fix: compare signing keys by SPKI instead of PEM text

.github/workflows/build.yml

@@ -67,9 +67,14 @@ jobs:
             libx11-6 libxrandr2 libxinerama1 \
             libxi6 libxcursor1 libxext6 \
             libxrender1 libxkbcommon-x11-0 \
-            clang zlib1g-dev \
-            libportaudio2 libasound2 \
-            libwebkit2gtk-4.1-dev
+            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

.github/workflows/code-quality.yml

@@ -25,7 +25,7 @@ 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

.github/workflows/release.yml

@@ -109,7 +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 `
@@ -127,7 +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) {
@@ -135,7 +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"
@@ -317,176 +317,92 @@ jobs:
           Write-Host "Installer size: $([Math]::Round($installerFile.Length / 1MB, 2)) MB"
         shell: pwsh
 
-      - name: Create App 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 }}"
           $arch = "${{ 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
-
-          # 创建 app-{version}-win-{arch}.zip 供后续版本作为旧版本对比
-          $appZipPath = Join-Path $outputDir "app-$version-win-$arch.zip"
-          Write-Host "Creating app-$version-win-$arch.zip..."
-          Compress-Archive -Path "$currentAppPath\*" -DestinationPath $appZipPath -CompressionLevel Optimal
-
-          $sizeMB = [Math]::Round((Get-Item $appZipPath).Length / 1MB, 2)
-          Write-Host "Created app-$version-win-$arch.zip: $sizeMB MB"
-        shell: pwsh
-
-      - name: Generate Delta Package
-        if: matrix.self_contained == true && matrix.arch == 'x64'
-        run: |
-          $version = "${{ needs.prepare.outputs.version }}"
-          $arch = "${{ matrix.arch }}"
-          $publishDir = "publish/windows-$arch"
-          $appDir = "app-$version"
-          $currentAppPath = Join-Path $publishDir $appDir
-          $outputDir = "delta-output"
-          $scriptPath = "scripts/Generate-DeltaPackage.ps1"
-
-          New-Item -ItemType Directory -Path $outputDir -Force | Out-Null
-
-          # --- Determine previous version and download its app package 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"
-
-              # 下载旧版本的 app-{version}-win-{arch}.zip
-              $prevAppZip = $previousRelease.assets | Where-Object { $_.name -eq "app-$previousVersion-win-$arch.zip" } | Select-Object -First 1
-              if ($prevAppZip) {
-                Write-Host "Found app-$previousVersion-win-$arch.zip in previous release - downloading for diff..."
-                $prevAppZipDest = Join-Path $outputDir "prev-app.zip"
-                Invoke-WebRequest -Uri $prevAppZip.browser_download_url -OutFile $prevAppZipDest -Headers $headers
-
-                # 解压 app-{version}.zip
-                $previousAppPath = Join-Path $outputDir "prev-app"
-                New-Item -ItemType Directory -Path $previousAppPath -Force | Out-Null
-                Expand-Archive -Path $prevAppZipDest -DestinationPath $previousAppPath -Force
-                Remove-Item -Path $prevAppZipDest -Force -ErrorAction SilentlyContinue
-
-                if ($previousAppPath -and (Test-Path $previousAppPath)) {
-                  $prevFileCount = (Get-ChildItem -Path $previousAppPath -Recurse -File).Count
-                  Write-Host "Extracted $prevFileCount files from previous version for diff"
-                }
-              } else {
-                Write-Host "No app-$previousVersion-win-$arch.zip found in previous release - will generate full package"
-                Write-Host "This is expected for the first release after this fix."
-              }
-            }
-          } catch {
-            Write-Host "Could not fetch previous release: $_"
-          }
-
-          # --- Generate delta package using the script ---
-          if ($previousAppPath -and (Test-Path $previousAppPath) -and $previousVersion) {
-            Write-Host "Generating delta package from $previousVersion to $version..."
-            & $scriptPath `
-              -PreviousVersion $previousVersion `
-              -CurrentVersion $version `
-              -PreviousDir $previousAppPath `
-              -CurrentDir $currentAppPath `
-              -OutputDir $outputDir
-
-            if ($LASTEXITCODE -ne 0) {
-              Write-Error "Generate-DeltaPackage.ps1 failed"
-              exit 1
-            }
-          } else {
-            Write-Host "No previous version available - generating full package..."
-            # Generate a "full" delta package (all files as "add")
-            & $scriptPath `
-              -PreviousVersion "0.0.0" `
-              -CurrentVersion $version `
-              -PreviousDir $currentAppPath `
-              -CurrentDir $currentAppPath `
-              -OutputDir $outputDir
-
-            if ($LASTEXITCODE -ne 0) {
-              Write-Error "Generate-DeltaPackage.ps1 failed"
-              exit 1
-            }
-          }
-
-          # Clean up previous version extraction
-          if ($previousAppPath -and (Test-Path $previousAppPath)) {
-            Remove-Item -Path $previousAppPath -Recurse -Force -ErrorAction SilentlyContinue
-          }
-
-          # Display results
-          $updateZipPath = Join-Path $outputDir "update.zip"
-          if (Test-Path $updateZipPath) {
-            $sizeMB = [Math]::Round((Get-Item $updateZipPath).Length / 1MB, 2)
-            Write-Host "Created update.zip: $sizeMB MB"
-          }
-        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-${{ matrix.arch }}
           path: |
-            delta-output/files.json
-            delta-output/files.json.sig
-            delta-output/update.zip
-            delta-output/app-*.zip
+            delta-output/windows-${{ 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:
@@ -516,9 +432,14 @@ jobs:
             libx11-6 libxrandr2 libxinerama1 \
             libxi6 libxcursor1 libxext6 \
             libxrender1 libxkbcommon-x11-0 \
-            clang zlib1g-dev \
-            libportaudio2 libasound2 \
-            libwebkit2gtk-4.1-dev
+            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
@@ -687,6 +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:
@@ -889,10 +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 app package for future delta generation (app-{version}-win-{arch}.zip)
-          find artifacts -type f -name "app-*.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"
@@ -905,6 +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:
@@ -926,12 +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/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/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,

