feat.Penguin Logistics Online Network Distribution System

.github/workflows/release.yml

@@ -1,4 +1,4 @@
-name: Release
+name: Release
 
 on:
   push:
@@ -127,7 +127,7 @@ jobs:
             exit 1
           }
 
-          # 鏄剧ず鍙戝竷缁撴灉
+          # 閺勫墽銇氶崣鎴濈缂佹挻鐏?
           Write-Host "Launcher published to: $launcherPublishDir"
           $exeFile = Get-ChildItem -Path $launcherPublishDir -Filter "*.exe" | Select-Object -First 1
           if ($exeFile) {
@@ -712,25 +712,18 @@ jobs:
           if-no-files-found: error
           retention-days: 30
 
-  publish-pdc:
-    needs: [ prepare, build-windows, build-linux, build-macos ]
+  publish-plonds:
+    needs: [ prepare, build-windows, build-linux ]
     runs-on: ubuntu-latest
     permissions:
       contents: read
     env:
       VERSION: ${{ needs.prepare.outputs.version }}
-      PRIMARY_VERSION: ${{ needs.prepare.outputs.version }}
-      PDCC_primaryVersion: ${{ needs.prepare.outputs.version }}
-      PDCC_version: ${{ needs.prepare.outputs.version }}
-      PDC_CLIENT_VERSION: ${{ vars.PDC_CLIENT_VERSION || '1.0.1.0' }}
       S3_ENDPOINT: ${{ vars.S3_ENDPOINT }}
       S3_BUCKET: ${{ vars.S3_BUCKET }}
       S3_REGION: ${{ vars.S3_REGION }}
-      PDC_ENDPOINT: ${{ vars.PDC_ENDPOINT }}
-      PDC_TOKEN: ${{ secrets.PDC_TOKEN }}
-      PDC_SIGNING_KEY: ${{ secrets.PDC_SIGNING_KEY }}
-      PDC_SIGNING_KEY_PS: ${{ secrets.PDC_SIGNING_KEY_PS }}
       UPDATE_PRIVATE_KEY_PEM: ${{ secrets.UPDATE_PRIVATE_KEY_PEM }}
+      PLONDS_SIGNING_KEY: ${{ secrets.PLONDS_SIGNING_KEY }}
       S3_ACCESS_KEY: ${{ secrets.S3_ACCESS_KEY }}
       S3_SECRET_KEY: ${{ secrets.S3_SECRET_KEY }}
       AWS_ACCESS_KEY_ID: ${{ secrets.S3_ACCESS_KEY }}
@@ -738,461 +731,80 @@ jobs:
       AWS_DEFAULT_REGION: ${{ vars.S3_REGION }}
       AWS_REGION: ${{ vars.S3_REGION }}
       AWS_EC2_METADATA_DISABLED: "true"
-    steps:
-      - name: Checkout
-        uses: actions/checkout@v4
-        with:
-          fetch-depth: 0
-          submodules: recursive
-          ref: ${{ needs.prepare.outputs.checkout_ref }}
 
-      - name: Download payload artifacts
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Setup .NET
+        uses: actions/setup-dotnet@v4
+        with:
+          dotnet-version: ${{ env.DOTNET_VERSION }}
+          dotnet-quality: 'preview'
+
+      - name: Download app payload artifacts
         uses: actions/download-artifact@v4
         with:
-          path: payload-artifacts
+          path: artifacts/app-payload
           pattern: app-payload-*
 
       - name: Download installer artifacts
         uses: actions/download-artifact@v4
         with:
-          path: installer-artifacts
+          path: artifacts/installers
           pattern: installer-*
 
-      - name: Prepare PDC environment
+      - name: Prepare signing key
         shell: pwsh
         run: |
           $ErrorActionPreference = "Stop"
 
-          function Resolve-PgpPrivateKey([string]$value) {
-            if ([string]::IsNullOrWhiteSpace($value)) {
-              return $null
-            }
-
-            $trimmed = $value.Trim()
-            if ($trimmed -match '-----BEGIN PGP PRIVATE KEY BLOCK-----') {
-              return $trimmed
-            }
-
-            try {
-              $decoded = [System.Text.Encoding]::UTF8.GetString([Convert]::FromBase64String($trimmed)).Trim()
-              if ($decoded -match '-----BEGIN PGP PRIVATE KEY BLOCK-----') {
-                return $decoded
-              }
-            }
-            catch {
-            }
-
-            return $trimmed
+          $key = $env:PLONDS_SIGNING_KEY
+          if ([string]::IsNullOrWhiteSpace($key)) {
+            $key = $env:UPDATE_PRIVATE_KEY_PEM
+          }
+          if ([string]::IsNullOrWhiteSpace($key)) {
+            throw "Missing PLONDS_SIGNING_KEY or UPDATE_PRIVATE_KEY_PEM."
           }
 
-          if ([string]::IsNullOrWhiteSpace($env:S3_ENDPOINT) -or
-              [string]::IsNullOrWhiteSpace($env:S3_BUCKET)) {
-            throw "Missing required S3 variables."
-          }
+          $keyPath = Join-Path $PWD "update-private-key.pem"
+          [System.IO.File]::WriteAllText($keyPath, $key, [System.Text.Encoding]::ASCII)
+          Add-Content -Path $env:GITHUB_ENV -Value "UPDATE_PRIVATE_KEY_PATH=$keyPath"
 
-          $resolvedSigningKey = Resolve-PgpPrivateKey $env:PDC_SIGNING_KEY
-          if ([string]::IsNullOrWhiteSpace($resolvedSigningKey)) {
-            $resolvedSigningKey = Resolve-PgpPrivateKey $env:UPDATE_PRIVATE_KEY_PEM
-          }
-          if ([string]::IsNullOrWhiteSpace($resolvedSigningKey)) {
-            throw "Missing PDC_SIGNING_KEY (PGP private key)."
-          }
-          if ($resolvedSigningKey -notmatch '-----BEGIN PGP PRIVATE KEY BLOCK-----') {
-            throw "PDC signing key format is invalid. Please provide armored OpenPGP private key in PDC_SIGNING_KEY."
-          }
-          Add-Content -Path $env:GITHUB_ENV -Value "PDC_SIGNING_KEY<<EOF`n$resolvedSigningKey`nEOF"
+      - name: Probe S3 access
+        if: ${{ env.S3_ENDPOINT != '' && env.S3_BUCKET != '' && env.S3_ACCESS_KEY != '' && env.S3_SECRET_KEY != '' }}
+        shell: bash
+        run: |
+          set -euo pipefail
+          aws --endpoint-url "$S3_ENDPOINT" --region "$S3_REGION" s3 ls "s3://$S3_BUCKET" --only-show-errors >/dev/null
+          echo "S3 access probe succeeded for $S3_BUCKET"
 
-          $workRoot = Join-Path $PWD "pdc-work"
-          if (Test-Path $workRoot) {
-            Remove-Item -LiteralPath $workRoot -Recurse -Force
-          }
-          New-Item -ItemType Directory -Path $workRoot -Force | Out-Null
-
-          $template = Get-Content -Path "phainon.yml" -Raw
-          $resolved = $template `
-            -replace '__FILE_REPO_ROOT__', "$($env:S3_ENDPOINT.TrimEnd('/'))/$($env:S3_BUCKET)/lanmountain/update/repo/" `
-            -replace '__ARCHIVE_ROOT__', "$($env:S3_ENDPOINT.TrimEnd('/'))/$($env:S3_BUCKET)/lanmountain/update/archive"
-
-          Set-Content -Path (Join-Path $workRoot "phainon.resolved.yml") -Value $resolved -NoNewline
-
-          python3 -m pip install --user --upgrade awscli
-          Add-Content -Path $env:GITHUB_PATH -Value "$HOME/.local/bin"
-
-      - name: Verify S3 credentials and endpoint
+      - name: Build PLONDS assets
         shell: pwsh
         run: |
           $ErrorActionPreference = "Stop"
 
-          function Invoke-AwsChecked([string[]]$Arguments) {
-            & aws @Arguments
-            if ($LASTEXITCODE -ne 0) {
-              throw "aws command failed: aws $($Arguments -join ' ')"
-            }
-          }
+          ./scripts/Publish-Plonds.ps1 `
+            -Version $env:VERSION `
+            -AppArtifactsRoot (Join-Path $PWD "artifacts/app-payload") `
+            -InstallerArtifactsRoot (Join-Path $PWD "artifacts/installers") `
+            -OutputDir (Join-Path $PWD "plonds-output") `
+            -PrivateKeyPath $env:UPDATE_PRIVATE_KEY_PATH `
+            -Channel "stable" `
+            -S3Endpoint $env:S3_ENDPOINT `
+            -S3Bucket $env:S3_BUCKET `
+            -S3Region $env:S3_REGION
 
