _ = _client.FlushAsync();
+            identity.MarkBaselineReported();
+            AppLogger.Info("PostHogUsage", "Sent first-launch baseline event via SDK.");
         }
         catch (Exception ex)
         {
             AppLogger.Warn("PostHogUsage", "Failed to send baseline launch event.", ex);
-            return false;
         }
     }
 
@@ -479,137 +445,60 @@ public sealed class PostHogUsageTelemetryService : IDisposable
             return;
         }
 
-        var eventData = new TelemetryEvent(
-            eventName,
-            TelemetryIdentityService.Instance.TelemetryId,
-            TelemetryIdentityService.Instance.InstallId,
-            TelemetryIdentityService.Instance.TelemetryId,
-            _sessionId,
-            Interlocked.Increment(ref _sequence),
-            DateTimeOffset.UtcNow,
-            payload ?? new Dictionary<string, object?>(),
-            stateBefore,
-            stateAfter);
+        var identity = TelemetryIdentityService.Instance;
+        var distinctId = identity.TelemetryId;
+        var seq = Interlocked.Increment(ref _sequence);
 
-        lock (_queueLock)
+        var properties = new Dictionary<string, object?>(StringComparer.OrdinalIgnoreCase)
         {
-            _eventQueue.Enqueue(eventData);
+            ["install_id"] = identity.InstallId,
+            ["telemetry_id"] = identity.TelemetryId,
+            ["session_id"] = _sessionId,
+            ["sequence"] = seq,
+            ["timestamp_utc"] = DateTimeOffset.UtcNow.ToString("o"),
+            ["app_version"] = TelemetryEnvironmentInfo.GetAppVersion(),
+            ["os_name"] = TelemetryEnvironmentInfo.GetOsName(),
+            ["os_version"] = TelemetryEnvironmentInfo.GetOsVersion(),
+            ["device_model"] = TelemetryEnvironmentInfo.GetDeviceModel(),
+            ["device_arch"] = TelemetryEnvironmentInfo.GetDeviceArchitecture(),
+            ["runtime_version"] = TelemetryEnvironmentInfo.GetRuntimeVersion(),
+            ["language"] = TelemetryEnvironmentInfo.GetSystemLanguage()
+        };
+
+        if (payload is not null)
+        {
+            foreach (var kvp in payload)
+            {
+                properties[$"payload_{kvp.Key}"] = kvp.Value;
+            }
         }
 
