fix: compare signing keys by SPKI instead of PEM text

.github/workflows/build.yml

@@ -32,6 +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 }}
@@ -68,10 +69,18 @@ jobs:
             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 }}
@@ -98,10 +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 }}
@@ -132,6 +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

@@ -25,12 +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

@@ -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 }}
@@ -108,7 +109,7 @@ jobs:
 
           Write-Host "Publishing Launcher with AOT for Windows $arch..."
 
-          # AOT 单文件发布
+          # AOT publish
           dotnet publish LanMountainDesktop.Launcher/LanMountainDesktop.Launcher.csproj `
             -c Release `
             -o ./$launcherPublishDir `
@@ -126,7 +127,7 @@ jobs:
             exit 1
           }
 
-          # 显示发布结果
+          # 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) {
@@ -134,7 +135,7 @@ jobs:
             Write-Host "Launcher executable: $($exeFile.Name) ($size MB)"
           }
 
-          # 清理不必要的文件（AOT 单文件应该只有一个 exe）
+          # 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"
@@ -219,8 +220,10 @@ jobs:
           Move-Item -Path $newStructure -Destination $publishDir -Force
         shell: pwsh
 
-      - name: Install Inno Setup
-        run: choco install innosetup -y --no-progress
+      - name: Install Inno Setup and 7z
+        run: |
+          choco install innosetup -y --no-progress
+          choco install 7zip -y --no-progress
         shell: pwsh
 
       - name: Build Installer
@@ -314,207 +317,92 @@ jobs:
           Write-Host "Installer size: $([Math]::Round($installerFile.Length / 1MB, 2)) MB"
         shell: pwsh
 
-      - name: Generate Delta Package
-        if: matrix.self_contained == true && matrix.arch == 'x64'
+      - name: Build Signed FileMap Update Package
+        if: matrix.self_contained == true
         run: |
+          $ErrorActionPreference = "Stop"
+
           $version = "${{ needs.prepare.outputs.version }}"
-          $publishDir = "publish/windows-${{ matrix.arch }}"
+          $arch = "${{ matrix.arch }}"
+          $platform = "windows-$arch"
+          $publishDir = "publish/windows-$arch"
           $appDir = "app-$version"
           $currentAppPath = Join-Path $publishDir $appDir
-          $outputDir = "delta-output"
+          $outputDir = Join-Path "delta-output" $platform
+          $generateScript = "scripts/Generate-DeltaPackage.ps1"
+          $signScript = "scripts/Sign-FileMap.ps1"
 
-          New-Item -ItemType Directory -Path $outputDir -Force | Out-Null
-
-          # --- Determine previous version and download its update.zip for diff ---
-          $previousVersion = $null
-          $previousAppPath = $null
-          try {
-            $headers = @{ "User-Agent" = "LanMountainDesktop-CI"; "Authorization" = "token ${{ secrets.GITHUB_TOKEN }}" }
-            $releases = Invoke-RestMethod -Uri "https://api.github.com/repos/${{ github.repository }}/releases?per_page=10" -Headers $headers
-            $previousRelease = $releases | Where-Object { -not $_.prerelease -and -not $_.draft } | Select-Object -First 1
-            if ($previousRelease) {
-              $previousVersion = $previousRelease.tag_name.TrimStart('v','V')
-              Write-Host "Previous release version: $previousVersion"
-
-              # Try to download update.zip from previous release for diff
-              $prevUpdateZip = $previousRelease.assets | Where-Object { $_.name -eq "update.zip" } | Select-Object -First 1
-              if ($prevUpdateZip) {
-                Write-Host "Found update.zip in previous release - extracting for diff..."
-                $prevZipDest = Join-Path $outputDir "prev-update.zip"
-                Invoke-WebRequest -Uri $prevUpdateZip.browser_download_url -OutFile $prevZipDest -Headers $headers
-
-                $previousAppPath = Join-Path $outputDir "prev-app"
-                New-Item -ItemType Directory -Path $previousAppPath -Force | Out-Null
-                Expand-Archive -Path $prevZipDest -DestinationPath $previousAppPath -Force
-                Remove-Item -Path $prevZipDest -Force
-
-                $prevFileCount = (Get-ChildItem -Path $previousAppPath -Recurse -File).Count
-                Write-Host "Extracted $prevFileCount files from previous version for diff"
-              } else {
-                Write-Host "No update.zip found in previous release - will generate full package"
-              }
-            }
-          } catch {
-            Write-Host "Could not fetch previous release: $_"
-          }
-
-          # --- Generate file manifest with diff against previous version ---
-          Write-Host "Generating update package for version $version..."
-          $files = Get-ChildItem -Path $currentAppPath -Recurse -File
-          $fileEntries = [System.Collections.ArrayList]::new()
-          $changedFiles = [System.Collections.ArrayList]::new()
-          $reusedCount = 0
-          $addedCount = 0
-          $replacedCount = 0
-          $deletedCount = 0
-
-          # Build hash map of previous version files for quick lookup
-          $prevHashMap = @{}
-          if ($previousAppPath -and (Test-Path $previousAppPath)) {
-            $prevFiles = Get-ChildItem -Path $previousAppPath -Recurse -File
-            foreach ($pf in $prevFiles) {
-              $relPath = $pf.FullName.Substring($previousAppPath.Length).TrimStart('\', '/').Replace('\', '/')
-              if ($relPath -match '^\.(current|partial|destroy)$') { continue }
-              $prevHashMap[$relPath] = (Get-FileHash -Path $pf.FullName -Algorithm SHA256).Hash.ToLower()
-            }
-            Write-Host "Previous version has $($prevHashMap.Count) files for comparison"
-          }
-
-          foreach ($file in $files) {
-            $relativePath = $file.FullName.Substring($currentAppPath.Length).TrimStart('\', '/')
-            $relativePath = $relativePath.Replace('\', '/')
-
-            # Skip deployment marker files
-            if ($relativePath -match '^\.(current|partial|destroy)$') {
-              continue
-            }
-
-            $hash = (Get-FileHash -Path $file.FullName -Algorithm SHA256).Hash.ToLower()
-
-            if ($prevHashMap.ContainsKey($relativePath)) {
-              $prevHash = $prevHashMap[$relativePath]
-              if ($hash -eq $prevHash) {
-                $fileEntries += @{ Path = $relativePath; Action = "reuse"; Sha256 = $hash }
-                $reusedCount++
-              } else {
-                $fileEntries += @{ Path = $relativePath; Action = "replace"; Sha256 = $hash; ArchivePath = $relativePath }
-                $changedFiles += $file
-                $replacedCount++
-              }
-              $prevHashMap.Remove($relativePath)
-            } else {
-              $fileEntries += @{ Path = $relativePath; Action = "add"; Sha256 = $hash; ArchivePath = $relativePath }
-              $changedFiles += $file
-              $addedCount++
-            }
-          }
-
-          # Files in previous version but not in current = deleted
-          foreach ($deletedPath in $prevHashMap.Keys) {
-            $fileEntries += @{ Path = $deletedPath; Action = "delete" }
-            $deletedCount++
-          }
-
-          Write-Host "Delta summary: $reusedCount reused, $replacedCount replaced, $addedCount added, $deletedCount deleted"
-          Write-Host "Changed files to include in update.zip: $($changedFiles.Count)"
-
-          $filesJson = @{
-            FromVersion = $previousVersion
-            ToVersion = $version
-            Platform = "windows"
-            Arch = "x64"
-            Files = $fileEntries
-          } | ConvertTo-Json -Depth 10
-
-          $filesJsonPath = Join-Path $outputDir "files.json"
-          $filesJson | Set-Content -Path $filesJsonPath -Encoding UTF8
-          Write-Host "Generated files.json with $($fileEntries.Count) entries"
-
-          # Create update.zip with only changed files
-          $tempDir = Join-Path $outputDir "temp_staging"
-          New-Item -ItemType Directory -Path $tempDir -Force | Out-Null
-          foreach ($file in $changedFiles) {
-            $relativePath = $file.FullName.Substring($currentAppPath.Length).TrimStart('\', '/')
-            $destPath = Join-Path $tempDir $relativePath
-            $destDir = Split-Path -Parent $destPath
-            if (-not (Test-Path $destDir)) { New-Item -ItemType Directory -Path $destDir -Force | Out-Null }
-            Copy-Item -Path $file.FullName -Destination $destPath -Force
-          }
-
-          $updateZipPath = Join-Path $outputDir "update.zip"
-          if ($changedFiles.Count -gt 0) {
-            Compress-Archive -Path "$tempDir\*" -DestinationPath $updateZipPath -CompressionLevel Optimal
-          } else {
-            # No changed files - create a minimal zip
-            $emptyMarker = Join-Path $tempDir ".no-changes"
-            Set-Content -Path $emptyMarker -Value ""
-            Compress-Archive -Path "$tempDir\*" -DestinationPath $updateZipPath -CompressionLevel Optimal
-          }
-          Remove-Item -Path $tempDir -Recurse -Force
-
-          Write-Host "Created update.zip: $([Math]::Round((Get-Item $updateZipPath).Length / 1MB, 2)) MB"
-
-          # Clean up previous version extraction
-          if ($previousAppPath -and (Test-Path $previousAppPath)) {
-            Remove-Item -Path $previousAppPath -Recurse -Force -ErrorAction SilentlyContinue
-          }
-        shell: pwsh
-
-      - name: Sign File Map
-        if: matrix.self_contained == true && matrix.arch == 'x64'
-        run: |
-          $outputDir = "delta-output"
-          $filesJsonPath = Join-Path $outputDir "files.json"
-          $signaturePath = Join-Path $outputDir "files.json.sig"
-
-          if (-not (Test-Path $filesJsonPath)) {
-            Write-Error "files.json not found at $filesJsonPath"
+          if (-not (Test-Path $currentAppPath)) {
+            Write-Error "Expected app directory not found: $currentAppPath"
             exit 1
           }
 