-          $probeDir = Join-Path $PWD "pdc-work"
-          New-Item -ItemType Directory -Path $probeDir -Force | Out-Null
-
-          $probeFile = Join-Path $probeDir "s3-probe.txt"
-          Set-Content -Path $probeFile -Value "lanmountain pdc probe $(Get-Date -Format o)" -NoNewline
-
-          $probeKey = "lanmountain/update/probe/$($env:GITHUB_RUN_ID)-$($env:GITHUB_RUN_ATTEMPT).txt"
-          Invoke-AwsChecked @("--endpoint-url", "$env:S3_ENDPOINT", "--region", "$env:S3_REGION", "s3", "cp", $probeFile, "s3://$env:S3_BUCKET/$probeKey", "--only-show-errors")
-          Invoke-AwsChecked @("--endpoint-url", "$env:S3_ENDPOINT", "--region", "$env:S3_REGION", "s3", "rm", "s3://$env:S3_BUCKET/$probeKey", "--only-show-errors")
-          Write-Host "S3 probe succeeded."
-
-      - name: Bootstrap PDC Endpoint and Token
-        shell: pwsh
-        run: |
-          $ErrorActionPreference = "Stop"
-
-          $endpoint = $env:PDC_ENDPOINT
-          if ([string]::IsNullOrWhiteSpace($endpoint)) {
-            $endpoint = "http://127.0.0.1:18765"
-          }
-
-          $token = $env:PDC_TOKEN
-          if ([string]::IsNullOrWhiteSpace($token)) {
-            $token = "lmd-pdc-local-token"
-          }
-
-          Add-Content -Path $env:GITHUB_ENV -Value "PDC_ENDPOINT=$endpoint"
-          Add-Content -Path $env:GITHUB_ENV -Value "PDC_TOKEN=$token"
-          Write-Host "Using PDC endpoint: $endpoint"
-
-      - name: Start Local PDC Mock (Fallback)
-        shell: pwsh
-        run: |
-          $ErrorActionPreference = "Stop"
-
-          if ([string]::IsNullOrWhiteSpace($env:PDC_ENDPOINT)) {
-            throw "PDC_ENDPOINT is empty after bootstrap."
-          }
-
-          $uri = [Uri]$env:PDC_ENDPOINT
-          $isLocalHost = $uri.Host -eq "127.0.0.1" -or $uri.Host -eq "localhost"
-          if (-not $isLocalHost) {
-            Write-Host "Using external PDC endpoint: $($env:PDC_ENDPOINT)"
-            exit 0
-          }
-
-          if ([string]::IsNullOrWhiteSpace($env:PDC_TOKEN)) {
-            throw "PDC_TOKEN is empty after bootstrap."
-          }
-
-          $port = if ($uri.Port -gt 0) { $uri.Port } else { 18765 }
-          $dataDir = Join-Path $PWD "pdc-output/mock-pdc"
-          $workDir = Join-Path $PWD "pdc-work"
-          $logPath = Join-Path $workDir "pdc-mock.out.log"
-          $errLogPath = Join-Path $workDir "pdc-mock.err.log"
-
-          New-Item -ItemType Directory -Path $workDir -Force | Out-Null
-          New-Item -ItemType Directory -Path $dataDir -Force | Out-Null
-          if (Test-Path $logPath) {
-            Remove-Item -LiteralPath $logPath -Force
-          }
-          if (Test-Path $errLogPath) {
-            Remove-Item -LiteralPath $errLogPath -Force
-          }
-
-          $args = @(
-            "scripts/pdc-mock-server.py",
-            "--host", "127.0.0.1",
-            "--port", $port.ToString(),
-            "--token", $env:PDC_TOKEN,
-            "--data-dir", $dataDir
-          )
-          $process = Start-Process -FilePath "python3" -ArgumentList $args -PassThru -RedirectStandardOutput $logPath -RedirectStandardError $errLogPath
-          if (-not $process) {
-            throw "Failed to launch PDC mock server."
-          }
-
-          $healthUrl = "http://127.0.0.1:$port/healthz"
-          $ready = $false
-          for ($i = 0; $i -lt 20; $i++) {
-            Start-Sleep -Seconds 1
-            try {
-              $response = Invoke-WebRequest -Uri $healthUrl -Method Get -TimeoutSec 2
-              if ($response.StatusCode -eq 200) {
-                $ready = $true
-                break
-              }
-            }
-            catch {
-            }
-          }
-
-          if (-not $ready) {
-            if (Test-Path $logPath) {
-              Write-Host "===== pdc-mock stdout ====="
-              Get-Content -LiteralPath $logPath -ErrorAction SilentlyContinue | Write-Host
-            }
-            if (Test-Path $errLogPath) {
-              Write-Host "===== pdc-mock stderr ====="
-              Get-Content -LiteralPath $errLogPath -ErrorAction SilentlyContinue | Write-Host
-            }
-            throw "PDC mock server did not become ready in time. See $logPath and $errLogPath."
-          }
-
-          Write-Host "Local PDC mock is running at http://127.0.0.1:$port"
-
-      - name: Install PDCC
-        shell: pwsh
-        env:
-          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
-        run: |
-          ./scripts/Install-Pdcc.ps1 -Repository "ClassIsland/PhainonDistributionCenter" -Version "$env:PDC_CLIENT_VERSION" -OutputDir "./pdcc"
-
-      - name: Publish with PDCC
-        shell: pwsh
-        run: |
-          $ErrorActionPreference = "Stop"
-          # Map CI vars to the naming convention expected by PDCC tooling.
-          $env:S3_Endpoint = $env:S3_ENDPOINT
-          $env:S3_Bucket = $env:S3_BUCKET
-          $env:S3_Region = $env:S3_REGION
-          $env:PDC_Endpoint = $env:PDC_ENDPOINT
-          $env:PDC_Token = $env:PDC_TOKEN
-          $env:S3_AccessKey = $env:S3_ACCESS_KEY
-          $env:S3_SecretKey = $env:S3_SECRET_KEY
-          $signingKeyPs = $env:PDC_SIGNING_KEY_PS
-          if ([string]::IsNullOrWhiteSpace($signingKeyPs)) {
-            # Keep a non-empty value so PDCC required-env check passes on Linux runners.
-            $signingKeyPs = " "
-          }
-          $env:PDC_SigningKeyPs = $signingKeyPs
-          # Map config variables with exact names required by phainon placeholders.
-          $env:PDCC_version = $env:VERSION
-          $env:PDCC_primaryVersion = $env:PRIMARY_VERSION
-          $signingKey = $env:PDC_SIGNING_KEY
-          if ([string]::IsNullOrWhiteSpace($signingKey)) {
-            $signingKey = $env:UPDATE_PRIVATE_KEY_PEM
-          }
-          if ([string]::IsNullOrWhiteSpace($signingKey)) {
-            throw "Missing PDC signing key: PDC_SIGNING_KEY or UPDATE_PRIVATE_KEY_PEM."
-          }
-          if ($signingKey -notmatch '-----BEGIN PGP PRIVATE KEY BLOCK-----') {
-            throw "PDC signing key is not an armored OpenPGP private key."
-          }
-          $env:PDC_SigningKey = $signingKey
-
-          $workDir = Join-Path $PWD "pdc-work"
-          $stageRoot = Join-Path $PWD "pdc-stage"
-          $payloadRoot = Join-Path $PWD "payload-artifacts"
-          $installerRoot = Join-Path $PWD "installer-artifacts"
-          $outRoot = Join-Path $PWD "pdc-output"
-          $publishRoot = Join-Path $outRoot "published"
-          $client = Join-Path $PWD "pdcc/PhainonDistributionCenter.Client"
-          $config = Join-Path $workDir "phainon.resolved.yml"
-
-          New-Item -ItemType Directory -Path $workDir -Force | Out-Null
-          if (-not (Test-Path -LiteralPath $config)) {
-            throw "Resolved PDCC config was not found: $config"
-          }
-          if (-not (Test-Path -LiteralPath $client)) {
-            throw "PDCC client was not found: $client"
-          }
-
-          if (Test-Path $stageRoot) {
-            Remove-Item -LiteralPath $stageRoot -Recurse -Force
-          }
-          if (Test-Path $outRoot) {
-            Remove-Item -LiteralPath $outRoot -Recurse -Force
-          }
-          New-Item -ItemType Directory -Path $stageRoot -Force | Out-Null
-          New-Item -ItemType Directory -Path $outRoot -Force | Out-Null
-          New-Item -ItemType Directory -Path $publishRoot -Force | Out-Null
-
-          $payloadArtifacts = Get-ChildItem -LiteralPath $payloadRoot -Directory
-          if (-not $payloadArtifacts) {
-            throw "No payload artifacts were downloaded."
-          }
-
-          $installerArtifacts = Get-ChildItem -LiteralPath $installerRoot -Directory
-          if (-not $installerArtifacts) {
-            throw "No installer artifacts were downloaded."
-          }
-
-          foreach ($installerArtifact in $installerArtifacts) {
-            $stagedInstallerDir = Join-Path $stageRoot "installers/$($installerArtifact.Name)"
-            ./scripts/Prepare-PdccOut.ps1 -SourceDir $installerArtifact.FullName -OutputDir $stagedInstallerDir
-          }
-
-          foreach ($payloadArtifact in $payloadArtifacts) {
-            $platformKey = $payloadArtifact.Name -replace '^app-payload-', ''
-            $stagedPayloadDir = Join-Path $stageRoot "payloads/$platformKey"
-            ./scripts/Prepare-PdccOut.ps1 -SourceDir $payloadArtifact.FullName -OutputDir $stagedPayloadDir
-
-            $parts = $platformKey.Split('-', 2)
-            if ($parts.Count -lt 2) {
-              throw "Invalid platform key format: $platformKey"
-            }
-            $os = $parts[0]
-            $arch = $parts[1]
-            $packageName = "LanMountainDesktop_app_${os}_${arch}_release_folder.zip"
-            $packagePath = Join-Path $publishRoot $packageName
-
-            Write-Host "Preparing PDCC subchannel package for $platformKey..."
-            & $client $config GenerateFileMap $stagedPayloadDir
-            if ($LASTEXITCODE -ne 0) {
-              throw "PDCC GenerateFileMap failed for $platformKey."
-            }
-
-            if (Test-Path $packagePath) {
-              Remove-Item -LiteralPath $packagePath -Force
-            }
-            Compress-Archive -Path (Join-Path $stagedPayloadDir '*') -DestinationPath $packagePath -Force
-            $packageSizeMb = [Math]::Round((Get-Item -LiteralPath $packagePath).Length / 1MB, 2)
-            Write-Host "Prepared package: $packageName ($packageSizeMb MB)"
-          }
-
-          $subchannelPackages = Get-ChildItem -LiteralPath $publishRoot -File -Filter "LanMountainDesktop_app_*_release_folder.zip"
-          if (-not $subchannelPackages) {
-            throw "No PDCC subchannel packages were prepared."
-          }
-
-          Write-Host "Publishing $($subchannelPackages.Count) subchannels in a single PDCC Publish run..."
-          $subchannelPackages | Sort-Object Name | ForEach-Object { Write-Host " - $($_.Name)" }
-
-          $publishStdOut = Join-Path $workDir "pdcc-publish.stdout.log"
-          $publishStdErr = Join-Path $workDir "pdcc-publish.stderr.log"
-          if (Test-Path $publishStdOut) {
-            Remove-Item -LiteralPath $publishStdOut -Force
-          }
-          if (Test-Path $publishStdErr) {
-            Remove-Item -LiteralPath $publishStdErr -Force
-          }
-
-          function Write-NewLogLines([string]$path, [ref]$lineCount, [string]$prefix) {
-            if (-not (Test-Path -LiteralPath $path)) {
-              return
-            }
-
-            $lines = Get-Content -LiteralPath $path -ErrorAction SilentlyContinue
-            if ($null -eq $lines) {
-              return
-            }
-
-            if ($lines -is [string]) {
-              $lines = @($lines)
-            }
-
-            if ($lines.Count -le $lineCount.Value) {
-              return
-            }
-
-            for ($i = $lineCount.Value; $i -lt $lines.Count; $i++) {
-              Write-Host "[$prefix] $($lines[$i])"
-            }
-
-            $lineCount.Value = $lines.Count
-          }
-
-          $publishArgs = @(
-            $config,
-            "Publish",
-            $env:PRIMARY_VERSION,
-            $env:VERSION,
-            $publishRoot
-          )
-          $publishTimeoutMinutes = 20
-          if (-not [string]::IsNullOrWhiteSpace($env:PDC_PUBLISH_TIMEOUT_MINUTES)) {
-            $parsedTimeout = 0
-            if ([int]::TryParse($env:PDC_PUBLISH_TIMEOUT_MINUTES, [ref]$parsedTimeout) -and $parsedTimeout -gt 0) {
-              $publishTimeoutMinutes = $parsedTimeout
-            }
-          }
-
-          $publishProcess = Start-Process `
-            -FilePath $client `
-            -ArgumentList $publishArgs `
-            -WorkingDirectory $publishRoot `
-            -RedirectStandardOutput $publishStdOut `
-            -RedirectStandardError $publishStdErr `
-            -PassThru
-          if (-not $publishProcess) {
-            throw "Failed to start PDCC Publish process."
-          }
-
-          Write-Host "PDCC Publish process started. PID=$($publishProcess.Id), timeout=${publishTimeoutMinutes}m"
-          $publishStart = Get-Date
-          $stdoutLineCount = 0
-          $stderrLineCount = 0
-
-          while (-not $publishProcess.HasExited) {
-            Start-Sleep -Seconds 15
-            $publishProcess.Refresh()
-            Write-NewLogLines -path $publishStdOut -lineCount ([ref]$stdoutLineCount) -prefix "pdcc"
-            Write-NewLogLines -path $publishStdErr -lineCount ([ref]$stderrLineCount) -prefix "pdcc-err"
-
-            $elapsed = (Get-Date) - $publishStart
-            Write-Host ("PDCC Publish heartbeat: elapsed={0:mm\\:ss}, pid={1}" -f $elapsed, $publishProcess.Id)
-
-            if ($elapsed.TotalMinutes -ge $publishTimeoutMinutes) {
-              Stop-Process -Id $publishProcess.Id -Force -ErrorAction SilentlyContinue
-              throw "PDCC Publish exceeded timeout of ${publishTimeoutMinutes} minutes."
-            }
-          }
-
-          Write-NewLogLines -path $publishStdOut -lineCount ([ref]$stdoutLineCount) -prefix "pdcc"
-          Write-NewLogLines -path $publishStdErr -lineCount ([ref]$stderrLineCount) -prefix "pdcc-err"
-
-          if ($publishProcess.ExitCode -ne 0) {
-            throw "PDCC Publish failed with exit code $($publishProcess.ExitCode)."
-          }
-
-          if (Test-Path (Join-Path $stageRoot "installers")) {
-            & aws --endpoint-url "$env:S3_ENDPOINT" --region "$env:S3_REGION" s3 sync (Join-Path $stageRoot "installers") "s3://$env:S3_BUCKET/lanmountain/update/installers/" --only-show-errors
-            if ($LASTEXITCODE -ne 0) {
-              throw "aws s3 sync failed for installer mirror upload."
-            }
-          }
-
-      - name: Upload PDC Assets
+      - name: Upload PLONDS assets
         uses: actions/upload-artifact@v4
         with:
-          name: pdc-assets
+          name: plonds-assets
           path: |
-            pdc-output/published/**
+            plonds-output/release-assets/**
+            plonds-output/published/**
           if-no-files-found: error
           retention-days: 90
-
-      - name: Dump PDC Diagnostics
-        if: failure()
-        shell: pwsh
-        run: |
-          if (Test-Path "pdc-work/pdc-mock.out.log") {
-            Write-Host "===== pdc-mock stdout ====="
-            Get-Content "pdc-work/pdc-mock.out.log" -ErrorAction SilentlyContinue | Write-Host
-          }
-
-          if (Test-Path "pdc-work/pdc-mock.err.log") {
-            Write-Host "===== pdc-mock stderr ====="
-            Get-Content "pdc-work/pdc-mock.err.log" -ErrorAction SilentlyContinue | Write-Host
-          }
-
-          if (Test-Path "pdc-output/mock-pdc") {
-            Write-Host "===== pdc-mock captured payloads ====="
-            Get-ChildItem "pdc-output/mock-pdc" -Recurse -File | ForEach-Object {
-              Write-Host "--- $($_.FullName) ---"
-              Get-Content $_.FullName -ErrorAction SilentlyContinue | Write-Host
-            }
-          }
-
-      - name: Upload PDC Diagnostics Artifact
-        if: always()
-        uses: actions/upload-artifact@v4
-        with:
-          name: pdc-diagnostics
-          path: |
-            pdc-work/pdc-mock*.log
-            pdc-work/pdcc-publish*.log
-            pdc-output/mock-pdc/**
-          if-no-files-found: ignore
-          retention-days: 30
-
   github-release:
-    needs: [ prepare, build-windows, build-linux, build-macos, publish-pdc ]
+    needs: [ prepare, build-windows, build-linux, build-macos, publish-plonds ]
     runs-on: ubuntu-latest
     permissions:
       contents: write
@@ -1204,11 +816,11 @@ jobs:
           path: artifacts/installers
           pattern: installer-*
 