+        if (stateBefore is not null && stateBefore.Count > 0)
+        {
+            foreach (var kvp in stateBefore)
+            {
+                properties[$"state_before_{kvp.Key}"] = kvp.Value;
+            }
+        }
+
+        if (stateAfter is not null && stateAfter.Count > 0)
+        {
+            foreach (var kvp in stateAfter)
+            {
+                properties[$"state_after_{kvp.Key}"] = kvp.Value;
+            }
+        }
+
+        _client.Capture(
+            distinctId,
+            eventName,
+            properties,
+            groups: null,
+            sendFeatureFlags: false);
+
         if (forceFlush)
         {
-            FlushEvents();
-            return;
-        }
-
-        var shouldFlush = false;
-        lock (_queueLock)
-        {
-            shouldFlush = _eventQueue.Count >= 20;
-        }
-
-        if (shouldFlush)
-        {
-            FlushEvents();
-        }
-    }
-
-    private void FlushEvents()
-    {
-        List<TelemetryEvent> eventsToSend;
-
-        lock (_queueLock)
-        {
-            if (_eventQueue.Count == 0)
-            {
-                return;
-            }
-
-            eventsToSend = new List<TelemetryEvent>();
-            while (_eventQueue.Count > 0 && eventsToSend.Count < 20)
-            {
-                eventsToSend.Add(_eventQueue.Dequeue());
-            }
-        }
-
-        try
-        {
-            foreach (var telemetryEvent in eventsToSend)
-            {
-                if (!SendEventToPostHog(telemetryEvent, flushImmediately: false))
-                {
-                    throw new InvalidOperationException($"Failed to send PostHog event '{telemetryEvent.EventName}'.");
-                }
-            }
-        }
-        catch (Exception ex)
-        {
-            AppLogger.Warn("PostHogUsage", "Failed to send queued events to PostHog.", ex);
-
-            lock (_queueLock)
-            {
-                foreach (var evt in eventsToSend)
-                {
-                    if (_eventQueue.Count >= 100)
-                    {
-                        break;
-                    }
-
-                    _eventQueue.Enqueue(evt);
-                }
-            }
-        }
-    }
-
-    private bool SendEventToPostHog(TelemetryEvent telemetryEvent, bool flushImmediately)
-    {
-        try
-        {
-            var requestBody = new Dictionary<string, object?>
-            {
-                ["api_key"] = PostHogApiKey,
-                ["event"] = telemetryEvent.EventName,
-                ["distinct_id"] = telemetryEvent.DistinctId,
-                ["timestamp"] = telemetryEvent.Timestamp.ToString("o"),
-                ["properties"] = telemetryEvent.ToPostHogProperties()
-            };
-
-            var json = JsonSerializer.Serialize(requestBody);
-            var bytes = Encoding.UTF8.GetBytes(json);
-
-            using var content = new ByteArrayContent(bytes);
-            content.Headers.ContentType = new System.Net.Http.Headers.MediaTypeHeaderValue("application/json");
-
-            var response = _httpClient.PostAsync(PostHogHost, content).GetAwaiter().GetResult();
-            var responseBody = response.Content.ReadAsStringAsync().GetAwaiter().GetResult();
-
-            if (!response.IsSuccessStatusCode)
-            {
-                AppLogger.Warn(
-                    "PostHogUsage",
-                    $"PostHog event '{telemetryEvent.EventName}' failed: {response.StatusCode} - {responseBody}");
-                return false;
-            }
-
-            if (flushImmediately)
-            {
-                AppLogger.Info("PostHogUsage", $"Sent event '{telemetryEvent.EventName}' immediately.");
-            }
-
-            return true;
-        }
-        catch (Exception ex)
-        {
-            AppLogger.Warn("PostHogUsage", $"Failed to send PostHog event '{telemetryEvent.EventName}'.", ex);
-            return false;
-        }
-    }
-
-    private void ClearQueuedEvents()
-    {
-        lock (_queueLock)
-        {
-            _eventQueue.Clear();
+            _ = _client.FlushAsync();
         }
     }
 

LanMountainDesktop/Services/Settings/SettingsDomainServices.cs

@@ -751,7 +751,8 @@ internal sealed class PrivacySettingsService : IPrivacySettingsService
 internal sealed class UpdateSettingsService : IUpdateSettingsService, IDisposable
 {
     private readonly ISettingsService _settingsService;
-    private readonly GitHubReleaseUpdateService _releaseUpdateService = new("wwiinnddyy", "LanMountainDesktop");
+    private readonly GitHubReleaseUpdateService _githubReleaseUpdateService = new("wwiinnddyy", "LanMountainDesktop");
+    private readonly PdcReleaseUpdateService _pdcReleaseUpdateService = new();
 
     public UpdateSettingsService(ISettingsService settingsService)
     {
@@ -830,7 +831,7 @@ internal sealed class UpdateSettingsService : IUpdateSettingsService, IDisposabl
         bool includePrerelease,
         CancellationToken cancellationToken = default)
     {
-        return _releaseUpdateService.CheckForUpdatesAsync(currentVersion, includePrerelease, cancellationToken);
+        return CheckForUpdatesCoreAsync(currentVersion, includePrerelease, isForce: false, cancellationToken);
     }
 
     public Task<UpdateCheckResult> ForceCheckForUpdatesAsync(
@@ -838,7 +839,7 @@ internal sealed class UpdateSettingsService : IUpdateSettingsService, IDisposabl
         bool includePrerelease,
         CancellationToken cancellationToken = default)
     {
-        return _releaseUpdateService.ForceCheckForUpdatesAsync(currentVersion, includePrerelease, cancellationToken);
+        return CheckForUpdatesCoreAsync(currentVersion, includePrerelease, isForce: true, cancellationToken);
     }
 
     public Task<UpdateDownloadResult> DownloadAssetAsync(
@@ -849,7 +850,7 @@ internal sealed class UpdateSettingsService : IUpdateSettingsService, IDisposabl
         IProgress<double>? progress = null,
         CancellationToken cancellationToken = default)
     {
-        return _releaseUpdateService.DownloadAssetAsync(
+        return _githubReleaseUpdateService.DownloadAssetAsync(
             asset,
             destinationFilePath,
             downloadSource,
@@ -866,7 +867,7 @@ internal sealed class UpdateSettingsService : IUpdateSettingsService, IDisposabl
         IProgress<double>? progress = null,
         CancellationToken cancellationToken = default)
     {
-        return _releaseUpdateService.RedownloadAssetAsync(
+        return _githubReleaseUpdateService.RedownloadAssetAsync(
             asset,
             destinationFilePath,
             downloadSource,
@@ -877,7 +878,36 @@ internal sealed class UpdateSettingsService : IUpdateSettingsService, IDisposabl
 