-          $privateKeyPem = "${{ secrets.UPDATE_PRIVATE_KEY_PEM }}"
+          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)) {
-            Write-Warning "UPDATE_PRIVATE_KEY_PEM secret not configured - generating unsigned placeholder"
-            Set-Content -Path $signaturePath -Value "" -Encoding ASCII
-            exit 0
+            $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
           }
 
-          $privateKeyPath = Join-Path $env:RUNNER_TEMP "signing-key.pem"
-          Set-Content -Path $privateKeyPath -Value $privateKeyPem -Encoding ASCII
+          $privateKeyPem = $privateKeyPem -replace '\\n', "`n"
+          $tempDir = Join-Path $env:RUNNER_TEMP "update-signing"
+          New-Item -ItemType Directory -Path $tempDir -Force | Out-Null
 
-          Add-Type -ReferencedAssemblies @("System.Security.Cryptography", "System.IO") -TypeDefinition @"
-          using System;
-          using System.IO;
-          using System.Security.Cryptography;
-          public class RsaSigner {
-              public static void Sign(string jsonPath, string keyPath, string sigPath) {
-                  var jsonBytes = File.ReadAllBytes(jsonPath);
-                  var rsa = RSA.Create();
-                  rsa.ImportFromPem(File.ReadAllText(keyPath));
-                  var sig = rsa.SignData(jsonBytes, HashAlgorithmName.SHA256, RSASignaturePadding.Pkcs1);
-                  File.WriteAllText(sigPath, Convert.ToBase64String(sig));
-              }
+          $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
           }
-          "@
 
-          [RsaSigner]::Sign($filesJsonPath, $privateKeyPath, $signaturePath)
-          Remove-Item -Path $privateKeyPath -Force
+          & $signScript `
+            -FilesJsonPath (Join-Path $outputDir "files.json") `
+            -PrivateKeyPath $privateKeyPath `
+            -OutputPath (Join-Path $outputDir "files.json.sig")
 
-          Write-Host "Signed files.json -> 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 Delta Package
-        if: matrix.self_contained == true && matrix.arch == 'x64'
+      - name: Upload Signed FileMap Update Package
+        if: matrix.self_contained == true
         uses: actions/upload-artifact@v4
         with:
-          name: release-delta-windows-x64
+          name: release-update-windows-${{ matrix.arch }}
           path: |
-            delta-output/files.json
-            delta-output/files.json.sig
-            delta-output/update.zip
+            delta-output/windows-${{ 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:
@@ -546,10 +434,18 @@ jobs:
             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 }}
@@ -712,6 +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:
@@ -736,10 +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 }}
@@ -910,8 +894,8 @@ jobs:
           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 delta update files (files.json, files.json.sig, update.zip)
-          find artifacts -type f \( -name "files.json" -o -name "files.json.sig" -o -name "update.zip" \) -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"
@@ -924,6 +908,44 @@ jobs:
             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:
@@ -945,12 +967,12 @@ jobs:
 
             Installation: Double-click the .exe file and follow the wizard.
 
-            ### Incremental Update (Windows x64)
-            - **files.json** - Update manifest listing changed files
-            - **files.json.sig** - RSA signature of the manifest
-            - **update.zip** - Archive containing changed files
+            ### 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: The app will automatically detect and apply the incremental update on next launch.
+            Existing users: Launcher will detect platform-matching signed assets and apply update on next startup.
 
             ### Linux
             - **LanMountainDesktop-${{ needs.prepare.outputs.version }}-linux-x64.deb** - Debian package (x64)

.gitignore

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

.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).

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

@@ -1,8 +1,11 @@
 -----BEGIN RSA PUBLIC KEY-----
-MIIBCgKCAQEAxPqgXsrnG8Re0kV4HBb+x61HQpjCahJoilzKvvlnXanuGtGxbjZT
-B+kMzmPUwyx8gt1fcaBNoKPwpwP0UZRWjvJDZQ++5ex7LGGw0YRWtJmeeigS17YI
-90vEfX3xQ5InJoBKnndsRy2a742chE6YwHGrJ4b107ZJ+zd26FmokQS47Uzay3go
-msbQHdehwCdCiW1mh8YFDm0xny+PYoYZkGXiDOYY0nvg4yJ/BG2fQkkC5TNizr0l
-YcE3RrMRcyJB7zU3jN1QnjHIvIvwfCOXaLdcXtxgQFRv45sYpmj9amNjuurM5iUa
-20Mk1ilYBuLxqe6P9C8DakZY/akVxpzxrQIDAQAB
------END RSA PUBLIC KEY-----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+-----END RSA PUBLIC KEY-----

LanMountainDesktop.Launcher/LanMountainDesktop.Launcher.AOT.props

@@ -56,7 +56,11 @@
     <!-- 允许 IL 警告 -->
     <TrimmerSingleWarn>false</TrimmerSingleWarn>
     
-    <!-- FluentAvaloniaUI 需要：启用反射序列化（AOT 兼容模式） -->
-    <JsonSerializerIsReflectionEnabledByDefault>true</JsonSerializerIsReflectionEnabledByDefault>
+    <!-- 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/Services/Commands.cs

@@ -91,11 +91,7 @@ internal static class Commands
             "check" => updateEngine.CheckPendingUpdate(),
             "apply" => await updateEngine.ApplyPendingUpdateAsync().ConfigureAwait(false),
             "rollback" => updateEngine.RollbackLatest(),
-            "download" => 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),
+            "download" => await DownloadUpdatePayloadAsync(context, updateEngine).ConfigureAwait(false),
             _ => new LauncherResult
             {
                 Success = false,
@@ -106,6 +102,15 @@ internal static class Commands
         };
     }
 
+    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,
@@ -149,10 +154,7 @@ internal static class Commands
             Directory.CreateDirectory(dir);
         }
 
-        var json = JsonSerializer.Serialize(result, new JsonSerializerOptions
-        {
-            WriteIndented = true
-        });
+        var json = JsonSerializer.Serialize(result, AppJsonContext.Default.LauncherResult);
         await File.WriteAllTextAsync(fullPath, json, Encoding.UTF8).ConfigureAwait(false);
     }
 

LanMountainDesktop.Launcher/Services/DeploymentLocator.cs

@@ -322,7 +322,7 @@ internal sealed class DeploymentLocator
                         try
                         {
                             var json = File.ReadAllText(snapshotFile);
-                            var snapshot = System.Text.Json.JsonSerializer.Deserialize<SnapshotMetadata>(json);
+                            var snapshot = System.Text.Json.JsonSerializer.Deserialize(json, AppJsonContext.Default.SnapshotMetadata);
                             if (snapshot != null && !string.IsNullOrEmpty(snapshot.SourceDirectory))
                             {
                                 if (Directory.Exists(snapshot.SourceDirectory))
@@ -445,7 +445,7 @@ internal sealed class DeploymentLocator
                 try
                 {
                     var json = File.ReadAllText(versionFile);
-                    var info = JsonSerializer.Deserialize<AppVersionInfo>(json);
+                    var info = JsonSerializer.Deserialize(json, AppJsonContext.Default.AppVersionInfo);
                     if (info is not null)
                     {
                         return info;