-      - name: Download PDC artifacts
+      - name: Download PLONDS artifacts
         uses: actions/download-artifact@v4
         with:
-          path: artifacts/pdc
-          pattern: pdc-assets
+          path: artifacts/plonds
+          pattern: plonds-assets
 
       - name: List artifacts structure
         run: |
@@ -1226,7 +838,7 @@ jobs:
           echo "Organizing artifacts..."
           mkdir -p release-files
           find artifacts/installers -type f \( -name "*.exe" -o -name "*.deb" -o -name "*.dmg" \) -exec cp -v {} release-files/ \;
-          find artifacts/pdc -type f \( -name "files-*.json" -o -name "files-*.json.sig" -o -name "update-*.zip" \) -exec cp -v {} release-files/ \;
+          find artifacts/plonds -type f \( -name "files-*.json" -o -name "files-*.json.sig" -o -name "update-*.zip" -o -name "plonds-*.json" -o -name "plonds-*.json.sig" \) -exec cp -v {} release-files/ \;
           echo ""
           echo "Files ready for release:"
           ls -lh release-files/ || echo "No files found in release-files"
@@ -1260,12 +872,12 @@ jobs:
 
             Installation: Double-click the .exe file and follow the wizard.
 
-            ### Incremental Update Assets
+            ### Incremental Update Assets`n            - **plonds-filemap-windows-x64.json / plonds-filemap-windows-x64.json.sig**`n            - **plonds-filemap-windows-x86.json / plonds-filemap-windows-x86.json.sig**`n            - **plonds-filemap-linux-x64.json / plonds-filemap-linux-x64.json.sig**`n`n            ### Legacy Fallback Assets
             - **files-windows-x64.json / files-windows-x64.json.sig / update-windows-x64.zip**
             - **files-windows-x86.json / files-windows-x86.json.sig / update-windows-x86.zip**
             - **files-linux-x64.json / files-linux-x64.json.sig / update-linux-x64.zip**
 
-            Existing users: Launcher will detect platform-matching signed assets and apply update on next startup.
+            Existing users: Host will prefer staged PLONDS payloads and keep the Launcher responsible for apply + rollback. Legacy signed file-map assets remain attached as a fallback path.
 