     public void Dispose()
     {
-        _releaseUpdateService.Dispose();
+        _githubReleaseUpdateService.Dispose();
+        _pdcReleaseUpdateService.Dispose();
+    }
+
+    private async Task<UpdateCheckResult> CheckForUpdatesCoreAsync(
+        Version currentVersion,
+        bool includePrerelease,
+        bool isForce,
+        CancellationToken cancellationToken)
+    {
+        var source = UpdateSettingsValues.NormalizeDownloadSource(_settingsService.Load().UpdateDownloadSource);
+        if (string.Equals(source, UpdateSettingsValues.DownloadSourcePdc, StringComparison.OrdinalIgnoreCase))
+        {
+            var pdcResult = isForce
+                ? await _pdcReleaseUpdateService.ForceCheckForUpdatesAsync(currentVersion, includePrerelease, cancellationToken)
+                : await _pdcReleaseUpdateService.CheckForUpdatesAsync(currentVersion, includePrerelease, cancellationToken);
+
+            if (pdcResult.Success)
+            {
+                return pdcResult;
+            }
+
+            AppLogger.Warn(
+                "UpdateSettings",
+                $"PDC update check failed and will fallback to GitHub. Error: {pdcResult.ErrorMessage}");
+        }
+
+        return isForce
+            ? await _githubReleaseUpdateService.ForceCheckForUpdatesAsync(currentVersion, includePrerelease, cancellationToken)
+            : await _githubReleaseUpdateService.CheckForUpdatesAsync(currentVersion, includePrerelease, cancellationToken);
     }
 }
 
@@ -1225,10 +1255,18 @@ internal sealed class PluginCatalogSettingsService : IPluginCatalogSettingsServi
 
 internal sealed class ApplicationInfoService : IApplicationInfoService
 {
-    private const string Codename = "Administrate";
+    private const string DefaultCodename = "Administrate";
 
     public string GetAppVersionText()
     {
+        // 优先从环境变量读取（Launcher 传递）
+        var envVersion = Environment.GetEnvironmentVariable(LanMountainDesktop.Shared.Contracts.Launcher.LauncherIpcConstants.VersionEnvVar);
+        if (!string.IsNullOrWhiteSpace(envVersion))
+        {
+            return envVersion;
+        }
+
+        // 回退：从程序集读取
         var assembly = typeof(App).Assembly;
         var informationalVersion = assembly
             .GetCustomAttribute<AssemblyInformationalVersionAttribute>()?
@@ -1268,7 +1306,15 @@ internal sealed class ApplicationInfoService : IApplicationInfoService
 
     public string GetAppCodenameText()
     {
-        return Codename;
+        // 优先从环境变量读取（Launcher 传递）
+        var envCodename = Environment.GetEnvironmentVariable(LanMountainDesktop.Shared.Contracts.Launcher.LauncherIpcConstants.CodenameEnvVar);
+        if (!string.IsNullOrWhiteSpace(envCodename))
+        {
+            return envCodename;
+        }
+
+        // 回退：使用默认开发代号
+        return DefaultCodename;
     }
 
     public AppRenderBackendInfo GetRenderBackendInfo()

LanMountainDesktop/Services/SingleInstanceService.cs

@@ -9,6 +9,10 @@ namespace LanMountainDesktop.Services;
 
 public sealed class SingleInstanceService : IDisposable
 {
+    private const byte ActivationRequestCode = 0x41; // 'A'
+    private const byte ActivationAckCode = 0x4B; // 'K'
+    private const byte ActivationNackCode = 0x4E; // 'N'
+
     private readonly Mutex _mutex;
     private readonly string _pipeName;
     private readonly CancellationTokenSource _listenCts = new();
@@ -56,13 +60,24 @@ public sealed class SingleInstanceService : IDisposable
             return;
         }
 