LanMountainDesktop.Launcher/Services/FlexibleHostLocator.cs

@@ -159,7 +159,7 @@ namespace LanMountainDesktop.Launcher.Services;
         try
         {
             var json = File.ReadAllText(configPath);
-            var config = JsonSerializer.Deserialize<HostDiscoveryConfig>(json);
+            var config = JsonSerializer.Deserialize(json, AppJsonContext.Default.HostDiscoveryConfig);
             if (config?.HostPath != null && File.Exists(config.HostPath))
             {
                 return config.HostPath;
@@ -617,13 +617,13 @@ namespace LanMountainDesktop.Launcher.Services;
         public required string AppRoot { get; set; }
         public required HostDiscoveryOptions Options { get; set; }
     }
-
-    /// <summary>
-    /// 发现配置文件
-    /// </summary>
-    private class HostDiscoveryConfig
-    {
-        public string? HostPath { get; set; }
-        public List<string>? AdditionalPaths { 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/Ipc/LauncherIpcServer.cs

@@ -143,7 +143,7 @@ public class LauncherIpcServer : IDisposable
 
                     // 3. 反序列化并回调
                     var json = System.Text.Encoding.UTF8.GetString(payloadBuffer, 0, payloadLength);
-                    var message = JsonSerializer.Deserialize<StartupProgressMessage>(json);
+                    var message = JsonSerializer.Deserialize(json, AppJsonContext.Default.StartupProgressMessage);
                     if (message is not null)
                     {
                         _onProgress(message);

LanMountainDesktop.Launcher/Services/LauncherFlowCoordinator.cs

@@ -9,6 +9,15 @@ 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;
@@ -41,6 +50,18 @@ internal sealed class LauncherFlowCoordinator
             // 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(() =>
             {
@@ -51,9 +72,23 @@ internal sealed class LauncherFlowCoordinator
 
             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 =>
             {
@@ -61,12 +96,29 @@ internal sealed class LauncherFlowCoordinator
                 {
                     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 ?? "");
                         
-                        // 主程序报告就绪后，关闭 Splash 窗口
-                        if (msg.Stage == StartupStage.Ready && splashWindow.IsVisible && splashWindow.IsLoaded)
+                        // 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)
                         {
-                            splashWindow.Close();
+                            if (splashWindow.IsVisible && splashWindow.IsLoaded)
+                            {
+                                splashWindow.Close();
+                            }
+                            loadingDetailsWindow?.Close();
                             hostReadyTcs.TrySetResult();
                         }
                     }
@@ -121,20 +173,62 @@ internal sealed class LauncherFlowCoordinator
                 // 维持 IPC 管道服务端供主程序报告启动进度。
                 if (hostProcess is not null)
                 {
-                    // 等待主程序就绪或进程退出（取先发生者）
-                    // 如果主程序在 60 秒内未报告 Ready，也关闭 Splash 窗口作为超时保护
-                    var readyOrTimeout = Task.WhenAny(
-                        hostReadyTcs.Task,
-                        Task.Delay(TimeSpan.FromSeconds(60)));
-                    
                     var processExitTask = hostProcess.WaitForExitAsync();
                     
-                    // 先等待就绪/超时，然后等待进程退出
-                    await readyOrTimeout;
+                    // 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
@@ -151,7 +245,11 @@ internal sealed class LauncherFlowCoordinator
                         });
                     }
                     
-                    await processExitTask;
+                    // 继续等待主程序进程退出（如果它还在运行）
+                    if (!hostProcess.HasExited)
+                    {
+                        await processExitTask;
+                    }
                 }
                 else
                 {
@@ -200,6 +298,133 @@ internal sealed class LauncherFlowCoordinator
         }
     }
 
+    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）
@@ -236,36 +461,62 @@ internal sealed class LauncherFlowCoordinator
             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 = false,
-            WorkingDirectory = Path.GetDirectoryName(hostPath) ?? _deploymentLocator.GetAppRoot()
+            UseShellExecute = true,
+            WorkingDirectory = hostWorkingDir,
+            Arguments = arguments.ToString()
         };
 
-        // 转发命令行参数给主程序（排除 Launcher 自己的命令和选项）
-        foreach (var arg in _context.RawArgs)
-        {
-            // 跳过 Launcher 自己的命令和选项，只传递用户原始参数
-            if (arg == _context.Command || arg == _context.SubCommand || arg.StartsWith("--"))
-            {
-                continue;
-            }
-            processStartInfo.ArgumentList.Add(arg);
-        }
-
-        // 传递环境变量供 IPC 使用
+        // 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();
-        
-        // 传递版本信息
-        var versionInfo = _deploymentLocator.GetVersionInfo();
         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,
@@ -341,6 +592,99 @@ internal sealed class LauncherFlowCoordinator
         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())

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/PluginInstallerService.cs

@@ -73,7 +73,7 @@ internal sealed class PluginInstallerService
         using var stream = entries[0].Open();
         using var reader = new StreamReader(stream);
         var json = reader.ReadToEnd();
-        var manifest = JsonSerializer.Deserialize<PluginManifest>(json);
+        var manifest = JsonSerializer.Deserialize(json, AppJsonContext.Default.PluginManifest);
         if (manifest == null)
         {
             throw new InvalidOperationException($"Failed to deserialize manifest from '{packagePath}'.");

LanMountainDesktop.Launcher/Services/PluginUpgradeQueueService.cs

@@ -29,7 +29,7 @@ internal sealed class PluginUpgradeQueueService
         }
 
         var text = File.ReadAllText(pendingPath);
-        var pending = JsonSerializer.Deserialize<List<PendingUpgrade>>(text) ?? [];
+        var pending = JsonSerializer.Deserialize(text, AppJsonContext.Default.ListPendingUpgrade) ?? [];
         var failures = new List<string>();
         var succeeded = new List<PendingUpgrade>();
 
@@ -63,10 +63,7 @@ internal sealed class PluginUpgradeQueueService
         }
         else
         {
-            File.WriteAllText(pendingPath, JsonSerializer.Serialize(remaining, new JsonSerializerOptions
-            {
-                WriteIndented = true
-            }));
+            File.WriteAllText(pendingPath, JsonSerializer.Serialize(remaining, AppJsonContext.Default.ListPendingUpgrade));
         }
 
         return new LauncherResult
@@ -79,19 +76,19 @@ internal sealed class PluginUpgradeQueueService
                 : $"Applied {succeeded.Count} upgrades, failed: {string.Join(", ", failures)}."
         };
     }
+}
 
-    private sealed record PendingUpgrade(
-        string PluginId,
-        string SourcePackagePath,
-        string TargetVersion,
-        DateTimeOffset CreatedAt)
+internal sealed record PendingUpgrade(
+    string PluginId,
+    string SourcePackagePath,
+    string TargetVersion,
+    DateTimeOffset CreatedAt)
+{
+    public bool IsValid()
     {
-        public bool IsValid()
-        {
-            return !string.IsNullOrWhiteSpace(PluginId) &&
-                   !string.IsNullOrWhiteSpace(SourcePackagePath) &&
-                   !string.IsNullOrWhiteSpace(TargetVersion) &&
-                   File.Exists(SourcePackagePath);
-        }
+        return !string.IsNullOrWhiteSpace(PluginId) &&
+               !string.IsNullOrWhiteSpace(SourcePackagePath) &&
+               !string.IsNullOrWhiteSpace(TargetVersion) &&
+               File.Exists(SourcePackagePath);
     }
 }

LanMountainDesktop.Launcher/Services/UpdateCheckService.cs

@@ -15,7 +15,6 @@ internal sealed class UpdateCheckService
     private readonly string _repoOwner;
     private readonly string _repoName;
     private readonly HttpClient _httpClient;
-    private readonly JsonSerializerOptions _jsonOptions;
 
     public UpdateCheckService(string repoOwner, string repoName)
     {
@@ -24,12 +23,6 @@ internal sealed class UpdateCheckService
         _httpClient = new HttpClient();
         _httpClient.DefaultRequestHeaders.Add("User-Agent", "LanMountainDesktop-Launcher");
         _httpClient.DefaultRequestHeaders.Add("Accept", "application/vnd.github+json");
-
-        _jsonOptions = new JsonSerializerOptions
-        {
-            PropertyNameCaseInsensitive = true,
-            PropertyNamingPolicy = JsonNamingPolicy.SnakeCaseLower
-        };
     }
 