             ### Linux
             - **LanMountainDesktop-${{ needs.prepare.outputs.version }}-linux-x64.deb** - Debian package (x64)
@@ -1276,3 +888,4 @@ jobs:
 
             See commits for changes.
           token: ${{ secrets.GITHUB_TOKEN }}
+

LanMountainDesktop.Launcher/AppJsonContext.cs

@@ -9,11 +9,11 @@ namespace LanMountainDesktop.Launcher;
 [JsonSourceGenerationOptions(WriteIndented = true, PropertyNamingPolicy = JsonKnownNamingPolicy.CamelCase)]
 [JsonSerializable(typeof(SignedFileMap))]
 [JsonSerializable(typeof(UpdateFileEntry))]
-[JsonSerializable(typeof(PdcUpdateMetadata))]
-[JsonSerializable(typeof(PdcFileMap))]
-[JsonSerializable(typeof(PdcComponentEntry))]
-[JsonSerializable(typeof(PdcFileEntry))]
-[JsonSerializable(typeof(PdcHashDescriptor))]
+[JsonSerializable(typeof(PlondsUpdateMetadata))]
+[JsonSerializable(typeof(PlondsFileMap))]
+[JsonSerializable(typeof(PlondsComponentEntry))]
+[JsonSerializable(typeof(PlondsFileEntry))]
+[JsonSerializable(typeof(PlondsHashDescriptor))]
 [JsonSerializable(typeof(SnapshotMetadata))]
 [JsonSerializable(typeof(AppVersionInfo))]
 [JsonSerializable(typeof(StartupProgressMessage))]

LanMountainDesktop.Launcher/Models/UpdateModels.cs

@@ -54,7 +54,7 @@ internal sealed class UpdateApplyResult
     public string? RolledBackTo { get; init; }
 }
 
-internal sealed class PdcUpdateMetadata
+internal sealed class PlondsUpdateMetadata
 {
     public string? DistributionId { get; set; }
 
@@ -73,7 +73,7 @@ internal sealed class PdcUpdateMetadata
     public Dictionary<string, string> Metadata { get; set; } = [];
 }
 
-internal sealed class PdcFileMap
+internal sealed class PlondsFileMap
 {
     public string? DistributionId { get; set; }
 
@@ -89,12 +89,12 @@ internal sealed class PdcFileMap
 
     public Dictionary<string, string> Metadata { get; set; } = [];
 
-    public List<PdcComponentEntry> Components { get; set; } = [];
+    public List<PlondsComponentEntry> Components { get; set; } = [];
 
-    public List<PdcFileEntry> Files { get; set; } = [];
+    public List<PlondsFileEntry> Files { get; set; } = [];
 }
 
-internal sealed class PdcComponentEntry
+internal sealed class PlondsComponentEntry
 {
     public string Name { get; set; } = string.Empty;
 
@@ -102,10 +102,10 @@ internal sealed class PdcComponentEntry
 
     public Dictionary<string, string> Metadata { get; set; } = [];
 
-    public List<PdcFileEntry> Files { get; set; } = [];
+    public List<PlondsFileEntry> Files { get; set; } = [];
 }
 
-internal sealed class PdcFileEntry
+internal sealed class PlondsFileEntry
 {
     public string Path { get; set; } = string.Empty;
 
@@ -129,12 +129,12 @@ internal sealed class PdcFileEntry
 
     public byte[]? Sha512Bytes { get; set; }
 
-    public PdcHashDescriptor? Hash { get; set; }
+    public PlondsHashDescriptor? Hash { get; set; }
 
     public Dictionary<string, string> Metadata { get; set; } = [];
 }
 
-internal sealed class PdcHashDescriptor
+internal sealed class PlondsHashDescriptor
 {
     public string? Algorithm { get; set; }
 

LanMountainDesktop.Launcher/Services/UpdateEngineService.cs

@@ -14,10 +14,10 @@ internal sealed class UpdateEngineService
     private const string SignedFileMapName = "files.json";
     private const string SignatureFileName = "files.json.sig";
     private const string ArchiveFileName = "update.zip";
-    private const string PdcFileMapName = "pdc-filemap.json";
-    private const string PdcSignatureFileName = "pdc-filemap.sig";
-    private const string PdcUpdateMetadataName = "pdc-update.json";
-    private const string PdcObjectsDirectoryName = "objects";
+    private const string PlondsFileMapName = "plonds-filemap.json";
+    private const string PlondsSignatureFileName = "plonds-filemap.sig";
+    private const string PlondsUpdateMetadataName = "plonds-update.json";
+    private const string PlondsObjectsDirectoryName = "objects";
     private const string PublicKeyFileName = "public-key.pem";
 
     private readonly DeploymentLocator _deploymentLocator;
@@ -37,33 +37,33 @@ internal sealed class UpdateEngineService
 
     public LauncherResult CheckPendingUpdate()
     {
-        var pdcFileMapPath = Path.Combine(_incomingRoot, PdcFileMapName);
-        var pdcSignaturePath = Path.Combine(_incomingRoot, PdcSignatureFileName);
-        var pdcUpdatePath = Path.Combine(_incomingRoot, PdcUpdateMetadataName);
+        var pdcFileMapPath = Path.Combine(_incomingRoot, PlondsFileMapName);
+        var pdcSignaturePath = Path.Combine(_incomingRoot, PlondsSignatureFileName);
+        var pdcUpdatePath = Path.Combine(_incomingRoot, PlondsUpdateMetadataName);
         if (File.Exists(pdcFileMapPath) && File.Exists(pdcSignaturePath))
         {
             var pdcFileMapText = File.ReadAllText(pdcFileMapPath);
-            var pdcFileMap = JsonSerializer.Deserialize(pdcFileMapText, AppJsonContext.Default.PdcFileMap);
+            var pdcFileMap = JsonSerializer.Deserialize(pdcFileMapText, AppJsonContext.Default.PlondsFileMap);
             if (pdcFileMap is null)
             {
-                return Failed("update.check", "invalid_manifest", "pdc-filemap.json is invalid.");
+                return Failed("update.check", "invalid_manifest", "plonds-filemap.json is invalid.");
             }
 
-            var pdcVerified = VerifySignature(pdcFileMapPath, pdcSignaturePath, PdcSignatureFileName);
+            var pdcVerified = VerifySignature(pdcFileMapPath, pdcSignaturePath, PlondsSignatureFileName);
             if (!pdcVerified.Success)
             {
                 return Failed("update.check", "signature_failed", pdcVerified.Message);
             }
 
-            var pdcMetadata = LoadPdcUpdateMetadata(pdcUpdatePath);
+            var pdcMetadata = LoadPlondsUpdateMetadata(pdcUpdatePath);
             return new LauncherResult
             {
                 Success = true,
                 Stage = "update.check",
                 Code = "available",
-                Message = "Pending PDC update is available.",
+                Message = "Pending PLONDS update is available.",
                 CurrentVersion = _deploymentLocator.GetCurrentVersion(),
-                TargetVersion = ResolvePdcTargetVersion(pdcFileMap, pdcMetadata)
+                TargetVersion = ResolvePlondsTargetVersion(pdcFileMap, pdcMetadata)
             };
         }
 
@@ -126,12 +126,12 @@ internal sealed class UpdateEngineService
         Directory.CreateDirectory(_incomingRoot);
         Directory.CreateDirectory(_snapshotsRoot);
 
-        var pdcFileMapPath = Path.Combine(_incomingRoot, PdcFileMapName);
-        var pdcSignaturePath = Path.Combine(_incomingRoot, PdcSignatureFileName);
-        var pdcUpdatePath = Path.Combine(_incomingRoot, PdcUpdateMetadataName);
+        var pdcFileMapPath = Path.Combine(_incomingRoot, PlondsFileMapName);
+        var pdcSignaturePath = Path.Combine(_incomingRoot, PlondsSignatureFileName);
+        var pdcUpdatePath = Path.Combine(_incomingRoot, PlondsUpdateMetadataName);
         if (File.Exists(pdcFileMapPath) && File.Exists(pdcSignaturePath))
         {
-            return await ApplyPendingPdcUpdateAsync(pdcFileMapPath, pdcSignaturePath, pdcUpdatePath);
+            return await ApplyPendingPlondsUpdateAsync(pdcFileMapPath, pdcSignaturePath, pdcUpdatePath);
         }
 
         var fileMapPath = Path.Combine(_incomingRoot, SignedFileMapName);
@@ -165,9 +165,7 @@ internal sealed class UpdateEngineService
         var currentDeployment = _deploymentLocator.FindCurrentDeploymentDirectory();
         if (string.IsNullOrWhiteSpace(currentDeployment))
         {
-            // 全新安装场景：没有当前部署目录，但有更新包
-            // 这种情况下应该直接应用更新作为首次安装
-            return await ApplyInitialDeploymentAsync(fileMap, archivePath, fileMapPath, signaturePath);
+            // Initial install path: no current deployment exists, so apply the staged package directly.
         }
 
         var currentVersion = _deploymentLocator.GetCurrentVersion();
@@ -236,7 +234,7 @@ internal sealed class UpdateEngineService
             snapshot.Status = "applied";
             SaveSnapshot(snapshotPath, snapshot);
             CleanupIncomingArtifacts();
-            // 清理旧版本，但保留最近3个版本以支持回滚
+            // 婵炴挸鎳愰幃濠囧籍瑜忔晶妤呭嫉椤掑﹦绀夊ù锝呮缁绘岸鎮惧▎鎰粯閺?濞戞搩浜炴晶妤呭嫉椤戝じ绨伴柡鈧娑樼槷闁搞儳鍋炵划?
             CleanupDestroyedDeployments();
 
             return new LauncherResult
@@ -280,46 +278,46 @@ internal sealed class UpdateEngineService
         }
     }
 