LanMountainDesktop.Launcher/Services/LauncherFlowCoordinator.cs

@@ -184,13 +184,23 @@ internal sealed class LauncherFlowCoordinator
                     
                     var completedTask = await readyOrTimeoutOrExit;
                     
-                    // 检查是否是进程先退出（异常情况）
+                    // Host process exited before reporting Ready.
                     if (completedTask == processExitTask)
                     {
                         var exitCode = hostProcess.ExitCode;
-                        Console.Error.WriteLine($"[LauncherFlowCoordinator] Host process exited unexpectedly with code: {exitCode}");
-                        
-                        // 关闭 Splash 窗口
+                        Console.Error.WriteLine($"[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
@@ -205,7 +215,7 @@ internal sealed class LauncherFlowCoordinator
                                 Console.Error.WriteLine($"[LauncherFlowCoordinator] Error closing splash window: {ex.Message}");
                             }
                         });
-                        
+                            
                         return new LauncherResult
                         {
                             Success = false,
@@ -288,6 +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）
@@ -377,6 +514,9 @@ internal sealed class LauncherFlowCoordinator
         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,

LanMountainDesktop.Launcher/Views/LoadingDetailsWindow.axaml

@@ -1,12 +1,13 @@
-<Window xmlns="https://github.com/avaloniaui"
+<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="阑山桌面 - 加载详情"
+        Title="LanMountain Desktop - Loading Details"
         Width="600"
         Height="500"
         WindowStartupLocation="CenterScreen"
@@ -17,18 +18,17 @@
         Icon="/Assets/logo.ico">
 
   <Grid RowDefinitions="Auto,*,Auto,Auto">
-    <!-- 标题栏 -->
-    <Border Grid.Row="0" 
+    <Border Grid.Row="0"
             Background="{DynamicResource CardBackgroundFillColorDefaultBrush}"
             Padding="20,16">
       <Grid ColumnDefinitions="*,Auto">
         <StackPanel Grid.Column="0" Spacing="4">
-          <TextBlock Text="正在启动阑山桌面"
+          <TextBlock Text="Starting LanMountain Desktop"
                      FontSize="18"
                      FontWeight="SemiBold"
                      Foreground="{DynamicResource TextFillColorPrimaryBrush}"/>
           <TextBlock x:Name="SubtitleText"
-                     Text="初始化系统组件..."
+                     Text="Initializing..."
                      FontSize="13"
                      Foreground="{DynamicResource TextFillColorSecondaryBrush}"/>
         </StackPanel>
@@ -46,7 +46,6 @@
       </Grid>
     </Border>
 
-    <!-- 主要内容区域 -->
     <Grid Grid.Row="1" Margin="16,12">
       <Grid.RowDefinitions>
         <RowDefinition Height="Auto"/>
@@ -54,7 +53,6 @@
         <RowDefinition Height="*"/>
       </Grid.RowDefinitions>
 