+        AppLogger.Info(
+            "SingleInstance",
+            $"Starting activation listener. Pipe='{_pipeName}'; Pid={Environment.ProcessId}; OwnsMutex={_ownsMutex}.");
         _listenTask = Task.Run(() => ListenForActivationAsync(onActivationRequested, _listenCts.Token));
     }
 
     public bool TryNotifyPrimaryInstance(TimeSpan timeout)
+    {
+        return TryNotifyPrimaryInstance(timeout, out _);
+    }
+
+    public bool TryNotifyPrimaryInstance(TimeSpan timeout, out string? failureReason)
     {
         if (_ownsMutex || _disposed)
         {
+            failureReason = _ownsMutex
+                ? "current_instance_is_primary"
+                : "single_instance_service_disposed";
             return false;
         }
 
@@ -71,16 +86,38 @@ public sealed class SingleInstanceService : IDisposable
             using var client = new NamedPipeClientStream(
                 serverName: ".",
                 pipeName: _pipeName,
-                direction: PipeDirection.Out,
+                direction: PipeDirection.InOut,
                 options: PipeOptions.Asynchronous);
 
             client.Connect((int)Math.Max(1, timeout.TotalMilliseconds));
-            client.WriteByte(1);
+            client.WriteByte(ActivationRequestCode);
             client.Flush();
+
+            var ack = client.ReadByte();
+            var acknowledged = ack == ActivationAckCode;
+            if (!acknowledged)
+            {
+                failureReason = ack switch
+                {
+                    ActivationNackCode => "primary_rejected_activation",
+                    -1 => "ack_not_received",
+                    _ => $"unexpected_ack_code_{ack}"
+                };
+                AppLogger.Warn(
+                    "SingleInstance",
+                    $"Primary activation handshake failed. AckCode={ack}; Reason='{failureReason}'; Pipe='{_pipeName}'; Pid={Environment.ProcessId}.");
+                return false;
+            }
+
+            failureReason = null;
+            AppLogger.Info(
+                "SingleInstance",
+                $"Primary activation acknowledged. Pipe='{_pipeName}'; Pid={Environment.ProcessId}.");
             return true;
         }
         catch (Exception ex)
         {
+            failureReason = "primary_activation_handshake_exception";
             AppLogger.Warn("SingleInstance", "Failed to notify the primary instance.", ex);
             return false;
         }
@@ -128,14 +165,40 @@ public sealed class SingleInstanceService : IDisposable
             {
                 using var server = new NamedPipeServerStream(
                     _pipeName,
-                    PipeDirection.In,
+                    PipeDirection.InOut,
                     1,
                     PipeTransmissionMode.Byte,
                     PipeOptions.Asynchronous);
 
                 await server.WaitForConnectionAsync(cancellationToken).ConfigureAwait(false);
-                await server.ReadAsync(new byte[1], cancellationToken).ConfigureAwait(false);
-                onActivationRequested();
+                var buffer = new byte[1];
+                var readBytes = await server.ReadAsync(buffer, cancellationToken).ConfigureAwait(false);
+                var isActivationRequest = readBytes == 1 && buffer[0] == ActivationRequestCode;
+                var ackCode = ActivationAckCode;
+
+                if (!isActivationRequest)
+                {
+                    ackCode = ActivationNackCode;
+                    AppLogger.Warn(
+                        "SingleInstance",
+                        $"Received malformed activation request. ReadBytes={readBytes}; Value={(readBytes == 1 ? buffer[0] : -1)}; Pipe='{_pipeName}'.");
+                }
+                else
+                {
+                    try
+                    {
+                        onActivationRequested();
+                    }
+                    catch (Exception ex)
+                    {
+                        ackCode = ActivationNackCode;
+                        AppLogger.Warn("SingleInstance", "Activation callback failed.", ex);
+                    }
+                }
+
+                var ackBuffer = new[] { ackCode };
+                await server.WriteAsync(ackBuffer, cancellationToken).ConfigureAwait(false);
+                await server.FlushAsync(cancellationToken).ConfigureAwait(false);
             }
             catch (OperationCanceledException)
             {