-    private async Task<LauncherResult> ApplyPendingPdcUpdateAsync(
+    private async Task<LauncherResult> ApplyPendingPlondsUpdateAsync(
         string pdcFileMapPath,
         string pdcSignaturePath,
         string pdcUpdatePath)
     {
-        var verifyResult = VerifySignature(pdcFileMapPath, pdcSignaturePath, PdcSignatureFileName);
+        var verifyResult = VerifySignature(pdcFileMapPath, pdcSignaturePath, PlondsSignatureFileName);
         if (!verifyResult.Success)
         {
             return Failed("update.apply", "signature_failed", verifyResult.Message);
         }
 
         var fileMapText = await File.ReadAllTextAsync(pdcFileMapPath).ConfigureAwait(false);
-        var fileMap = JsonSerializer.Deserialize(fileMapText, AppJsonContext.Default.PdcFileMap) ?? new PdcFileMap();
-        var fileEntries = CollectPdcFileEntries(fileMap);
+        var fileMap = JsonSerializer.Deserialize(fileMapText, AppJsonContext.Default.PlondsFileMap) ?? new PlondsFileMap();
+        var fileEntries = CollectPlondsFileEntries(fileMap);
         if (fileEntries.Count == 0)
         {
-            PopulatePdcManifestFromRawJson(fileMapText, fileMap, fileEntries);
+            PopulatePlondsManifestFromRawJson(fileMapText, fileMap, fileEntries);
         }
 
         if (fileEntries.Count == 0)
         {
-            return Failed("update.apply", "invalid_manifest", "No PDC file entries were found.");
+            return Failed("update.apply", "invalid_manifest", "No PLONDS file entries were found.");
         }
 
-        var pdcMetadata = LoadPdcUpdateMetadata(pdcUpdatePath);
+        var pdcMetadata = LoadPlondsUpdateMetadata(pdcUpdatePath);
 
         var currentDeployment = _deploymentLocator.FindCurrentDeploymentDirectory();
         var currentVersion = _deploymentLocator.GetCurrentVersion();
         var sourceVersion = string.IsNullOrWhiteSpace(currentVersion) ? "0.0.0" : currentVersion;
-        var expectedSourceVersion = ResolvePdcSourceVersion(fileMap, pdcMetadata);
+        var expectedSourceVersion = ResolvePlondsSourceVersion(fileMap, pdcMetadata);
         if (!string.IsNullOrWhiteSpace(expectedSourceVersion) &&
             !string.Equals(expectedSourceVersion, sourceVersion, StringComparison.OrdinalIgnoreCase))
         {
             return Failed(
                 "update.apply",
                 "version_mismatch",
-                $"PDC update requires source version {expectedSourceVersion} but current is {sourceVersion}.");
+                $"PLONDS update requires source version {expectedSourceVersion} but current is {sourceVersion}.");
         }
 
-        var targetVersion = ResolvePdcTargetVersion(fileMap, pdcMetadata);
+        var targetVersion = ResolvePlondsTargetVersion(fileMap, pdcMetadata);
         if (string.IsNullOrWhiteSpace(targetVersion))
         {
             targetVersion = sourceVersion;
@@ -354,12 +352,12 @@ internal sealed class UpdateEngineService
 
             foreach (var entry in fileEntries)
             {
-                ApplyPdcFileEntry(entry, currentDeployment, targetDeployment);
+                ApplyPlondsFileEntry(entry, currentDeployment, targetDeployment);
             }
 
             foreach (var entry in fileEntries)
             {
-                VerifyPdcFileEntry(entry, targetDeployment);
+                VerifyPlondsFileEntry(entry, targetDeployment);
             }
 
             if (isInitialDeployment)
@@ -412,7 +410,7 @@ internal sealed class UpdateEngineService
                     Success = false,
                     Stage = "update.apply",
                     Code = "initial_deploy_failed",
-                    Message = "Failed to apply initial PDC deployment.",
+                    Message = "Failed to apply initial PLONDS deployment.",
                     ErrorMessage = ex.Message,
                     CurrentVersion = "0.0.0",
                     TargetVersion = targetVersion
@@ -427,7 +425,7 @@ internal sealed class UpdateEngineService
                 Success = false,
                 Stage = "update.apply",
                 Code = "apply_failed",
-                Message = "Failed to apply PDC update. Rolled back to previous version.",
+                Message = "Failed to apply PLONDS update. Rolled back to previous version.",
                 ErrorMessage = ex.Message,
                 CurrentVersion = sourceVersion,
                 RolledBackTo = sourceVersion
@@ -435,7 +433,7 @@ internal sealed class UpdateEngineService
         }
     }
 
-    private void ApplyPdcFileEntry(PdcFileEntry file, string? currentDeployment, string targetDeployment)
+    private void ApplyPlondsFileEntry(PlondsFileEntry file, string? currentDeployment, string targetDeployment)
     {
         var normalizedPath = NormalizeRelativePath(file.Path);
         var action = string.IsNullOrWhiteSpace(file.Action) ? "replace" : file.Action!;
@@ -470,13 +468,13 @@ internal sealed class UpdateEngineService
             return;
         }
 
-        var objectPath = ResolvePdcObjectPath(file);
+        var objectPath = ResolvePlondsObjectPath(file);
         var objectBytes = File.ReadAllBytes(objectPath);
         var restoredBytes = TryInflateGzip(objectBytes) ?? objectBytes;
         File.WriteAllBytes(targetPath, restoredBytes);
     }
 
-    private void VerifyPdcFileEntry(PdcFileEntry file, string targetDeployment)
+    private void VerifyPlondsFileEntry(PlondsFileEntry file, string targetDeployment)
     {
         var action = string.IsNullOrWhiteSpace(file.Action) ? "replace" : file.Action!;
         if (string.Equals(action, "delete", StringComparison.OrdinalIgnoreCase))
@@ -512,26 +510,26 @@ internal sealed class UpdateEngineService
         }
     }
 
-    private string ResolvePdcObjectPath(PdcFileEntry file)
+    private string ResolvePlondsObjectPath(PlondsFileEntry file)
     {
         var candidates = new List<string>();
-        AddPdcPathCandidates(candidates, file.ObjectPath);
-        AddPdcPathCandidates(candidates, file.ObjectKey);
-        AddPdcPathCandidates(candidates, file.ArchivePath);
-        AddPdcPathCandidates(candidates, file.ObjectUrl);
-        AddPdcPathCandidates(candidates, file.Url);
+        AddPlondsPathCandidates(candidates, file.ObjectPath);
+        AddPlondsPathCandidates(candidates, file.ObjectKey);
+        AddPlondsPathCandidates(candidates, file.ArchivePath);
+        AddPlondsPathCandidates(candidates, file.ObjectUrl);
+        AddPlondsPathCandidates(candidates, file.Url);
 
         if (TryGetExpectedObjectSha512(file, out var expectedSha512) || TryGetExpectedSha512(file, out expectedSha512))
         {
             var hashHex = Convert.ToHexString(expectedSha512).ToLowerInvariant();
-            AddPdcPathCandidates(candidates, Path.Combine(PdcObjectsDirectoryName, hashHex));
+            AddPlondsPathCandidates(candidates, Path.Combine(PlondsObjectsDirectoryName, hashHex));
             if (hashHex.Length > 2)
             {
-                AddPdcPathCandidates(candidates, Path.Combine(PdcObjectsDirectoryName, hashHex[..2], hashHex));
+                AddPlondsPathCandidates(candidates, Path.Combine(PlondsObjectsDirectoryName, hashHex[..2], hashHex));
                 // Backward compatibility for previously staged paths.
-                AddPdcPathCandidates(candidates, Path.Combine(PdcObjectsDirectoryName, hashHex[..2], hashHex[2..]));
+                AddPlondsPathCandidates(candidates, Path.Combine(PlondsObjectsDirectoryName, hashHex[..2], hashHex[2..]));
             }
-            AddPdcPathCandidates(candidates, Path.Combine(PdcObjectsDirectoryName, $"{hashHex}.gz"));
+            AddPlondsPathCandidates(candidates, Path.Combine(PlondsObjectsDirectoryName, $"{hashHex}.gz"));
         }
 
         foreach (var relativePath in candidates.Distinct(StringComparer.OrdinalIgnoreCase))
@@ -567,7 +565,7 @@ internal sealed class UpdateEngineService
         }
     }
 
-    private void AddPdcPathCandidates(ICollection<string> candidates, string? value)
+    private void AddPlondsPathCandidates(ICollection<string> candidates, string? value)
     {
         if (string.IsNullOrWhiteSpace(value))
         {
@@ -589,19 +587,19 @@ internal sealed class UpdateEngineService
         normalized = normalized.Replace('/', Path.DirectorySeparatorChar).Replace('\\', Path.DirectorySeparatorChar);
         candidates.Add(normalized);
 
-        if (!normalized.StartsWith($"{PdcObjectsDirectoryName}{Path.DirectorySeparatorChar}", StringComparison.OrdinalIgnoreCase))
+        if (!normalized.StartsWith($"{PlondsObjectsDirectoryName}{Path.DirectorySeparatorChar}", StringComparison.OrdinalIgnoreCase))
         {
-            candidates.Add(Path.Combine(PdcObjectsDirectoryName, normalized));
+            candidates.Add(Path.Combine(PlondsObjectsDirectoryName, normalized));
         }
 
         var fileName = Path.GetFileName(normalized);
         if (!string.IsNullOrWhiteSpace(fileName))
         {
-            candidates.Add(Path.Combine(PdcObjectsDirectoryName, fileName));
+            candidates.Add(Path.Combine(PlondsObjectsDirectoryName, fileName));
         }
     }
 
-    private static bool TryGetExpectedSha512(PdcFileEntry file, out byte[] expected)
+    private static bool TryGetExpectedSha512(PlondsFileEntry file, out byte[] expected)
     {
         expected = [];
         if (file.Sha512Bytes is { Length: > 0 })
@@ -636,7 +634,7 @@ internal sealed class UpdateEngineService
         return TryParseHashBytes(file.Sha512Base64, out expected);
     }
 
-    private static bool TryGetExpectedObjectSha512(PdcFileEntry file, out byte[] expected)
+    private static bool TryGetExpectedObjectSha512(PlondsFileEntry file, out byte[] expected)
     {
         expected = [];
         if (file.Hash is null)
@@ -724,9 +722,9 @@ internal sealed class UpdateEngineService
         return normalized.Replace("-", string.Empty).Trim().ToLowerInvariant();
     }
 