-      <!-- 整体进度条 -->
       <ProgressBar x:Name="OverallProgressBar"
                    Grid.Row="0"
                    Height="8"
@@ -64,14 +62,12 @@
                    CornerRadius="4"
                    Margin="0,0,0,16"/>
 
-      <!-- 当前活动项 -->
       <Border Grid.Row="1"
               Background="{DynamicResource CardBackgroundFillColorSecondaryBrush}"
               CornerRadius="8"
               Padding="16,12"
               Margin="0,0,0,12">
         <Grid RowDefinitions="Auto,Auto,Auto" ColumnDefinitions="Auto,*">
-          <!-- 图标 -->
           <Border Grid.Row="0" Grid.RowSpan="3" Grid.Column="0"
                   Width="40"
                   Height="40"
@@ -88,23 +84,20 @@
                        VerticalAlignment="Center"/>
           </Border>
 
-          <!-- 名称 -->
           <TextBlock x:Name="CurrentItemName"
                      Grid.Row="0" Grid.Column="1"
-                     Text="正在初始化..."
+                     Text="Initializing..."
                      FontSize="15"
                      FontWeight="SemiBold"
                      Foreground="{DynamicResource TextFillColorPrimaryBrush}"/>
 
-          <!-- 描述 -->
           <TextBlock x:Name="CurrentItemDescription"
                      Grid.Row="1" Grid.Column="1"
-                     Text="准备加载系统组件"
+                     Text="Preparing components"
                      FontSize="13"
                      Foreground="{DynamicResource TextFillColorSecondaryBrush}"
                      Margin="0,4,0,0"/>
 
-          <!-- 进度 -->
           <Grid Grid.Row="2" Grid.Column="1" Margin="0,8,0,0">
             <ProgressBar x:Name="CurrentItemProgress"
                          Height="4"
@@ -116,15 +109,13 @@
         </Grid>
       </Border>
 
-      <!-- 加载项列表 -->
       <Border Grid.Row="2"
               Background="{DynamicResource CardBackgroundFillColorDefaultBrush}"
               CornerRadius="8">
         <Grid RowDefinitions="Auto,*">
-          <!-- 列表标题 -->
           <Grid Grid.Row="0" Margin="12,8" ColumnDefinitions="*,Auto,Auto">
             <TextBlock Grid.Column="0"
-                       Text="加载项"
+                       Text="Loading Items"
                        FontSize="12"
                        FontWeight="SemiBold"
                        Foreground="{DynamicResource TextFillColorTertiaryBrush}"/>
@@ -135,22 +126,20 @@
                        Foreground="{DynamicResource TextFillColorSecondaryBrush}"
                        Margin="0,0,4,0"/>
             <TextBlock Grid.Column="2"
-                       Text="已完成"
+                       Text="Done"
                        FontSize="12"
                        Foreground="{DynamicResource TextFillColorTertiaryBrush}"/>
           </Grid>
 
-          <!-- 列表内容 -->
           <ScrollViewer Grid.Row="1"
                         VerticalScrollBarVisibility="Auto"
                         Margin="8,0,8,8">
             <ItemsControl x:Name="LoadingItemsList">
               <ItemsControl.ItemTemplate>
-                <DataTemplate>
-                  <Grid ColumnDefinitions="Auto,*,Auto,Auto" 
+                <DataTemplate DataType="views:LoadingItemViewModel">
+                  <Grid ColumnDefinitions="Auto,*,Auto,Auto"
                         Margin="4,3"
                         Opacity="{Binding Opacity}">
-                    <!-- 状态图标 -->
                     <TextBlock Grid.Column="0"
                                Text="{Binding StatusIcon}"
                                FontSize="14"
@@ -159,7 +148,6 @@
                                Margin="0,0,8,0"
                                VerticalAlignment="Center"/>
 
-                    <!-- 名称 -->
                     <TextBlock Grid.Column="1"
                                Text="{Binding Name}"
                                FontSize="13"
@@ -167,7 +155,6 @@
                                TextTrimming="CharacterEllipsis"
                                VerticalAlignment="Center"/>
 
-                    <!-- 进度 -->
                     <TextBlock Grid.Column="2"
                                Text="{Binding ProgressText}"
                                FontSize="12"
@@ -175,7 +162,6 @@
                                Margin="8,0"
                                VerticalAlignment="Center"/>
 