LanMountainDesktop/Services/TelemetryEvent.cs

@@ -1,55 +0,0 @@
-using System;
-using System.Collections.Generic;
-using System.Linq;
-
-namespace LanMountainDesktop.Services;
-
-internal sealed record TelemetryEvent(
-    string EventName,
-    string DistinctId,
-    string InstallId,
-    string TelemetryId,
-    string SessionId,
-    long Sequence,
-    DateTimeOffset Timestamp,
-    IReadOnlyDictionary<string, object?> Payload,
-    IReadOnlyDictionary<string, object?>? StateBefore = null,
-    IReadOnlyDictionary<string, object?>? StateAfter = null)
-{
-    public Dictionary<string, object?> ToPostHogProperties()
-    {
-        var properties = new Dictionary<string, object?>(StringComparer.OrdinalIgnoreCase)
-        {
-            ["install_id"] = InstallId,
-            ["telemetry_id"] = TelemetryId,
-            ["session_id"] = SessionId,
-            ["sequence"] = Sequence,
-            ["timestamp_utc"] = Timestamp.ToString("o"),
-            ["app_version"] = TelemetryEnvironmentInfo.GetAppVersion(),
-            ["os_name"] = TelemetryEnvironmentInfo.GetOsName(),
-            ["os_version"] = TelemetryEnvironmentInfo.GetOsVersion(),
-            ["device_model"] = TelemetryEnvironmentInfo.GetDeviceModel(),
-            ["device_arch"] = TelemetryEnvironmentInfo.GetDeviceArchitecture(),
-            ["runtime_version"] = TelemetryEnvironmentInfo.GetRuntimeVersion(),
-            ["language"] = TelemetryEnvironmentInfo.GetSystemLanguage(),
-            ["payload"] = Copy(Payload)
-        };
-
-        if (StateBefore is not null && StateBefore.Count > 0)
-        {
-            properties["state_before"] = Copy(StateBefore);
-        }
-
-        if (StateAfter is not null && StateAfter.Count > 0)
-        {
-            properties["state_after"] = Copy(StateAfter);
-        }
-
-        return properties;
-    }
-
-    private static Dictionary<string, object?> Copy(IReadOnlyDictionary<string, object?> source)
-    {
-        return source.ToDictionary(entry => entry.Key, entry => entry.Value, StringComparer.OrdinalIgnoreCase);
-    }
-}

LanMountainDesktop/Services/UpdateSettingsValues.cs

@@ -11,6 +11,7 @@ public static class UpdateSettingsValues
     public const string ModeDownloadThenConfirm = "download_then_confirm";
     public const string ModeSilentOnExit = "silent_on_exit";
 
+    public const string DownloadSourcePdc = "pdc";
     public const string DownloadSourceGitHub = "github";
     public const string DownloadSourceGhProxy = "gh-proxy";
 
@@ -51,9 +52,23 @@ public static class UpdateSettingsValues
 
     public static string NormalizeDownloadSource(string? value)
     {
-        return string.Equals(value, DownloadSourceGhProxy, StringComparison.OrdinalIgnoreCase)
-            ? DownloadSourceGhProxy
-            : DownloadSourceGitHub;
+        if (string.Equals(value, DownloadSourcePdc, StringComparison.OrdinalIgnoreCase))
+        {
+            return DownloadSourcePdc;
+        }
+
+        if (string.Equals(value, DownloadSourceGhProxy, StringComparison.OrdinalIgnoreCase))
+        {
+            return DownloadSourceGhProxy;
+        }
+
+        if (string.Equals(value, DownloadSourceGitHub, StringComparison.OrdinalIgnoreCase))
+        {
+            return DownloadSourceGitHub;
+        }
+
+        // Default to PDC. Runtime will fallback to GitHub if PDC is unavailable.
+        return DownloadSourcePdc;
     }
 
     public static int NormalizeDownloadThreads(int value)

LanMountainDesktop/Services/UpdateWorkflowService.cs

@@ -1,8 +1,11 @@
 using System;
+using System.Collections.Generic;
 using System.ComponentModel;
 using System.Diagnostics;
 using System.Globalization;
 using System.IO;
+using System.Linq;
+using System.Runtime.InteropServices;
 using System.Threading;
 using System.Threading.Tasks;
 using LanMountainDesktop.PluginSdk;
@@ -47,6 +50,13 @@ public sealed class UpdateWorkflowService
     private readonly ISettingsFacadeService _settingsFacade;
     private readonly string _updatesDirectory;
 
+    private const string LauncherDirectoryName = ".launcher";
+    private const string UpdateDirectoryName = "update";
+    private const string IncomingDirectoryName = "incoming";
+    private const string SignedFileMapName = "files.json";
+    private const string SignedFileMapSignatureName = "files.json.sig";
+    private const string UpdateArchiveName = "update.zip";
+
     public UpdateWorkflowService(ISettingsFacadeService settingsFacade)
     {
         _settingsFacade = settingsFacade ?? throw new ArgumentNullException(nameof(settingsFacade));
@@ -56,6 +66,218 @@ public sealed class UpdateWorkflowService
             "Updates");
     }
 