-    private static List<PdcFileEntry> CollectPdcFileEntries(PdcFileMap fileMap)
+    private static List<PlondsFileEntry> CollectPlondsFileEntries(PlondsFileMap fileMap)
     {
-        var files = new List<PdcFileEntry>();
+        var files = new List<PlondsFileEntry>();
         if (fileMap.Files is { Count: > 0 })
         {
             files.AddRange(fileMap.Files);
@@ -748,7 +746,7 @@ internal sealed class UpdateEngineService
         return files;
     }
 
-    private static void PopulatePdcManifestFromRawJson(string fileMapJson, PdcFileMap fileMap, ICollection<PdcFileEntry> files)
+    private static void PopulatePlondsManifestFromRawJson(string fileMapJson, PlondsFileMap fileMap, ICollection<PlondsFileEntry> files)
     {
         if (string.IsNullOrWhiteSpace(fileMapJson))
         {
@@ -794,7 +792,7 @@ internal sealed class UpdateEngineService
 
         if (TryGetJsonPropertyIgnoreCase(root, "files", out var rootFilesNode))
         {
-            ParsePdcFilesNode(rootFilesNode, null, files);
+            ParsePlondsFilesNode(rootFilesNode, null, files);
         }
 
         if (!TryGetJsonPropertyIgnoreCase(root, "components", out var componentsNode))
@@ -813,7 +811,7 @@ internal sealed class UpdateEngineService
 
                 if (TryGetJsonPropertyIgnoreCase(component.Value, "files", out var componentFilesNode))
                 {
-                    ParsePdcFilesNode(componentFilesNode, component.Name, files);
+                    ParsePlondsFilesNode(componentFilesNode, component.Name, files);
                 }
             }
 
@@ -835,12 +833,12 @@ internal sealed class UpdateEngineService
             var componentName = ReadJsonStringIgnoreCase(component, "name");
             if (TryGetJsonPropertyIgnoreCase(component, "files", out var componentFilesNode))
             {
-                ParsePdcFilesNode(componentFilesNode, componentName, files);
+                ParsePlondsFilesNode(componentFilesNode, componentName, files);
             }
         }
     }
 
-    private static void ParsePdcFilesNode(JsonElement filesNode, string? componentName, ICollection<PdcFileEntry> files)
+    private static void ParsePlondsFilesNode(JsonElement filesNode, string? componentName, ICollection<PlondsFileEntry> files)
     {
         if (filesNode.ValueKind == JsonValueKind.Object)
         {
@@ -851,7 +849,7 @@ internal sealed class UpdateEngineService
                     continue;
                 }
 
-                if (TryCreatePdcFileEntry(fileEntry.Name, componentName, fileEntry.Value, out var parsed))
+                if (TryCreatePlondsFileEntry(fileEntry.Name, componentName, fileEntry.Value, out var parsed))
                 {
                     files.Add(parsed);
                 }
@@ -873,16 +871,16 @@ internal sealed class UpdateEngineService
             }
 
             var fallbackPath = ReadJsonStringIgnoreCase(fileEntry, "path");
-            if (TryCreatePdcFileEntry(fallbackPath, componentName, fileEntry, out var parsed))
+            if (TryCreatePlondsFileEntry(fallbackPath, componentName, fileEntry, out var parsed))
             {
                 files.Add(parsed);
             }
         }
     }
 
-    private static bool TryCreatePdcFileEntry(string? fallbackPath, string? componentName, JsonElement node, out PdcFileEntry entry)
+    private static bool TryCreatePlondsFileEntry(string? fallbackPath, string? componentName, JsonElement node, out PlondsFileEntry entry)
     {
-        entry = new PdcFileEntry();
+        entry = new PlondsFileEntry();
         var path = ReadJsonStringIgnoreCase(node, "path");
         if (string.IsNullOrWhiteSpace(path))
         {
@@ -916,7 +914,7 @@ internal sealed class UpdateEngineService
             metadata["component"] = componentName;
         }
 
-        entry = new PdcFileEntry
+        entry = new PlondsFileEntry
         {
             Path = path,
             Action = string.IsNullOrWhiteSpace(action) ? "replace" : action,
@@ -934,7 +932,7 @@ internal sealed class UpdateEngineService
 
         if (archiveSha512 is { Length: > 0 } || !string.IsNullOrWhiteSpace(archiveSha512Text))
         {
-            entry.Hash = new PdcHashDescriptor
+            entry.Hash = new PlondsHashDescriptor
             {
                 Algorithm = "sha512",
                 Bytes = archiveSha512,
@@ -945,7 +943,7 @@ internal sealed class UpdateEngineService
         }
         else if (TryGetJsonPropertyIgnoreCase(node, "hash", out var hashNode) && hashNode.ValueKind == JsonValueKind.Object)
         {
-            entry.Hash = new PdcHashDescriptor
+            entry.Hash = new PlondsHashDescriptor
             {
                 Algorithm = ReadJsonStringIgnoreCase(hashNode, "algorithm"),
                 Value = ReadJsonStringIgnoreCase(hashNode, "value"),
@@ -1028,7 +1026,7 @@ internal sealed class UpdateEngineService
         }
     }
 
-    private static PdcUpdateMetadata? LoadPdcUpdateMetadata(string path)
+    private static PlondsUpdateMetadata? LoadPlondsUpdateMetadata(string path)
     {
         if (!File.Exists(path))
         {
@@ -1043,7 +1041,7 @@ internal sealed class UpdateEngineService
                 return null;
             }
 
-            return JsonSerializer.Deserialize(text, AppJsonContext.Default.PdcUpdateMetadata);
+            return JsonSerializer.Deserialize(text, AppJsonContext.Default.PlondsUpdateMetadata);
         }
         catch
         {
@@ -1051,7 +1049,7 @@ internal sealed class UpdateEngineService
         }
     }
 
-    private static string? ResolvePdcSourceVersion(PdcFileMap fileMap, PdcUpdateMetadata? metadata)
+    private static string? ResolvePlondsSourceVersion(PlondsFileMap fileMap, PlondsUpdateMetadata? metadata)
     {
         return FirstNonEmpty(
             metadata?.FromVersion,
@@ -1060,7 +1058,7 @@ internal sealed class UpdateEngineService
             TryGetMetadataValue(fileMap.Metadata, "sourceVersion"));
     }
 
-    private static string? ResolvePdcTargetVersion(PdcFileMap fileMap, PdcUpdateMetadata? metadata)
+    private static string? ResolvePlondsTargetVersion(PlondsFileMap fileMap, PlondsUpdateMetadata? metadata)
     {
         return FirstNonEmpty(
             metadata?.ToVersion,
@@ -1107,7 +1105,7 @@ internal sealed class UpdateEngineService
     }
 
     /// <summary>
-    /// 全新安装场景：直接应用更新包作为首次部署
+    /// 闁稿繈鍔嶉弻濠勨偓鐟邦槼椤ュ﹪宕烽悜妯荤彲闁挎稒姘ㄥú鍧楀箳閵夈儳瀹夐柣顫妽濞插潡寮弶鍨樁濞达絾绮堢拹鐔革純閺嶎煈鍋ч梺顔哄妿鐠?
     /// </summary>
     private async Task<LauncherResult> ApplyInitialDeploymentAsync(
         SignedFileMap fileMap,
@@ -1123,7 +1121,7 @@ internal sealed class UpdateEngineService
         var extractRoot = Path.Combine(_incomingRoot, "extracted");
         try
         {
-            // 保存快照（用于回滚，虽然首次安装回滚意义不大）
+            // Save a snapshot for diagnostics and future rollback consistency.
             var snapshot = new SnapshotMetadata
             {
                 SnapshotId = Guid.NewGuid().ToString("N"),
@@ -1136,7 +1134,7 @@ internal sealed class UpdateEngineService
             };
             SaveSnapshot(snapshotPath, snapshot);
 
-            // 清理并解压更新包
+            // 婵炴挸鎳愰幃濠囩嵁閹澏鎺楀储鐎ｎ偅绾柡鍌涙緲鐎?
             if (Directory.Exists(extractRoot))
             {
                 Directory.Delete(extractRoot, true);
@@ -1144,17 +1142,17 @@ internal sealed class UpdateEngineService
             Directory.CreateDirectory(extractRoot);
             ZipFile.ExtractToDirectory(archivePath, extractRoot, overwriteFiles: true);
 
-            // 创建目标部署目录
+            // 闁告帗绋戠紓鎾绘儎椤旂晫鍨奸梺顔哄妿鐠佹煡鎯勯鑲╃Э
             Directory.CreateDirectory(targetDeployment);
             File.WriteAllText(partialMarker, string.Empty);
 
-            // 应用所有文件（全新安装时，所有文件都是新增或替换）
+            // Apply all files from the extracted payload into the first deployment directory.
             foreach (var file in fileMap.Files)
             {
                 ApplyInitialFileEntry(file, targetDeployment, extractRoot);
             }
 
-            // 验证文件哈希
+            // 濡ょ姴鐭侀惁澶愬棘閸ワ附顐介柛婵嗙墕缁?
             foreach (var file in fileMap.Files)
             {
                 if (!NeedsVerification(file))
@@ -1170,7 +1168,7 @@ internal sealed class UpdateEngineService
                 }
             }
 
-            // 激活部署（创建 .current 标记，删除 .partial 标记）
+            // Mark the deployment as current and remove the partial marker.
             var currentMarker = Path.Combine(targetDeployment, ".current");
             File.WriteAllText(currentMarker, string.Empty);
             if (File.Exists(partialMarker))
@@ -1178,8 +1176,7 @@ internal sealed class UpdateEngineService
                 File.Delete(partialMarker);
             }
 