     /// <summary>
@@ -97,7 +90,7 @@ internal sealed class UpdateCheckService
         response.EnsureSuccessStatusCode();
 
         var json = await response.Content.ReadAsStringAsync(cancellationToken);
-        var releases = JsonSerializer.Deserialize<List<GitHubRelease>>(json, _jsonOptions);
+        var releases = JsonSerializer.Deserialize(json, AppJsonContext.Default.ListGitHubRelease);
 
         return releases?.Select(r => new ReleaseInfo
         {
@@ -131,38 +124,38 @@ internal sealed class UpdateCheckService
         var cleaned = ParseVersionString(versionString);
         return Version.TryParse(cleaned, out var version) ? version : new Version(0, 0, 0);
     }
-
-    // GitHub API 响应模型
-    private 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; }
-    }
-
-    private 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; }
-    }
+}
+
+// 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

@@ -48,7 +48,7 @@ internal sealed class UpdateEngineService
         }
 
         var fileMapText = File.ReadAllText(fileMapPath);
-        var fileMap = JsonSerializer.Deserialize<SignedFileMap>(fileMapText);
+        var fileMap = JsonSerializer.Deserialize(fileMapText, AppJsonContext.Default.SignedFileMap);
         if (fileMap is null)
         {
             return Failed("update.check", "invalid_manifest", "files.json is invalid.");
@@ -137,7 +137,7 @@ internal sealed class UpdateEngineService
         }
 
         var fileMapText = await File.ReadAllTextAsync(fileMapPath);
-        var fileMap = JsonSerializer.Deserialize<SignedFileMap>(fileMapText);
+        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.");
@@ -438,7 +438,7 @@ internal sealed class UpdateEngineService
             return Failed("update.rollback", "no_snapshot", "No snapshot found.");
         }
 
-        var snapshot = JsonSerializer.Deserialize<SnapshotMetadata>(File.ReadAllText(snapshotPath));
+        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.");
@@ -656,10 +656,7 @@ internal sealed class UpdateEngineService
 
     private static void SaveSnapshot(string path, SnapshotMetadata snapshot)
     {
-        File.WriteAllText(path, JsonSerializer.Serialize(snapshot, new JsonSerializerOptions
-        {
-            WriteIndented = true
-        }));
+        File.WriteAllText(path, JsonSerializer.Serialize(snapshot, AppJsonContext.Default.SnapshotMetadata));
     }
 
     private static LauncherResult Failed(string stage, string code, string message)

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.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/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/App.axaml.cs

@@ -20,6 +20,7 @@ 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;
@@ -74,6 +75,10 @@ public partial class App : Application
     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 =>
@@ -139,7 +144,7 @@ public partial class App : Application
         EnsureNotificationService();
     }
 
-    public override async void OnFrameworkInitializationCompleted()
+    public override void OnFrameworkInitializationCompleted()
     {
         if (Design.IsDesignMode)
         {
@@ -149,12 +154,8 @@ public partial class App : Application
 
         AppLogger.Info("App", "Framework initialization completed.");
         
-        // 初始化 Launcher IPC 客户端（如果从 Launcher 启动）
-        await InitializeLauncherIpcAsync();
-        
         RegisterUiUnhandledExceptionGuard();
         LinuxDesktopEntryInstaller.EnsureInstalled();
-        ReportStartupProgress(StartupStage.LoadingSettings, 20, "正在加载设置...");
         DesktopBootstrap.InitializeApplication(this, InitializeDesktopShell);
 
         if (!Design.IsDesignMode && OperatingSystem.IsWindows())
@@ -163,6 +164,10 @@ 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()
@@ -178,7 +183,18 @@ public partial class App : Application
             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)
@@ -213,6 +229,41 @@ public partial class App : Application
         });
     }
 
+    /// <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()
     {
         RequestedThemeVariant = ThemeVariant.Light;
@@ -241,16 +292,20 @@ public partial class App : Application
                 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(
@@ -610,70 +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()
     {
@@ -836,6 +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)
@@ -886,6 +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();
@@ -927,10 +1081,57 @@ public partial class App : Application
         AppLogger.Info("App", $"Main window created. Reason='{reason}'. LogFile={AppLogger.LogFilePath}");
         LogBrowserStartupDiagnostics();
         SetDesktopShellState(DesktopShellState.ForegroundDesktop, $"MainWindowCreated:{reason}");
-        ReportStartupProgress(StartupStage.Ready, 100, "就绪");
+        
+        // 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)
@@ -1058,11 +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/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/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

@@ -17,6 +17,11 @@ public class LauncherIpcClient : IDisposable
     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>
@@ -92,11 +97,28 @@ public class LauncherIpcClient : IDisposable
 
     /// <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()
     {
-        return !string.IsNullOrEmpty(
-            Environment.GetEnvironmentVariable(LauncherIpcConstants.LauncherPidEnvVar));
+        // 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()

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/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);
     }
 }
 

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/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

@@ -5,6 +5,7 @@ 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;
@@ -52,9 +53,9 @@ public sealed class UpdateWorkflowService
     private const string LauncherDirectoryName = ".launcher";
     private const string UpdateDirectoryName = "update";
     private const string IncomingDirectoryName = "incoming";
-    private const string DeltaManifestFileName = "files.json";
-    private const string DeltaSignatureFileName = "files.json.sig";
-    private const string DeltaArchiveFileName = "update.zip";
+    private const string SignedFileMapName = "files.json";
+    private const string SignedFileMapSignatureName = "files.json.sig";
+    private const string UpdateArchiveName = "update.zip";
 
     public UpdateWorkflowService(ISettingsFacadeService settingsFacade)
     {
@@ -81,7 +82,7 @@ public sealed class UpdateWorkflowService
     }
 
     /// <summary>
-    /// Checks whether a GitHub Release contains delta update assets (files.json, files.json.sig, update.zip).
+    /// Checks whether a GitHub Release contains signed file-map assets needed for incremental updates.
     /// </summary>
     public static bool IsDeltaUpdateAvailable(GitHubReleaseInfo release)
     {
@@ -90,15 +91,11 @@ public sealed class UpdateWorkflowService
             return false;
         }
 
-        var assetNames = release.Assets.Select(a => a.Name).ToHashSet(StringComparer.OrdinalIgnoreCase);
-        return assetNames.Contains(DeltaManifestFileName)
-            && assetNames.Contains(DeltaSignatureFileName)
-            && assetNames.Contains(DeltaArchiveFileName);
+        return TryResolveDeltaAssets(release.Assets, out _, out _, out _);
     }
 
     /// <summary>
-    /// Downloads the delta update package (files.json, files.json.sig, update.zip) from a GitHub Release
-    /// and places them in the Launcher's incoming directory for the Launcher to apply on next startup.
+    /// Downloads signed file-map assets to the Launcher's incoming directory.
     /// </summary>
     public async Task<UpdateDownloadResult> DownloadDeltaUpdateAsync(
         UpdateCheckResult checkResult,
@@ -112,9 +109,9 @@ public sealed class UpdateWorkflowService
             return new UpdateDownloadResult(false, null, "No update available for delta download.");
         }
 
-        if (!IsDeltaUpdateAvailable(checkResult.Release))
+        if (!TryResolveDeltaAssets(checkResult.Release.Assets, out var manifestAsset, out var signatureAsset, out var archiveAsset))
         {
-            return new UpdateDownloadResult(false, null, "Release does not contain delta update assets.");
+            return new UpdateDownloadResult(false, null, "Release does not contain compatible signed file-map assets.");
         }
 
         var incomingDir = GetLauncherIncomingDirectory();
@@ -132,32 +129,19 @@ public sealed class UpdateWorkflowService
         var downloadSource = state.UpdateDownloadSource;
         var downloadThreads = state.UpdateDownloadThreads;
 
-        var requiredAssets = new Dictionary<string, GitHubReleaseAsset>(StringComparer.OrdinalIgnoreCase)
+        var requiredAssets = new List<(GitHubReleaseAsset Asset, string DestinationFileName)>
         {
-            [DeltaManifestFileName] = null!,
-            [DeltaSignatureFileName] = null!,
-            [DeltaArchiveFileName] = null!
+            (manifestAsset, SignedFileMapName),
+            (signatureAsset, SignedFileMapSignatureName),
+            (archiveAsset, UpdateArchiveName)
         };
 
-        foreach (var asset in checkResult.Release.Assets)
-        {
-            if (requiredAssets.ContainsKey(asset.Name))
-            {
-                requiredAssets[asset.Name] = asset;
-            }
-        }
-
-        if (requiredAssets.Any(kvp => kvp.Value is null))
-        {
-            return new UpdateDownloadResult(false, null, "One or more delta assets not found in release.");
-        }
-
         var totalAssets = requiredAssets.Count;
         var completedAssets = 0;
 