+    /// <summary>
+    /// Gets the path to the Launcher's incoming update directory where delta packages should be placed.
+    /// </summary>
+    public static string GetLauncherIncomingDirectory()
+    {
+        // The app runs from app-{version}/ subdirectory; Launcher root is one level up.
+        var appBaseDir = AppContext.BaseDirectory;
+        var launcherRoot = Path.GetDirectoryName(appBaseDir.TrimEnd(Path.DirectorySeparatorChar, Path.AltDirectorySeparatorChar));
+        if (string.IsNullOrWhiteSpace(launcherRoot))
+        {
+            launcherRoot = appBaseDir;
+        }
+        return Path.Combine(launcherRoot, LauncherDirectoryName, UpdateDirectoryName, IncomingDirectoryName);
+    }
+
+    /// <summary>
+    /// Checks whether a GitHub Release contains signed file-map assets needed for incremental updates.
+    /// </summary>
+    public static bool IsDeltaUpdateAvailable(GitHubReleaseInfo release)
+    {
+        if (release is null || release.Assets is null || release.Assets.Count == 0)
+        {
+            return false;
+        }
+
+        return TryResolveDeltaAssets(release.Assets, out _, out _, out _);
+    }
+
+    /// <summary>
+    /// Downloads signed file-map assets to the Launcher's incoming directory.
+    /// </summary>
+    public async Task<UpdateDownloadResult> DownloadDeltaUpdateAsync(
+        UpdateCheckResult checkResult,
+        IProgress<double>? progress = null,
+        CancellationToken cancellationToken = default)
+    {
+        ArgumentNullException.ThrowIfNull(checkResult);
+
+        if (!checkResult.Success || !checkResult.IsUpdateAvailable || checkResult.Release is null)
+        {
+            return new UpdateDownloadResult(false, null, "No update available for delta download.");
+        }
+
+        if (!TryResolveDeltaAssets(checkResult.Release.Assets, out var manifestAsset, out var signatureAsset, out var archiveAsset))
+        {
+            return new UpdateDownloadResult(false, null, "Release does not contain compatible signed file-map assets.");
+        }
+
+        var incomingDir = GetLauncherIncomingDirectory();
+
+        try
+        {
+            Directory.CreateDirectory(incomingDir);
+        }
+        catch (Exception ex)
+        {
+            return new UpdateDownloadResult(false, null, $"Failed to create incoming directory: {ex.Message}");
+        }
+
+        var state = _settingsFacade.Update.Get();
+        var downloadSource = state.UpdateDownloadSource;
+        var downloadThreads = state.UpdateDownloadThreads;
+
+        var requiredAssets = new List<(GitHubReleaseAsset Asset, string DestinationFileName)>
+        {
+            (manifestAsset, SignedFileMapName),
+            (signatureAsset, SignedFileMapSignatureName),
+            (archiveAsset, UpdateArchiveName)
+        };
+
+        var totalAssets = requiredAssets.Count;
+        var completedAssets = 0;
+
+        foreach (var (asset, destinationFileName) in requiredAssets)
+        {
+            var destinationPath = Path.Combine(incomingDir, destinationFileName);
+
+            // Skip if already downloaded and file exists
+            if (File.Exists(destinationPath))
+            {
+                var existingHash = await GitHubReleaseUpdateService.ComputeFileSha256Async(destinationPath, cancellationToken);
+                if (asset.Sha256 is not null && string.Equals(existingHash, asset.Sha256, StringComparison.OrdinalIgnoreCase))
+                {
+                    AppLogger.Info("UpdateWorkflow", $"Update asset {asset.Name} already downloaded with matching hash, skipping.");
+                    completedAssets++;
+                    progress?.Report((double)completedAssets / totalAssets);
+                    continue;
+                }
+            }
+
+            var assetProgress = progress is null ? null : new Progress<double>(p =>
+            {
+                var overallProgress = ((double)completedAssets + p) / totalAssets;
+                progress.Report(overallProgress);
+            });
+
+            var result = await _settingsFacade.Update.DownloadAssetAsync(
+                asset,
+                destinationPath,
+                downloadSource,
+                downloadThreads,
+                assetProgress,
+                cancellationToken);
+
+            if (!result.Success)
+            {
+                // Clean up partially downloaded files
+                foreach (var file in requiredAssets.Select(a => a.DestinationFileName))
+                {
+                    try { File.Delete(Path.Combine(incomingDir, file)); } catch { }
+                }
+                return new UpdateDownloadResult(false, null, $"Failed to download update asset {asset.Name}: {result.ErrorMessage}");
+            }
+
+            completedAssets++;
+            progress?.Report((double)completedAssets / totalAssets);
+        }
+
+        // Save state indicating a signed file-map update is pending.
+        SaveState(state with
+        {
+            PendingUpdateInstallerPath = Path.Combine(incomingDir, SignedFileMapName),
+            PendingUpdateVersion = checkResult.LatestVersionText,
+            PendingUpdatePublishedAtUtcMs = checkResult.Release.PublishedAt == DateTimeOffset.MinValue