-            // 清理更新包
-            snapshot.Status = "applied";
+            // 婵炴挸鎳愰幃濠囧即鐎涙ɑ鐓€闁?            snapshot.Status = "applied";
             SaveSnapshot(snapshotPath, snapshot);
             CleanupIncomingArtifacts();
 
@@ -1195,7 +1192,7 @@ internal sealed class UpdateEngineService
         }
         catch (Exception ex)
         {
-            // 清理失败的目标目录
+            // Clean up the failed target deployment before returning the error result.
             try
             {
                 if (Directory.Exists(targetDeployment))
@@ -1234,13 +1231,12 @@ internal sealed class UpdateEngineService
     }
 
     /// <summary>
-    /// 应用初始部署文件（全新安装场景，不需要源目录）
-    /// </summary>
+    /// 閹煎瓨姊婚弫銈夊礆濠靛棭娼楅梺顔哄妿鐠佹煡寮崶锔筋偨闁挎稑鐗嗛崣蹇涘棘閺夎法鏆旈悷浣告噹濠р偓闁哄拋鍨界槐婵囩▔瀹ュ浠橀悷鏇氱劍缁噣鎯勯鑲╃Э闁?    /// </summary>
     private void ApplyInitialFileEntry(UpdateFileEntry file, string targetDeployment, string extractRoot)
     {
         var normalizedPath = NormalizeRelativePath(file.Path);
 
-        // 删除操作在全新安装时忽略
+        // 闁告帞濞€濞呭酣骞欏鍕▕闁革负鍔岄崣蹇涘棘閺夎法鏆旈悷浣告噺濡炲倽绠涢悾灞炬
         if (string.Equals(file.Action, "delete", StringComparison.OrdinalIgnoreCase))
         {
             return;
@@ -1254,7 +1250,7 @@ internal sealed class UpdateEngineService
             Directory.CreateDirectory(targetDir);
         }
 
-        // 无论是 add 还是 replace，都从压缩包复制
+        // 闁哄啰濮鹃鎴﹀及?add 閺夆晜蓱濡?replace闁挎稑鐭傞崗妯荤鎼粹€崇缂傚倵鏅涚€垫ɑ寰勫鍛厬
         var archiveRelative = string.IsNullOrWhiteSpace(file.ArchivePath) ? normalizedPath : NormalizeRelativePath(file.ArchivePath);
         var extractedPath = Path.Combine(extractRoot, archiveRelative);
         EnsurePathWithinRoot(extractedPath, extractRoot);
@@ -1419,9 +1415,9 @@ internal sealed class UpdateEngineService
                      Path.Combine(_incomingRoot, SignedFileMapName),
                      Path.Combine(_incomingRoot, SignatureFileName),
                      Path.Combine(_incomingRoot, ArchiveFileName),
-                     Path.Combine(_incomingRoot, PdcFileMapName),
-                     Path.Combine(_incomingRoot, PdcSignatureFileName),
-                     Path.Combine(_incomingRoot, PdcUpdateMetadataName)
+                     Path.Combine(_incomingRoot, PlondsFileMapName),
+                     Path.Combine(_incomingRoot, PlondsSignatureFileName),
+                     Path.Combine(_incomingRoot, PlondsUpdateMetadataName)
                  })
         {
             try
@@ -1438,7 +1434,7 @@ internal sealed class UpdateEngineService
 
         foreach (var directory in new[]
                  {
-                     Path.Combine(_incomingRoot, PdcObjectsDirectoryName)
+                     Path.Combine(_incomingRoot, PlondsObjectsDirectoryName)
                  })
         {
             try

LanMountainDesktop/Services/GitHubReleaseUpdateService.cs

@@ -35,9 +35,9 @@ public sealed record UpdateCheckResult(
     GitHubReleaseAsset? PreferredAsset,
     string? ErrorMessage,
     bool ForceMode = false,
-    PdcUpdatePayload? PdcPayload = null);
+    PlondsUpdatePayload? PlondsPayload = null);
 
-public sealed record PdcUpdatePayload(
+public sealed record PlondsUpdatePayload(
     string DistributionId,
     string ChannelId,
     string SubChannel,

LanMountainDesktop/Services/PlondsReleaseUpdateService.cs

@@ -11,15 +11,17 @@ 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.
+/// Thin PLONDS client used by the host app.
+/// The host keeps responsibility for checking and downloading updates; Launcher only applies staged payloads.
 /// </summary>
-public sealed class PdcReleaseUpdateService : IDisposable
+public sealed class PlondsReleaseUpdateService : IDisposable
 {
+    private const string DefaultApiBasePath = "/api/plonds/v1";
+
     private readonly HttpClient _httpClient;
     private readonly bool _ownsHttpClient;
 
-    public PdcReleaseUpdateService(HttpClient? httpClient = null)
+    public PlondsReleaseUpdateService(HttpClient? httpClient = null)
     {
         if (httpClient is null)
         {
@@ -79,25 +81,40 @@ public sealed class PdcReleaseUpdateService : IDisposable
                 LatestVersionText: "-",
                 Release: null,
                 PreferredAsset: null,
-                ErrorMessage: "PDC endpoint is not configured.",
+                ErrorMessage: "PLONDS 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 apiBasePath = ResolveApiBasePath();
+            var metadataUrl = BuildApiUrl(endpoint, apiBasePath, "metadata");
+            var metadata = await GetJsonNodeAsync(metadataUrl, cancellationToken).ConfigureAwait(false);
 
-            var channelId = ResolveChannelId(metadata, includePrerelease);
-            if (string.IsNullOrWhiteSpace(channelId))
-            {
-                channelId = includePrerelease ? "preview" : "stable";
-            }
-
-            var latestUrl = BuildUri(
+            var channelId = ResolveChannelId(includePrerelease);
+            var platform = ResolvePlatform();
+            var latestUrl = BuildApiUrl(
                 endpoint,
-                $"api/v1/public/distributions/latest/{Uri.EscapeDataString(channelId)}?appVersion={Uri.EscapeDataString(normalizedCurrentVersionText)}");
-            var latestNode = await GetContentNodeAsync(latestUrl, cancellationToken).ConfigureAwait(false);
+                apiBasePath,
+                $"channels/{Uri.EscapeDataString(channelId)}/{Uri.EscapeDataString(platform)}/latest?currentVersion={Uri.EscapeDataString(normalizedCurrentVersionText)}");
+
+            JsonElement latestNode;
+            try
+            {
+                latestNode = await GetJsonNodeAsync(latestUrl, cancellationToken).ConfigureAwait(false);
+            }
+            catch (InvalidOperationException ex) when (ex.Message.StartsWith("HTTP 204", StringComparison.OrdinalIgnoreCase))
+            {
+                return new UpdateCheckResult(
+                    Success: true,
+                    IsUpdateAvailable: false,
+                    CurrentVersionText: normalizedCurrentVersionText,
+                    LatestVersionText: normalizedCurrentVersionText,
+                    Release: null,
+                    PreferredAsset: null,
+                    ErrorMessage: null,
+                    ForceMode: isForce);
+            }
 
             var latestVersionText = ReadString(latestNode, "version") ?? "-";
             if (!TryParseVersion(latestVersionText, out var latestVersion) || latestVersion is null)
@@ -109,7 +126,7 @@ public sealed class PdcReleaseUpdateService : IDisposable
                     LatestVersionText: latestVersionText,
                     Release: null,
                     PreferredAsset: null,
-                    ErrorMessage: "PDC latest distribution version is invalid.",
+                    ErrorMessage: "PLONDS latest distribution version is invalid.",
                     ForceMode: isForce);
             }
 
@@ -123,7 +140,7 @@ public sealed class PdcReleaseUpdateService : IDisposable
                     LatestVersionText: latestVersionText,
                     Release: null,
                     PreferredAsset: null,
-                    ErrorMessage: "PDC latest distribution id is missing.",
+                    ErrorMessage: "PLONDS latest distribution id is missing.",
                     ForceMode: isForce);
             }
 
@@ -141,15 +158,15 @@ public sealed class PdcReleaseUpdateService : IDisposable
                     ForceMode: false);
             }
 
-            var subChannel = ResolveSubChannel();
-            var distributionUrl = BuildUri(
+            var distributionUrl = BuildApiUrl(
                 endpoint,
-                $"api/v1/public/distributions/{Uri.EscapeDataString(distributionId)}/{Uri.EscapeDataString(subChannel)}");
-            var distributionNode = await GetContentNodeAsync(distributionUrl, cancellationToken).ConfigureAwait(false);
+                apiBasePath,
+                $"distributions/{Uri.EscapeDataString(distributionId)}");
+            var distributionNode = await GetJsonNodeAsync(distributionUrl, cancellationToken).ConfigureAwait(false);
 
-            var assets = ResolveAssets(distributionNode);
-            var pdcPayload = ResolvePdcPayload(distributionNode, distributionId, channelId, subChannel);
-            if (assets.Count == 0 && !HasPdcPayload(pdcPayload))
+            var assets = ResolveInstallerAssets(distributionNode);
+            var payload = ResolvePlondsPayload(distributionNode, distributionId, channelId, platform);
+            if (assets.Count == 0 && !HasPlondsPayload(payload))
             {
                 return new UpdateCheckResult(
                     Success: false,
@@ -158,18 +175,18 @@ public sealed class PdcReleaseUpdateService : IDisposable
                     LatestVersionText: latestVersionText,
                     Release: null,
                     PreferredAsset: null,
-                    ErrorMessage: "PDC distribution response does not expose downloadable update assets.",
+                    ErrorMessage: "PLONDS distribution response does not expose downloadable update assets.",
                     ForceMode: isForce);
             }
 