-        foreach (var (name, asset) in requiredAssets)
+        foreach (var (asset, destinationFileName) in requiredAssets)
         {
-            var destinationPath = Path.Combine(incomingDir, name);
+            var destinationPath = Path.Combine(incomingDir, destinationFileName);
 
             // Skip if already downloaded and file exists
             if (File.Exists(destinationPath))
@@ -165,7 +149,7 @@ public sealed class UpdateWorkflowService
                 var existingHash = await GitHubReleaseUpdateService.ComputeFileSha256Async(destinationPath, cancellationToken);
                 if (asset.Sha256 is not null && string.Equals(existingHash, asset.Sha256, StringComparison.OrdinalIgnoreCase))
                 {
-                    AppLogger.Info("UpdateWorkflow", $"Delta asset {name} already downloaded with matching hash, skipping.");
+                    AppLogger.Info("UpdateWorkflow", $"Update asset {asset.Name} already downloaded with matching hash, skipping.");
                     completedAssets++;
                     progress?.Report((double)completedAssets / totalAssets);
                     continue;
@@ -189,21 +173,21 @@ public sealed class UpdateWorkflowService
             if (!result.Success)
             {
                 // Clean up partially downloaded files
-                foreach (var file in requiredAssets.Keys)
+                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 delta asset {name}: {result.ErrorMessage}");
+                return new UpdateDownloadResult(false, null, $"Failed to download update asset {asset.Name}: {result.ErrorMessage}");
             }
 
             completedAssets++;
             progress?.Report((double)completedAssets / totalAssets);
         }
 
-        // Save state indicating a delta update is pending
+        // Save state indicating a signed file-map update is pending.
         SaveState(state with
         {
-            PendingUpdateInstallerPath = Path.Combine(incomingDir, DeltaManifestFileName),
+            PendingUpdateInstallerPath = Path.Combine(incomingDir, SignedFileMapName),
             PendingUpdateVersion = checkResult.LatestVersionText,
             PendingUpdatePublishedAtUtcMs = checkResult.Release.PublishedAt == DateTimeOffset.MinValue
                 ? null
@@ -212,13 +196,13 @@ public sealed class UpdateWorkflowService
             PendingUpdateSha256 = null
         });
 
-        AppLogger.Info("UpdateWorkflow", $"Delta update package downloaded to {incomingDir}. Will be applied by Launcher on next startup.");
+        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, DeltaManifestFileName), null);
+        return new UpdateDownloadResult(true, Path.Combine(incomingDir, SignedFileMapName), null);
     }
 
     /// <summary>
-    /// Checks whether the pending update is a delta update (files.json in incoming dir) vs a full installer.
+    /// Checks whether the pending update is managed by Launcher incoming payload.
     /// </summary>
     public bool IsPendingDeltaUpdate()
     {
@@ -229,11 +213,71 @@ public sealed class UpdateWorkflowService
             return false;
         }
 
-        // Delta updates are identified by the manifest file path
-        return pendingPath.EndsWith(DeltaManifestFileName, StringComparison.OrdinalIgnoreCase)
+        // 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();

LanMountainDesktop/ViewModels/SettingsViewModels.cs

@@ -1496,7 +1496,7 @@ public sealed partial class UpdateSettingsPageViewModel : ViewModelBase
     private string _selectedUpdateChannelValue = UpdateSettingsValues.ChannelStable;
 
     [ObservableProperty]
-    private string _selectedUpdateSourceValue = UpdateSettingsValues.DownloadSourceGitHub;
+    private string _selectedUpdateSourceValue = UpdateSettingsValues.DownloadSourcePdc;
 
     [ObservableProperty]
     private string _selectedUpdateModeValue = UpdateSettingsValues.ModeDownloadThenConfirm;
@@ -1630,6 +1630,9 @@ public sealed partial class UpdateSettingsPageViewModel : ViewModelBase
     [ObservableProperty]
     private string _previewChannelText = string.Empty;
 
+    [ObservableProperty]
+    private string _pdcSourceText = string.Empty;
+
     [ObservableProperty]
     private string _gitHubSourceText = string.Empty;
 
@@ -1666,6 +1669,9 @@ public sealed partial class UpdateSettingsPageViewModel : ViewModelBase
     public bool IsPreviewChannelSelected =>
         string.Equals(SelectedUpdateChannelValue, UpdateSettingsValues.ChannelPreview, StringComparison.OrdinalIgnoreCase);
 
+    public bool IsPdcSourceSelected =>
+        string.Equals(SelectedUpdateSourceValue, UpdateSettingsValues.DownloadSourcePdc, StringComparison.OrdinalIgnoreCase);
+
     public bool IsGitHubSourceSelected =>
         string.Equals(SelectedUpdateSourceValue, UpdateSettingsValues.DownloadSourceGitHub, StringComparison.OrdinalIgnoreCase);
 
@@ -1858,6 +1864,12 @@ public sealed partial class UpdateSettingsPageViewModel : ViewModelBase
         SelectedUpdateChannelValue = UpdateSettingsValues.ChannelPreview;
     }
 
+    [RelayCommand]
+    private void SelectPdcSource()
+    {
+        SelectedUpdateSourceValue = UpdateSettingsValues.DownloadSourcePdc;
+    }
+
     [RelayCommand]
     private void SelectGitHubSource()
     {
@@ -1929,8 +1941,8 @@ public sealed partial class UpdateSettingsPageViewModel : ViewModelBase
             DownloadProgressValue = 0;
             DownloadProgressText = L("settings.update.download_progress_idle", "Download progress: -");
             UpdateStatus = isForce
-                ? L("settings.update.status_force_checking", "Force checking GitHub releases...")
-                : L("settings.update.status_checking", "Checking GitHub releases...");
+                ? L("settings.update.status_force_checking", "Force checking update source...")
+                : L("settings.update.status_checking", "Checking update source...");
 
             var result = await _updateWorkflowService.CheckForUpdatesAsync(_currentVersion, isForce);
             _lastCheckResult = result.Success ? result : null;
@@ -2100,7 +2112,7 @@ public sealed partial class UpdateSettingsPageViewModel : ViewModelBase
         DownloadThreadsLabel = L("settings.update.download_threads_label", "Download Threads");
         DownloadThreadsDescription = L("settings.update.download_threads_desc", "Choose how many parallel download threads are used for application updates.");
         ForceCheckUpdateLabel = L("settings.update.force_check_label", "Force Check Update");
-        ForceCheckUpdateDescription = L("settings.update.force_check_desc", "Force check for updates from GitHub, ignoring version comparison.");
+        ForceCheckUpdateDescription = L("settings.update.force_check_desc", "Force check for updates, ignoring version comparison.");
         CheckForUpdatesButtonText = L("settings.update.check_button", "Check for Updates");
         DownloadButtonText = L("settings.update.download_install_button", "Download & Install");
         InstallNowButtonText = L("settings.update.install_now_button", "Install Now");
@@ -2112,6 +2124,7 @@ public sealed partial class UpdateSettingsPageViewModel : ViewModelBase
         UpdateTypeLabel = L("settings.update.type_label", "Update Type");
         StableChannelText = L("settings.update.channel_stable", "Stable");
         PreviewChannelText = L("settings.update.channel_preview", "Preview");
+        PdcSourceText = L("settings.update.source_pdc", "PDC");
         GitHubSourceText = L("settings.update.source_github", "GitHub");
         GhProxySourceText = L("settings.update.source_ghproxy", "gh-proxy");
         ManualModeText = L("settings.update.mode_manual", "Manual Update");
@@ -2309,6 +2322,9 @@ public sealed partial class UpdateSettingsPageViewModel : ViewModelBase
     {
         return UpdateSettingsValues.NormalizeDownloadSource(value) switch
         {
+            UpdateSettingsValues.DownloadSourcePdc => L(
+                "settings.update.source_pdc_desc",
+                "Prefer PDC metadata and distribution endpoints, then automatically fallback to GitHub."),
             UpdateSettingsValues.DownloadSourceGhProxy => L(
                 "settings.update.source_ghproxy_desc",
                 "Use the gh-proxy mirror when downloading GitHub release assets."),
@@ -2360,6 +2376,7 @@ public sealed partial class UpdateSettingsPageViewModel : ViewModelBase
     {
         return
         [
+            new SelectionOption(UpdateSettingsValues.DownloadSourcePdc, PdcSourceText),
             new SelectionOption(UpdateSettingsValues.DownloadSourceGitHub, GitHubSourceText),
             new SelectionOption(UpdateSettingsValues.DownloadSourceGhProxy, GhProxySourceText)
         ];