+                ? null
+                : checkResult.Release.PublishedAt.ToUnixTimeMilliseconds(),
+            LastUpdateCheckUtcMs = DateTimeOffset.UtcNow.ToUnixTimeMilliseconds(),
+            PendingUpdateSha256 = null
+        });
+
+        AppLogger.Info("UpdateWorkflow", $"Signed file-map update payload downloaded to {incomingDir}. Will be applied by Launcher on next startup.");
+
+        return new UpdateDownloadResult(true, Path.Combine(incomingDir, SignedFileMapName), null);
+    }
+
+    /// <summary>
+    /// Checks whether the pending update is managed by Launcher incoming payload.
+    /// </summary>
+    public bool IsPendingDeltaUpdate()
+    {
+        var state = _settingsFacade.Update.Get();
+        var pendingPath = state.PendingUpdateInstallerPath?.Trim();
+        if (string.IsNullOrWhiteSpace(pendingPath))
+        {
+            return false;
+        }
+
+        // Incoming payload updates are identified by files.json or incoming directory path.
+        return pendingPath.EndsWith(SignedFileMapName, StringComparison.OrdinalIgnoreCase)
+            || pendingPath.Contains(IncomingDirectoryName, StringComparison.OrdinalIgnoreCase);
+    }
+
+    private static bool TryResolveDeltaAssets(
+        IReadOnlyList<GitHubReleaseAsset> assets,
+        out GitHubReleaseAsset manifestAsset,
+        out GitHubReleaseAsset signatureAsset,
+        out GitHubReleaseAsset archiveAsset)
+    {
+        manifestAsset = default!;
+        signatureAsset = default!;
+        archiveAsset = default!;
+
+        if (assets is null || assets.Count == 0)
+        {
+            return false;
+        }
+
+        var platformSuffix = GetPlatformAssetSuffix();
+        var platformManifest = $"files-{platformSuffix}.json";
+        var platformSignature = $"files-{platformSuffix}.json.sig";
+        var platformArchive = $"update-{platformSuffix}.zip";
+
+        var manifestCandidate = FindAsset(assets, platformManifest) ?? FindAsset(assets, SignedFileMapName);
+        var signatureCandidate = FindAsset(assets, platformSignature) ?? FindAsset(assets, SignedFileMapSignatureName);
+        var archiveCandidate = FindAsset(assets, platformArchive) ?? FindAsset(assets, UpdateArchiveName);
+        if (manifestCandidate is null || signatureCandidate is null || archiveCandidate is null)
+        {
+            return false;
+        }
+
+        manifestAsset = manifestCandidate;
+        signatureAsset = signatureCandidate;
+        archiveAsset = archiveCandidate;
+        return true;
+    }
+
+    private static GitHubReleaseAsset? FindAsset(IReadOnlyList<GitHubReleaseAsset> assets, string name)
+    {
+        return assets.FirstOrDefault(a => string.Equals(a.Name, name, StringComparison.OrdinalIgnoreCase));
+    }
+
+    private static string GetPlatformAssetSuffix()
+    {
+        var os = OperatingSystem.IsWindows()
+            ? "windows"
+            : OperatingSystem.IsLinux()
+                ? "linux"
+                : OperatingSystem.IsMacOS()
+                    ? "macos"
+                    : "unknown";
+
+        var arch = RuntimeInformation.OSArchitecture switch
+        {
+            Architecture.X86 => "x86",
+            Architecture.Arm => "arm",
+            Architecture.Arm64 => "arm64",
+            _ => "x64"
+        };
+
+        return $"{os}-{arch}";
+    }
+
     public UpdatePendingInfo? GetPendingUpdate()
     {
         var state = _settingsFacade.Update.Get();
@@ -261,7 +483,7 @@ public sealed class UpdateWorkflowService
         {
             // Always check for updates on startup (removed AutoCheckUpdates check)
             var result = await CheckForUpdatesAsync(currentVersion, isForce: false, cancellationToken);
-            if (!result.Success || !result.IsUpdateAvailable || result.PreferredAsset is null)
+            if (!result.Success || !result.IsUpdateAvailable || result.Release is null)
             {
                 return;
             }
@@ -272,7 +494,16 @@ public sealed class UpdateWorkflowService
             if (string.Equals(normalizedMode, UpdateSettingsValues.ModeDownloadThenConfirm, StringComparison.OrdinalIgnoreCase) ||
                 string.Equals(normalizedMode, UpdateSettingsValues.ModeSilentOnExit, StringComparison.OrdinalIgnoreCase))
             {
-                await DownloadReleaseAsync(result, cancellationToken: cancellationToken);
+                // Prefer delta update if available (smaller download, faster)
+                if (IsDeltaUpdateAvailable(result.Release))
+                {
+                    AppLogger.Info("UpdateWorkflow", "Delta update available, downloading incremental package.");
+                    await DownloadDeltaUpdateAsync(result, cancellationToken: cancellationToken);
+                }
+                else if (result.PreferredAsset is not null)
+                {
+                    await DownloadReleaseAsync(result, cancellationToken: cancellationToken);
+                }
             }
             // For "Manual" mode, just check but don't download
         }
@@ -302,6 +533,19 @@ public sealed class UpdateWorkflowService
             return false;
         }
 