-                    <!-- 类型标签 -->
                     <Border Grid.Column="3"
                             Background="{Binding TypeBackground}"
                             CornerRadius="4"
@@ -194,7 +180,6 @@
       </Border>
     </Grid>
 
-    <!-- 错误信息区域 -->
     <Border x:Name="ErrorPanel"
             Grid.Row="2"
             Background="{DynamicResource SystemFillColorCriticalBackgroundBrush}"
@@ -214,14 +199,13 @@
                    VerticalAlignment="Center"/>
         <TextBlock x:Name="ErrorText"
                    Grid.Column="1"
-                   Text="加载过程中出现错误"
+                   Text="An error occurred while loading."
                    FontSize="13"
                    Foreground="{DynamicResource SystemFillColorCriticalBrush}"
                    TextWrapping="Wrap"/>
       </Grid>
     </Border>
 
-    <!-- 底部按钮 -->
     <Border Grid.Row="3"
             Background="{DynamicResource CardBackgroundFillColorDefaultBrush}"
             Padding="16,12">
@@ -234,12 +218,12 @@
                    VerticalAlignment="Center"/>
         <StackPanel Grid.Column="1" Orientation="Horizontal" Spacing="8">
           <Button x:Name="DetailsButton"
-                  Content="查看详情"
+                  Content="Details"
                   Width="90"
                   Height="32"
                   FontSize="13"/>
           <Button x:Name="CancelButton"
-                  Content="取消"
+                  Content="Cancel"
                   Width="90"
                   Height="32"
                   FontSize="13"/>

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.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

@@ -77,6 +77,8 @@ public partial class App : Application
     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 =>
@@ -290,16 +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(
@@ -659,70 +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()
     {
@@ -885,6 +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)
@@ -935,6 +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();
@@ -1154,11 +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/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/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)
     {
@@ -81,8 +82,7 @@ public sealed class UpdateWorkflowService
     }
 
     /// <summary>
-    /// Checks whether a GitHub Release contains delta update assets (files.json, files.json.sig, update.zip).
-    /// Also supports versioned filenames like files-{version}.json, delta-{old}-to-{new}.zip
+    /// Checks whether a GitHub Release contains signed file-map assets needed for incremental updates.
     /// </summary>
     public static bool IsDeltaUpdateAvailable(GitHubReleaseInfo release)
     {
@@ -91,73 +91,11 @@ public sealed class UpdateWorkflowService
             return false;
         }
 
-        var assetNames = release.Assets.Select(a => a.Name).ToHashSet(StringComparer.OrdinalIgnoreCase);
-        
-        // Check for exact matches first (preferred)
-        var hasExactManifest = assetNames.Contains(DeltaManifestFileName);
-        var hasExactSignature = assetNames.Contains(DeltaSignatureFileName);
-        var hasExactArchive = assetNames.Contains(DeltaArchiveFileName);
-        
-        if (hasExactManifest && hasExactSignature && hasExactArchive)
-        {
-            return true;
-        }
-        
-        // Check for versioned filenames (e.g., files-1.0.0.json, delta-0.9.9-to-1.0.0.zip)
-        var hasVersionedManifest = assetNames.Any(n => n.StartsWith("files-", StringComparison.OrdinalIgnoreCase) 
-            && n.EndsWith(".json", StringComparison.OrdinalIgnoreCase));
-        var hasVersionedSignature = assetNames.Any(n => n.StartsWith("files-", StringComparison.OrdinalIgnoreCase) 
-            && n.EndsWith(".sig", StringComparison.OrdinalIgnoreCase));
-        var hasVersionedArchive = assetNames.Any(n => n.StartsWith("delta-", StringComparison.OrdinalIgnoreCase) 
-            && n.EndsWith(".zip", StringComparison.OrdinalIgnoreCase));
-        
-        return hasVersionedManifest && hasVersionedSignature && hasVersionedArchive;
-    }
-    
-    /// <summary>
-    /// Finds the best matching delta asset name from the release assets.
-    /// Prefers exact matches, falls back to versioned filenames.
-    /// </summary>
-    private static string? FindDeltaAssetName(GitHubReleaseInfo release, string baseName)
-    {
-        if (release?.Assets is null)
-        {
-            return null;
-        }
-        
-        // Try exact match first
-        var exactMatch = release.Assets.FirstOrDefault(a => 
-            string.Equals(a.Name, baseName, StringComparison.OrdinalIgnoreCase));
-        if (exactMatch != null)
-        {
-            return exactMatch.Name;
-        }
-        
-        // Fall back to pattern matching
-        return baseName.ToLowerInvariant() switch
-        {
-            "files.json" => release.Assets
-                .Where(a => a.Name.StartsWith("files-", StringComparison.OrdinalIgnoreCase) 
-                    && a.Name.EndsWith(".json", StringComparison.OrdinalIgnoreCase))
-                .OrderByDescending(a => a.Name.Length)
-                .FirstOrDefault()?.Name,
-            "files.json.sig" => release.Assets
-                .Where(a => a.Name.StartsWith("files-", StringComparison.OrdinalIgnoreCase) 
-                    && a.Name.EndsWith(".sig", StringComparison.OrdinalIgnoreCase))
-                .OrderByDescending(a => a.Name.Length)
-                .FirstOrDefault()?.Name,
-            "update.zip" => release.Assets
-                .Where(a => a.Name.StartsWith("delta-", StringComparison.OrdinalIgnoreCase) 
-                    && a.Name.EndsWith(".zip", StringComparison.OrdinalIgnoreCase))
-                .OrderByDescending(a => a.Name.Length)
-                .FirstOrDefault()?.Name,
-            _ => null
-        };
+        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,
@@ -171,9 +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();
@@ -191,55 +129,19 @@ public sealed class UpdateWorkflowService
         var downloadSource = state.UpdateDownloadSource;
         var downloadThreads = state.UpdateDownloadThreads;
 