LanMountainDesktop/Views/DesktopWidgetWindow.axaml.cs

@@ -25,6 +25,23 @@ public partial class DesktopWidgetWindow : Window
         ComponentContainer.Child = componentContent;
     }
 
+    public void UpdateComponentLayout(double width, double height)
+    {
+        ComponentContainer.Width = width;
+        ComponentContainer.Height = height;
+
+        if (ComponentContainer.Child is Control child)
+        {
+            child.Width = width;
+            child.Height = height;
+        }
+
+        if (OperatingSystem.IsWindows() && IsVisible)
+        {
+            Dispatcher.UIThread.Post(UpdateInteractiveRegion, DispatcherPriority.Render);
+        }
+    }
+
     protected override void OnOpened(EventArgs e)
     {
         base.OnOpened(e);

LanMountainDesktop/Views/TransparentOverlayWindow.axaml.cs

@@ -23,6 +23,8 @@ namespace LanMountainDesktop.Views;
 public partial class TransparentOverlayWindow : Window
 {
     private readonly IFusedDesktopLayoutService _layoutService = FusedDesktopLayoutServiceProvider.GetOrCreate();
+    private readonly IWindowBottomMostService _bottomMostService = WindowBottomMostServiceFactory.GetOrCreate();
+    private readonly IRegionPassthroughService _regionPassthroughService = RegionPassthroughServiceFactory.GetOrCreate();
     
     // 滑动状态
     private bool _isSwipeActive;
@@ -77,6 +79,11 @@ public partial class TransparentOverlayWindow : Window
         _weatherDataService = facade.Weather.GetWeatherInfoService();
         _timeZoneService = facade.Region.GetTimeZoneService();
         _settingsFacade = facade;
+
+        if (OperatingSystem.IsWindows())
+        {
+            _bottomMostService.SetupBottomMost(this);
+        }
     }
     
     private readonly ISettingsFacadeService _settingsFacade;
@@ -84,6 +91,7 @@ public partial class TransparentOverlayWindow : Window
     public void SaveLayoutAndHide()
     {
         SaveLayout();
+        _regionPassthroughService.ClearInteractiveRegions(this);
         Hide();
         
         // Remove all components so that next time we open it builds fresh from snapshot
@@ -131,6 +139,11 @@ public partial class TransparentOverlayWindow : Window
         RenderAllComponents();
         
         AppLogger.Info("TransparentOverlay", $"Opened with {_layout.ComponentPlacements.Count} components.");
+
+        if (OperatingSystem.IsWindows())
+        {
+            _bottomMostService.SendToBottom(this);
+        }
     }
     
     /// <summary>
@@ -185,7 +198,25 @@ public partial class TransparentOverlayWindow : Window
     /// </summary>
     private void UpdateInteractiveRegions()
     {
-        // 编辑模式下不再需要底层穿透功能计算，这里留空或移除
+        _interactiveRegions.Clear();
+
+        foreach (var host in _componentHosts.Values)
+        {
+            var left = Canvas.GetLeft(host);
+            var top = Canvas.GetTop(host);
+            var width = host.Width > 0 ? host.Width : host.Bounds.Width;
+            var height = host.Height > 0 ? host.Height : host.Bounds.Height;
+
+            if (width <= 0 || height <= 0)
+            {
+                continue;
+            }
+
+            // 稍微向外扩一圈，确保拖拽和右下角缩放手柄也能命中。
+            _interactiveRegions.Add(new Rect(left - 12, top - 12, width + 24, height + 24));
+        }
+
+        _regionPassthroughService.SetInteractiveRegions(this, _interactiveRegions);
     }
     
     /// <summary>

LanMountainDesktop/app.manifest

@@ -5,13 +5,18 @@
        For more details visit https://learn.microsoft.com/en-us/windows/win32/sbscs/application-manifests -->
   <assemblyIdentity version="1.0.0.0" name="LanMountainDesktop.Desktop"/>
 
+  <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，以调用者权限运行 -->
+        <requestedExecutionLevel level="asInvoker" uiAccess="false" />
+      </requestedPrivileges>
+    </security>
+  </trustInfo>
+
   <compatibility xmlns="urn:schemas-microsoft-com:compatibility.v1">
     <application>
-      <!-- A list of the Windows versions that this application has been tested on
-           and is designed to work with. Uncomment the appropriate elements
-           and Windows will automatically select the most compatible environment. -->
-
-      <!-- Windows 10 -->
+      <!-- Windows 10/11 -->
       <supportedOS Id="{8e0f7a12-bfb3-4fe8-b9a5-48fd50a15a9a}" />
     </application>
   </compatibility>

docs/ARCHITECTURE.md

@@ -194,3 +194,9 @@ This repository is organized around a desktop host app plus a host-side plugin e
 **Launcher Architecture**: `LanMountainDesktop.Launcher/` serves as the single entry point, managing OOBE, splash screen, multi-version deployment, incremental updates, and plugin installation. It uses a version directory structure (`app-{version}/`) with marker files (`.current`, `.partial`, `.destroy`) to enable atomic updates and rollback capabilities. See the Chinese section above for detailed architecture documentation.
 
 The runtime flow starts with the Launcher selecting the best version, then proceeds into `Program.cs`, into `App.axaml.cs`, initializes settings/theme/localization services, then boots the desktop shell, tray, windows, and plugin runtime. The most important behavior boundaries are component registration, plugin activation, appearance resources, and settings persistence.
+
+## VeloPack Integration Note
+
+- Incremental package build/publish has moved to VeloPack native assets (
+eleases.win.json + *.nupkg).
+- Launcher runtime responsibilities are unchanged: OOBE, startup orchestration, update apply, and rollback.

docs/DEVELOPMENT.md

@@ -166,3 +166,10 @@ Use `LanMountainDesktop.slnx` as the workspace entry point. The standard loop is
 For packaging, see `LanMountainDesktop/PACKAGING.md`. For plugin package generation or local feed workflows, use `scripts/Pack-PluginPackages.ps1`.
 
 **Launcher Architecture**: LanMountainDesktop uses a Launcher as the single entry point, responsible for version management, updates, and launching the main application. See the Chinese section above for detailed architecture documentation.
+
+## VeloPack Release Assets
+
+- Windows incremental release packaging now uses VeloPack native outputs (
+eleases.win.json, *.nupkg).
+- Launcher still performs update apply/rollback; VeloPack is used for package generation.
+- Legacy delta script flow is retained behind a disabled fallback switch in CI.

docs/UPDATE_SYSTEM.md

@@ -442,3 +442,10 @@ private static void EnsurePathWithinRoot(string targetPath, string rootPath)
 - [Launcher 架构文档](LAUNCHER.md)
 - [构建和部署指南](BUILD_AND_DEPLOY.md)
 - [故障排除指南](TROUBLESHOOTING.md)
+
+## VeloPack Packaging (Current)
+
+- Release pipeline now produces VeloPack native assets (
+eleases.win.json, *.nupkg, RELEASES).
+- Launcher remains the installer and rollback authority; only package generation moved to VeloPack.
+- Legacy iles.json + update.zip generation remains available only as a disabled fallback path in CI.

phainon.yml

@@ -0,0 +1,29 @@
+# Phainon Distribution Center (PDC) publish configuration
+# This file is intentionally conservative: Launcher remains installer/rollback authority.
+name: "LanMountainDesktop"
+
+components:
+  app:
+    allowDiffUpdate: true
+    root: "app-$(version)/"
+    includes:
+      - "**"
+  launcher:
+    root: ""
+    includes:
+      - "**"
+    excludes:
+      - "app-*/**"
+      - ".launcher/update/incoming/**"
+      - "files.json"
+      - "files.json.sig"
+      - "update.zip"
+
+variables:
+  number: 0
+
+# Replace these roots in CI/CD or environment-specific templates when enabling PDCC publish.
+fileRepoRoot: "https://example.invalid/lanmountain/distribution-v1/repo/"
+archiveRoot: "https://example.invalid/lanmountain/distribution-v1/$(primaryVersion)/$(version)/"
+bucketKeyRoot: "lanmountain/distribution-v1/repo/"
+archiveBucketKeyRoot: "lanmountain/distribution-v1/$(primaryVersion)/$(version)/"

scripts/Generate-DeltaPackage.ps1

@@ -1,95 +1,165 @@
-# Generate-DeltaPackage.ps1
-# 生成增量更新包 (delta.zip + files.json)
-
 param(
-    [Parameter(Mandatory=$true)]
+    [Parameter(Mandatory = $true)]
     [string]$PreviousVersion,
-    
-    [Parameter(Mandatory=$true)]
+
+    [Parameter(Mandatory = $true)]
     [string]$CurrentVersion,
-    
-    [Parameter(Mandatory=$true)]
+
+    [Parameter(Mandatory = $true)]
     [string]$PreviousDir,
-    
-    [Parameter(Mandatory=$true)]
+
+    [Parameter(Mandatory = $true)]
     [string]$CurrentDir,
-    
-    [Parameter(Mandatory=$true)]
+
+    [Parameter(Mandatory = $true)]
     [string]$OutputDir
 )
 