+        // For delta updates, launch the Launcher with apply-update command so it can
+        // apply the update immediately with a progress UI, matching the full installer experience.
+        if (IsPendingDeltaUpdate())
+        {
+            AppLogger.Info("UpdateWorkflow", "Delta update pending. Launching Launcher to apply update with progress UI.");
+            var launchResult = LaunchLauncherForApplyUpdate();
+            if (launchResult)
+            {
+                ClearPendingUpdate();
+            }
+            return launchResult;
+        }
+
         var result = LaunchPendingInstaller(silent: true, exitApplicationAfterLaunch: false);
         if (!result.Success && !string.IsNullOrWhiteSpace(result.ErrorMessage))
         {
@@ -311,6 +555,53 @@ public sealed class UpdateWorkflowService
         return result.Success;
     }
 
+    /// <summary>
+    /// Launches the Launcher process with the apply-update command to apply a pending delta update
+    /// with a progress UI, providing an experience similar to a full installer.
+    /// </summary>
+    public bool LaunchLauncherForApplyUpdate()
+    {
+        try
+        {
+            var launcherExeName = OperatingSystem.IsWindows()
+                ? "LanMountainDesktop.Launcher.exe"
+                : "LanMountainDesktop.Launcher";
+
+            // The Launcher is in the parent directory of the app's base directory
+            // (app runs from app-{version}/ subdirectory, Launcher is at root)
+            var appBaseDir = AppContext.BaseDirectory;
+            var launcherRoot = Path.GetDirectoryName(appBaseDir.TrimEnd(Path.DirectorySeparatorChar, Path.AltDirectorySeparatorChar));
+            if (string.IsNullOrWhiteSpace(launcherRoot))
+            {
+                launcherRoot = appBaseDir;
+            }
+
+            var launcherPath = Path.Combine(launcherRoot, launcherExeName);
+            if (!File.Exists(launcherPath))
+            {
+                AppLogger.Warn("UpdateWorkflow", $"Launcher executable not found at '{launcherPath}'. Falling back to next-startup apply.");
+                return false;
+            }
+
+            var startInfo = new ProcessStartInfo
+            {
+                FileName = launcherPath,
+                Arguments = $"apply-update --app-root \"{launcherRoot}\"",
+                UseShellExecute = false,
+                WorkingDirectory = launcherRoot
+            };
+
+            Process.Start(startInfo);
+            AppLogger.Info("UpdateWorkflow", $"Launched Launcher for apply-update: {launcherPath}");
+            return true;
+        }
+        catch (Exception ex)
+        {
+            AppLogger.Warn("UpdateWorkflow", $"Failed to launch Launcher for apply-update: {ex.Message}");
+            return false;
+        }
+    }
+
     public void ClearPendingUpdate()
     {
         var state = _settingsFacade.Update.Get();