-        // Find the actual asset names (support both exact and versioned filenames)
-        var manifestAssetName = FindDeltaAssetName(checkResult.Release, DeltaManifestFileName);
-        var signatureAssetName = FindDeltaAssetName(checkResult.Release, DeltaSignatureFileName);
-        var archiveAssetName = FindDeltaAssetName(checkResult.Release, DeltaArchiveFileName);
-        
-        if (manifestAssetName is null || signatureAssetName is null || archiveAssetName is null)
+        var requiredAssets = new List<(GitHubReleaseAsset Asset, string DestinationFileName)>
         {
-            return new UpdateDownloadResult(false, null, "One or more delta assets not found in release.");
-        }
-        
-        // Build asset map with actual names from release
-        var assetMap = new Dictionary<string, string>(StringComparer.OrdinalIgnoreCase)
-        {
-            [DeltaManifestFileName] = manifestAssetName,
-            [DeltaSignatureFileName] = signatureAssetName,
-            [DeltaArchiveFileName] = archiveAssetName
+            (manifestAsset, SignedFileMapName),
+            (signatureAsset, SignedFileMapSignatureName),
+            (archiveAsset, UpdateArchiveName)
         };
-        
-        var requiredAssets = new Dictionary<string, GitHubReleaseAsset>(StringComparer.OrdinalIgnoreCase)
-        {
-            [DeltaManifestFileName] = null!,
-            [DeltaSignatureFileName] = null!,
-            [DeltaArchiveFileName] = null!
-        };
-
-        foreach (var asset in checkResult.Release.Assets)
-        {
-            // Match by actual asset name
-            foreach (var (key, actualName) in assetMap)
-            {
-                if (string.Equals(asset.Name, actualName, StringComparison.OrdinalIgnoreCase))
-                {
-                    requiredAssets[key] = asset;
-                    break;
-                }
-            }
-        }
-
-        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))
@@ -247,7 +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;
@@ -271,21 +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
@@ -294,13 +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()
     {
@@ -311,11 +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>

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

@@ -1,105 +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
-Write-Host "  目录: $PreviousDir" -ForegroundColor Gray
-if (-not (Test-Path $PreviousDir)) {
-    throw "Previous directory does not exist: $PreviousDir"
+function New-DeltaArchive {
+    param(
+        [Parameter(Mandatory = $true)]
+        [string]$ZipPath,
+
+        [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
-Write-Host "  找到 $($previousManifest.Count) 个文件" -ForegroundColor Gray
-
-Write-Host "扫描当前版本文件..." -ForegroundColor Yellow
-Write-Host "  目录: $CurrentDir" -ForegroundColor Gray
-if (-not (Test-Path $CurrentDir)) {
-    throw "Current directory does not exist: $CurrentDir"
-}
 $currentManifest = Get-FileManifest -RootDir $CurrentDir
-Write-Host "  找到 $($currentManifest.Count) 个文件" -ForegroundColor Gray
 