 $ErrorActionPreference = "Stop"
 
-Write-Host "=== 生成增量更新包 ===" -ForegroundColor Cyan
-Write-Host "从版本: $PreviousVersion"
-Write-Host "到版本: $CurrentVersion"
-Write-Host "上一版本目录: $PreviousDir"
-Write-Host "当前版本目录: $CurrentDir"
-Write-Host "输出目录: $OutputDir"
-Write-Host ""
+Add-Type -AssemblyName System.IO.Compression
+Add-Type -AssemblyName System.IO.Compression.FileSystem
 
-# 确保输出目录存在
-New-Item -ItemType Directory -Force -Path $OutputDir | Out-Null
+function Get-NormalizedRelativePath {
+    param(
+        [Parameter(Mandatory = $true)]
+        [string]$RootDir,
 
-# 计算文件 SHA256
-function Get-FileSha256 {
-    param([string]$Path)
-    $hash = Get-FileHash -Path $Path -Algorithm SHA256
-    return $hash.Hash.ToLower()
+        [Parameter(Mandatory = $true)]
+        [string]$FullPath
+    )
+
+    $separator = [System.IO.Path]::DirectorySeparatorChar
+    $altSeparator = [System.IO.Path]::AltDirectorySeparatorChar
+
+    $root = [System.IO.Path]::GetFullPath($RootDir).Replace($altSeparator, $separator).TrimEnd($separator)
+    $path = [System.IO.Path]::GetFullPath($FullPath).Replace($altSeparator, $separator)
+
+    $comparison = if ($separator -eq '\') {
+        [System.StringComparison]::OrdinalIgnoreCase
+    }
+    else {
+        [System.StringComparison]::Ordinal
+    }
+
+    $rootWithSeparator = "$root$separator"
+    if ($path.StartsWith($rootWithSeparator, $comparison)) {
+        $relative = $path.Substring($rootWithSeparator.Length)
+    }
+    elseif ($path.Equals($root, $comparison)) {
+        $relative = ""
+    }
+    else {
+        throw "File path '$path' is not under root '$root'."
+    }
+
+    return $relative.Replace('\', '/')
+}
+
+function Get-FileSha256Hex {
+    param(
+        [Parameter(Mandatory = $true)]
+        [string]$Path
+    )
+
+    return (Get-FileHash -LiteralPath $Path -Algorithm SHA256).Hash.ToLowerInvariant()
 }
 
-# 获取目录中所有文件的相对路径和哈希
 function Get-FileManifest {
-    param([string]$RootDir)
-    
+    param(
+        [Parameter(Mandatory = $true)]
+        [string]$RootDir
+    )
+
+    if (-not (Test-Path -LiteralPath $RootDir)) {
+        throw "Directory does not exist: $RootDir"
+    }
+
+    $resolvedRoot = (Resolve-Path -LiteralPath $RootDir).Path
     $manifest = @{}
-    $files = Get-ChildItem -Path $RootDir -Recurse -File
-    
+    $files = Get-ChildItem -LiteralPath $resolvedRoot -Recurse -File
+
     foreach ($file in $files) {
-        $relativePath = $file.FullName.Substring($RootDir.Length).TrimStart('\', '/')
-        $relativePath = $relativePath.Replace('\', '/')
-        
-        $manifest[$relativePath] = @{
+        $relativePath = Get-NormalizedRelativePath -RootDir $resolvedRoot -FullPath $file.FullName
+        $manifest[$relativePath] = [ordered]@{
             Path = $relativePath
-            Sha256 = Get-FileSha256 -Path $file.FullName
-            Size = $file.Length
+            Sha256 = Get-FileSha256Hex -Path $file.FullName
+            Size = [long]$file.Length
         }
     }
-    
+
     return $manifest
 }
 
-Write-Host "扫描上一版本文件..." -ForegroundColor Yellow
-$previousManifest = Get-FileManifest -RootDir $PreviousDir
+function New-DeltaArchive {
+    param(
+        [Parameter(Mandatory = $true)]
+        [string]$ZipPath,
 
-Write-Host "扫描当前版本文件..." -ForegroundColor Yellow
+        [Parameter(Mandatory = $true)]
+        [string]$CurrentRoot,
+
+        [Parameter(Mandatory = $false)]
+        [AllowEmptyCollection()]
+        [object[]]$ChangedFiles = @()
+    )
+
+    if (Test-Path -LiteralPath $ZipPath) {
+        Remove-Item -LiteralPath $ZipPath -Force
+    }
+
+    $zip = [System.IO.Compression.ZipFile]::Open($ZipPath, [System.IO.Compression.ZipArchiveMode]::Create)
+    try {
+        foreach ($file in $ChangedFiles) {
+            $sourcePath = Join-Path $CurrentRoot $file.Path
+            if (-not (Test-Path -LiteralPath $sourcePath)) {
+                throw "Changed file was not found while building archive: $sourcePath"
+            }
+
+            [System.IO.Compression.ZipFileExtensions]::CreateEntryFromFile(
+                $zip,
+                $sourcePath,
+                $file.Path,
+                [System.IO.Compression.CompressionLevel]::Optimal
+            ) | Out-Null
+        }
+    }
+    finally {
+        $zip.Dispose()
+    }
+}
+
+Write-Host "Generating incremental package..."
+Write-Host "From: $PreviousVersion"
+Write-Host "To:   $CurrentVersion"
+Write-Host "Prev: $PreviousDir"
+Write-Host "Curr: $CurrentDir"
+Write-Host "Out:  $OutputDir"
+
+New-Item -ItemType Directory -Path $OutputDir -Force | Out-Null
+
+$previousManifest = Get-FileManifest -RootDir $PreviousDir
 $currentManifest = Get-FileManifest -RootDir $CurrentDir
 
-# 分析文件变更
 $changedFiles = @()
 $reusedFiles = @()
 $deletedFiles = @()
 
-Write-Host "分析文件变更..." -ForegroundColor Yellow
-
-# 检查新增和修改的文件
-foreach ($path in $currentManifest.Keys) {
+foreach ($path in ($currentManifest.Keys | Sort-Object)) {
     $currentFile = $currentManifest[$path]
-    
+
     if ($previousManifest.ContainsKey($path)) {
         $previousFile = $previousManifest[$path]
-        
         if ($currentFile.Sha256 -eq $previousFile.Sha256) {
-            # 文件未变更,可以复用
-            $reusedFiles += @{
+            $reusedFiles += [ordered]@{
                 Path = $path
                 Action = "reuse"
                 Sha256 = $currentFile.Sha256
                 Size = $currentFile.Size
             }
-        } else {
-            # 文件已修改
-            $changedFiles += @{
+        }
+        else {
+            $changedFiles += [ordered]@{
                 Path = $path
                 Action = "replace"
                 Sha256 = $currentFile.Sha256
@@ -97,9 +167,9 @@ foreach ($path in $currentManifest.Keys) {
                 ArchivePath = $path
             }
         }
-    } else {
-        # 新增文件
-        $changedFiles += @{
+    }
+    else {
+        $changedFiles += [ordered]@{
             Path = $path
             Action = "add"
             Sha256 = $currentFile.Sha256
@@ -109,76 +179,51 @@ foreach ($path in $currentManifest.Keys) {
     }
 }
 
-# 检查删除的文件
-foreach ($path in $previousManifest.Keys) {
+foreach ($path in ($previousManifest.Keys | Sort-Object)) {
     if (-not $currentManifest.ContainsKey($path)) {
-        $deletedFiles += @{
+        $deletedFiles += [ordered]@{
             Path = $path
             Action = "delete"
         }
     }
 }
 
-Write-Host "变更统计:" -ForegroundColor Green
-Write-Host "  新增/修改: $($changedFiles.Count) 个文件"
-Write-Host "  复用: $($reusedFiles.Count) 个文件"
-Write-Host "  删除: $($deletedFiles.Count) 个文件"
-Write-Host ""
+Write-Host "Changed: $($changedFiles.Count)"
+Write-Host "Reused:  $($reusedFiles.Count)"
+Write-Host "Deleted: $($deletedFiles.Count)"
 
-# 创建临时目录用于打包
-$tempDir = Join-Path $OutputDir "temp_delta"
-if (Test-Path $tempDir) {
-    Remove-Item -Path $tempDir -Recurse -Force
-}
-New-Item -ItemType Directory -Force -Path $tempDir | Out-Null
+$resolvedCurrentDir = (Resolve-Path -LiteralPath $CurrentDir).Path
+$updateZipPath = Join-Path $OutputDir "update.zip"
+New-DeltaArchive -ZipPath $updateZipPath -CurrentRoot $resolvedCurrentDir -ChangedFiles $changedFiles
 
-# 复制变更的文件到临时目录
-Write-Host "复制变更文件..." -ForegroundColor Yellow
-foreach ($file in $changedFiles) {
-    $sourcePath = Join-Path $CurrentDir $file.Path
-    $destPath = Join-Path $tempDir $file.Path
-    $destDir = Split-Path -Parent $destPath
-    
-    if (-not (Test-Path $destDir)) {
-        New-Item -ItemType Directory -Force -Path $destDir | Out-Null
-    }
-    
-    Copy-Item -Path $sourcePath -Destination $destPath -Force
-}
+$deltaZipPath = Join-Path $OutputDir ("delta-{0}-to-{1}.zip" -f $PreviousVersion, $CurrentVersion)
+Copy-Item -LiteralPath $updateZipPath -Destination $deltaZipPath -Force
 
-# 创建 delta.zip
-$deltaZipPath = Join-Path $OutputDir "delta-$PreviousVersion-to-$CurrentVersion.zip"
-Write-Host "创建增量包: $deltaZipPath" -ForegroundColor Yellow
-
-if (Test-Path $deltaZipPath) {
-    Remove-Item -Path $deltaZipPath -Force
-}
-
-Compress-Archive -Path "$tempDir\*" -DestinationPath $deltaZipPath -CompressionLevel Optimal
-
-# 清理临时目录
-Remove-Item -Path $tempDir -Recurse -Force
-
-# 生成 files.json
-$filesJson = @{
+$allEntries = @($changedFiles + $reusedFiles + $deletedFiles)
+$filesJson = [ordered]@{
     FromVersion = $PreviousVersion
     ToVersion = $CurrentVersion
-    GeneratedAt = (Get-Date).ToUniversalTime().ToString("o")
-    Files = @($changedFiles + $reusedFiles + $deletedFiles)
+    GeneratedAt = [DateTimeOffset]::UtcNow.ToString("o")
+    Files = $allEntries
 }
 
-$filesJsonPath = Join-Path $OutputDir "files-$CurrentVersion.json"
-Write-Host "生成文件清单: $filesJsonPath" -ForegroundColor Yellow
+$jsonText = $filesJson | ConvertTo-Json -Depth 10
+$utf8NoBom = New-Object System.Text.UTF8Encoding($false)
 
-$filesJson | ConvertTo-Json -Depth 10 | Set-Content -Path $filesJsonPath -Encoding UTF8
+$filesJsonPath = Join-Path $OutputDir "files.json"
+[System.IO.File]::WriteAllText($filesJsonPath, $jsonText, $utf8NoBom)
 
-# 计算增量包大小
-$deltaSize = (Get-Item $deltaZipPath).Length
-$deltaSizeMB = [math]::Round($deltaSize / 1MB, 2)
+$versionedFilesJsonPath = Join-Path $OutputDir ("files-{0}.json" -f $CurrentVersion)
+Copy-Item -LiteralPath $filesJsonPath -Destination $versionedFilesJsonPath -Force
+
+$updateSizeBytes = (Get-Item -LiteralPath $updateZipPath).Length
+$updateSizeMb = [Math]::Round($updateSizeBytes / 1MB, 2)
 
 Write-Host ""
-Write-Host "=== 完成 ===" -ForegroundColor Green
-Write-Host "增量包大小: $deltaSizeMB MB"
-Write-Host "输出文件:"
-Write-Host "  - $deltaZipPath"
-Write-Host "  - $filesJsonPath"
+Write-Host "Done."
+Write-Host "update.zip size: $updateSizeMb MB"
+Write-Host "Generated:"
+Write-Host "  $updateZipPath"
+Write-Host "  $filesJsonPath"
+Write-Host "  $deltaZipPath"
+Write-Host "  $versionedFilesJsonPath"

scripts/Sign-FileMap.ps1

@@ -1,65 +1,56 @@
-# Sign-FileMap.ps1
-# 对 files.json 进行 RSA 签名
-
 param(
-    [Parameter(Mandatory=$true)]
+    [Parameter(Mandatory = $true)]
     [string]$FilesJsonPath,
-    
-    [Parameter(Mandatory=$true)]
+
+    [Parameter(Mandatory = $true)]
     [string]$PrivateKeyPath,
-    
-    [Parameter(Mandatory=$false)]
+
+    [Parameter(Mandatory = $false)]
     [string]$OutputPath
 )
 
 $ErrorActionPreference = "Stop"
 
-Write-Host "=== 签名文件清单 ===" -ForegroundColor Cyan
-Write-Host "文件清单: $FilesJsonPath"
-Write-Host "私钥: $PrivateKeyPath"
-Write-Host ""
-
-# 检查文件是否存在
-if (-not (Test-Path $FilesJsonPath)) {
-    Write-Error "文件清单不存在: $FilesJsonPath"
-    exit 1
+if ($PSVersionTable.PSVersion.Major -lt 7) {
+    throw "Sign-FileMap.ps1 requires PowerShell 7 or newer."
 }
 
-if (-not (Test-Path $PrivateKeyPath)) {
-    Write-Error "私钥文件不存在: $PrivateKeyPath"
-    exit 1
+if (-not (Test-Path -LiteralPath $FilesJsonPath)) {
+    throw "Manifest file not found: $FilesJsonPath"
+}
+
+if (-not (Test-Path -LiteralPath $PrivateKeyPath)) {
+    throw "Private key file not found: $PrivateKeyPath"
 }
 
-# 确定输出路径
 if ([string]::IsNullOrWhiteSpace($OutputPath)) {
     $OutputPath = "$FilesJsonPath.sig"
 }
 
-# 读取文件内容
-$jsonBytes = [System.IO.File]::ReadAllBytes($FilesJsonPath)
+$resolvedManifestPath = (Resolve-Path -LiteralPath $FilesJsonPath).Path
+$manifestBytes = [System.IO.File]::ReadAllBytes($resolvedManifestPath)
 
-# 读取私钥
-$privateKeyPem = Get-Content -Path $PrivateKeyPath -Raw
-
-# 使用 .NET 进行 RSA 签名
-Add-Type -AssemblyName System.Security.Cryptography
+$privateKeyPem = Get-Content -LiteralPath $PrivateKeyPath -Raw
+if ([string]::IsNullOrWhiteSpace($privateKeyPem)) {
+    throw "Private key PEM is empty: $PrivateKeyPath"
+}
 
 $rsa = [System.Security.Cryptography.RSA]::Create()
-$rsa.ImportFromPem($privateKeyPem)
+try {
+    $rsa.ImportFromPem($privateKeyPem)
+    $signatureBytes = $rsa.SignData(
+        $manifestBytes,
+        [System.Security.Cryptography.HashAlgorithmName]::SHA256,
+        [System.Security.Cryptography.RSASignaturePadding]::Pkcs1
+    )
+}
+finally {
+    $rsa.Dispose()
+}
 
-# 生成签名
-$signature = $rsa.SignData(
-    $jsonBytes,
-    [System.Security.Cryptography.HashAlgorithmName]::SHA256,
-    [System.Security.Cryptography.RSASignaturePadding]::Pkcs1
-)
+$signatureBase64 = [Convert]::ToBase64String($signatureBytes)
+[System.IO.File]::WriteAllText($OutputPath, $signatureBase64, [System.Text.Encoding]::ASCII)
 
-# 转换为 Base64
-$signatureBase64 = [Convert]::ToBase64String($signature)
-
-# 写入签名文件
-Set-Content -Path $OutputPath -Value $signatureBase64 -Encoding ASCII
-
-Write-Host "=== 完成 ===" -ForegroundColor Green
-Write-Host "签名文件: $OutputPath"
-Write-Host "签名长度: $($signature.Length) 字节"
+Write-Host "Signed manifest file."
+Write-Host "Manifest:  $FilesJsonPath"
+Write-Host "Signature: $OutputPath"