-# 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 = $currentFile.Sha256
@@ -107,9 +167,9 @@ foreach ($path in $currentManifest.Keys) {
                 ArchivePath = $path
             }
         }
-    } else {
-        # 新增文件
-        $changedFiles += @{
+    }
+    else {
+        $changedFiles += [ordered]@{
             Path = $path
             Action = "add"
             Sha256 = $currentFile.Sha256
@@ -119,104 +179,51 @@ foreach ($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)"
 
-# 显示前10个变更的文件（用于调试）
-if ($changedFiles.Count -gt 0) {
-    Write-Host "变更的文件示例:" -ForegroundColor Cyan
-    $changedFiles | Select-Object -First 10 | ForEach-Object {
-        Write-Host "  [$($_.Action)] $($_.Path)" -ForegroundColor Gray
-    }
-    if ($changedFiles.Count -gt 10) {
-        Write-Host "  ... 还有 $($changedFiles.Count - 10) 个文件" -ForegroundColor Gray
-    }
-    Write-Host ""
-}
-
-# 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 $tempDir | Out-Null
-
-# 复制变更的文件到临时目录
-Write-Host "复制变更文件..." -ForegroundColor Yellow
-foreach ($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 $destPath -Force
-}
-
-# 创建 update.zip (Launcher 期望的文件名)
+$resolvedCurrentDir = (Resolve-Path -LiteralPath $CurrentDir).Path
 $updateZipPath = Join-Path $OutputDir "update.zip"
-Write-Host "创建增量包: $updateZipPath" -ForegroundColor Yellow
+New-DeltaArchive -ZipPath $updateZipPath -CurrentRoot $resolvedCurrentDir -ChangedFiles $changedFiles
 
-if (Test-Path $updateZipPath) {
-    Remove-Item -Path $updateZipPath -Force
-}
+$deltaZipPath = Join-Path $OutputDir ("delta-{0}-to-{1}.zip" -f $PreviousVersion, $CurrentVersion)
+Copy-Item -LiteralPath $updateZipPath -Destination $deltaZipPath -Force
 
-Compress-Archive -Path "$tempDir\*" -DestinationPath $updateZipPath -CompressionLevel Optimal
-
-# 同时创建带版本号的副本（用于发布到 GitHub Release）
-$deltaZipPath = Join-Path $OutputDir "delta-$PreviousVersion-to-$CurrentVersion.zip"
-Write-Host "创建带版本号的副本: $deltaZipPath" -ForegroundColor Yellow
-if (Test-Path $deltaZipPath) {
-    Remove-Item -Path $deltaZipPath -Force
-}
-Copy-Item -Path $updateZipPath -Destination $deltaZipPath -Force
-
-# 清理临时目录
-Remove-Item -Path $tempDir -Recurse -Force
-
-# 生成 files.json (Launcher 期望的文件名)
-$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
 }
 
+$jsonText = $filesJson | ConvertTo-Json -Depth 10
+$utf8NoBom = New-Object System.Text.UTF8Encoding($false)
+
 $filesJsonPath = Join-Path $OutputDir "files.json"
-Write-Host "生成文件清单: $filesJsonPath" -ForegroundColor Yellow
+[System.IO.File]::WriteAllText($filesJsonPath, $jsonText, $utf8NoBom)
 
-$filesJson | ConvertTo-Json -Depth 10 | Set-Content -Path $filesJsonPath -Encoding UTF8
+$versionedFilesJsonPath = Join-Path $OutputDir ("files-{0}.json" -f $CurrentVersion)
+Copy-Item -LiteralPath $filesJsonPath -Destination $versionedFilesJsonPath -Force
 
-# 同时创建带版本号的副本（用于发布到 GitHub Release）
-$versionedFilesJsonPath = Join-Path $OutputDir "files-$CurrentVersion.json"
-Write-Host "创建带版本号的副本: $versionedFilesJsonPath" -ForegroundColor Yellow
-Copy-Item -Path $filesJsonPath -Destination $versionedFilesJsonPath -Force
-
-# 计算增量包大小
-$updateSize = (Get-Item $updateZipPath).Length
-$updateSizeMB = [math]::Round($updateSize / 1MB, 2)
+$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: $updateSizeMB MB"
-Write-Host "输出文件 (Launcher 使用):"
-Write-Host "  - $updateZipPath"
-Write-Host "  - $filesJsonPath"
-Write-Host "输出文件 (GitHub Release 发布):"
-Write-Host "  - $deltaZipPath"
-Write-Host "  - $versionedFilesJsonPath"
+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"