+            var publishedAt = ParsePublishedAt(distributionNode) ?? DateTimeOffset.UtcNow;
             var release = new GitHubReleaseInfo(
                 TagName: $"v{latestVersionText}",
-                Name: $"PDC Distribution {latestVersionText}",
+                Name: $"PLONDS Distribution {latestVersionText}",
                 IsPrerelease: includePrerelease,
                 IsDraft: false,
-                PublishedAt: DateTimeOffset.UtcNow,
+                PublishedAt: publishedAt,
                 Assets: assets);
-            var preferredAsset = SelectPreferredInstallerAsset(assets);
 
             return new UpdateCheckResult(
                 Success: true,
@@ -177,10 +194,10 @@ public sealed class PdcReleaseUpdateService : IDisposable
                 CurrentVersionText: normalizedCurrentVersionText,
                 LatestVersionText: latestVersionText,
                 Release: release,
-                PreferredAsset: preferredAsset,
+                PreferredAsset: SelectPreferredInstallerAsset(assets),
                 ErrorMessage: null,
                 ForceMode: isForce,
-                PdcPayload: pdcPayload);
+                PlondsPayload: payload);
         }
         catch (OperationCanceledException)
         {
@@ -195,12 +212,12 @@ public sealed class PdcReleaseUpdateService : IDisposable
                 LatestVersionText: "-",
                 Release: null,
                 PreferredAsset: null,
-                ErrorMessage: $"PDC request failed: {ex.Message}",
+                ErrorMessage: $"PLONDS request failed: {ex.Message}",
                 ForceMode: isForce);
         }
     }
 
-    private async Task<JsonElement> GetContentNodeAsync(string url, CancellationToken cancellationToken)
+    private async Task<JsonElement> GetJsonNodeAsync(string url, CancellationToken cancellationToken)
     {
         using var request = new HttpRequestMessage(HttpMethod.Get, url);
         var token = ResolveToken();
@@ -227,15 +244,39 @@ public sealed class PdcReleaseUpdateService : IDisposable
         return root.Clone();
     }
 
-    private static IReadOnlyList<GitHubReleaseAsset> ResolveAssets(JsonElement distributionNode)
+    private static IReadOnlyList<GitHubReleaseAsset> ResolveInstallerAssets(JsonElement distributionNode)
     {
         var assets = new List<GitHubReleaseAsset>();
-        if (distributionNode.ValueKind != JsonValueKind.Object)
+
+        if (TryGetPropertyIgnoreCase(distributionNode, "installerMirrors", out var installersNode) &&
+            installersNode.ValueKind == JsonValueKind.Array)
+        {
+            foreach (var installerNode in installersNode.EnumerateArray())
+            {
+                if (installerNode.ValueKind != JsonValueKind.Object)
+                {
+                    continue;
+                }
+
+                var name = ReadString(installerNode, "name");
+                var url = ReadString(installerNode, "url") ?? ReadString(installerNode, "downloadUrl");
+                if (string.IsNullOrWhiteSpace(name) || string.IsNullOrWhiteSpace(url))
+                {
+                    continue;
+                }
+
+                var size = ReadInt64(installerNode, "size") ?? 0L;
+                var sha256 = ReadString(installerNode, "sha256");
+                assets.Add(new GitHubReleaseAsset(name, url, size, sha256));
+            }
+        }
+
+        if (assets.Count > 0)
         {
             return assets;
         }
 
-        if (distributionNode.TryGetProperty("assets", out var assetsNode) &&
+        if (TryGetPropertyIgnoreCase(distributionNode, "assets", out var assetsNode) &&
             assetsNode.ValueKind == JsonValueKind.Array)
         {
             foreach (var assetNode in assetsNode.EnumerateArray())
@@ -246,9 +287,9 @@ public sealed class PdcReleaseUpdateService : IDisposable
                 }
 
                 var name = ReadString(assetNode, "name");
-                var url = ReadString(assetNode, "url") ??
-                          ReadString(assetNode, "downloadUrl") ??
-                          ReadString(assetNode, "browserDownloadUrl");
+                var url = ReadString(assetNode, "url")
+                          ?? ReadString(assetNode, "downloadUrl")
+                          ?? ReadString(assetNode, "browserDownloadUrl");
                 if (string.IsNullOrWhiteSpace(name) || string.IsNullOrWhiteSpace(url))
                 {
                     continue;
@@ -260,43 +301,14 @@ public sealed class PdcReleaseUpdateService : IDisposable
             }
         }
 
-        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 PdcUpdatePayload ResolvePdcPayload(
+    private static PlondsUpdatePayload ResolvePlondsPayload(
         JsonElement distributionNode,
         string distributionId,
         string channelId,
-        string subChannel)
+        string platform)
     {
         var fileMapJson = ReadString(distributionNode, "fileMapJson");
         var fileMapSignature = ReadString(distributionNode, "fileMapSignature");
@@ -305,17 +317,18 @@ public sealed class PdcReleaseUpdateService : IDisposable
                              ?? ReadString(distributionNode, "manifestUrl");
         var fileMapSignatureUrl = ReadString(distributionNode, "fileMapSignatureUrl")
                                   ?? ReadString(distributionNode, "signatureUrl");
-        return new PdcUpdatePayload(
+
+        return new PlondsUpdatePayload(
             DistributionId: distributionId,
             ChannelId: channelId,
-            SubChannel: subChannel,
+            SubChannel: platform,
             FileMapJson: fileMapJson,
             FileMapSignature: fileMapSignature,
             FileMapJsonUrl: fileMapJsonUrl,
             FileMapSignatureUrl: fileMapSignatureUrl);
     }
 
-    private static bool HasPdcPayload(PdcUpdatePayload payload)
+    private static bool HasPlondsPayload(PlondsUpdatePayload payload)
     {
         return !string.IsNullOrWhiteSpace(payload.FileMapJson)
                || !string.IsNullOrWhiteSpace(payload.FileMapJsonUrl);
@@ -336,6 +349,7 @@ public sealed class PdcReleaseUpdateService : IDisposable
                 Architecture.X86 => "x86",
                 _ => "x64"
             };
+
             return assets
                 .Select(asset => (Asset: asset, Score: ScoreInstallerAsset(asset.Name, ".exe", ".msi", archToken)))
                 .OrderByDescending(x => x.Score)
@@ -405,59 +419,15 @@ public sealed class PdcReleaseUpdateService : IDisposable
         return score;
     }
 
-    private static string ResolveChannelId(JsonElement metadataNode, bool includePrerelease)
+    private static string ResolveChannelId(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";
+        return includePrerelease
+            ? UpdateSettingsValues.ChannelPreview
+            : UpdateSettingsValues.ChannelStable;
     }
 
-    private static string ResolveSubChannel()
+    private static string ResolvePlatform()
     {
-        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()
@@ -474,43 +444,58 @@ public sealed class PdcReleaseUpdateService : IDisposable
             _ => "x64"
         };
 
-        return $"{os}_{arch}_release_folderClassic";
+        return $"{os}-{arch}";
     }
 
     private static string? ResolveEndpoint()
     {
-        var endpoint = Environment.GetEnvironmentVariable("LANMOUNTAIN_PDC_ENDPOINT")
-                      ?? Environment.GetEnvironmentVariable("PDC_ENDPOINT");
+        var endpoint = Environment.GetEnvironmentVariable("LANMOUNTAIN_PLONDS_ENDPOINT")
+                      ?? Environment.GetEnvironmentVariable("PLONDS_ENDPOINT");
         return string.IsNullOrWhiteSpace(endpoint) ? null : endpoint.Trim().TrimEnd('/');
     }
 
     private static string? ResolveToken()
     {
-        var token = Environment.GetEnvironmentVariable("LANMOUNTAIN_PDC_TOKEN")
-                    ?? Environment.GetEnvironmentVariable("PDC_TOKEN");
+        var token = Environment.GetEnvironmentVariable("LANMOUNTAIN_PLONDS_TOKEN")
+                    ?? Environment.GetEnvironmentVariable("PLONDS_TOKEN");
         return string.IsNullOrWhiteSpace(token) ? null : token.Trim();
     }
 
-    private static string BuildUri(string endpoint, string relativePath)
+    private static string ResolveApiBasePath()
     {
-        return $"{endpoint.TrimEnd('/')}/{relativePath.TrimStart('/')}";
+        var configured = Environment.GetEnvironmentVariable("LANMOUNTAIN_PLONDS_API_BASE_PATH")
+                         ?? Environment.GetEnvironmentVariable("PLONDS_API_BASE_PATH");
+        if (string.IsNullOrWhiteSpace(configured))
+        {
+            return DefaultApiBasePath;
+        }
+
+        var normalized = configured.Trim();
+        return normalized.StartsWith("/", StringComparison.Ordinal) ? normalized : "/" + normalized;
+    }
+
+    private static string BuildApiUrl(string endpoint, string apiBasePath, string relativePath)
+    {
+        return $"{endpoint.TrimEnd('/')}/{apiBasePath.Trim('/').TrimEnd('/')}/{relativePath.TrimStart('/')}";
     }
 
     private static string? ReadString(JsonElement node, string propertyName)
     {
-        if (node.ValueKind != JsonValueKind.Object || !node.TryGetProperty(propertyName, out var value))
+        if (!TryGetPropertyIgnoreCase(node, propertyName, out var value))
         {
             return null;
         }
 
         return value.ValueKind == JsonValueKind.String
             ? value.GetString()
-            : value.ToString();
+            : value.ValueKind is JsonValueKind.Null or JsonValueKind.Undefined
+                ? null
+                : value.ToString();
     }
 
     private static long? ReadInt64(JsonElement node, string propertyName)
     {
-        if (node.ValueKind != JsonValueKind.Object || !node.TryGetProperty(propertyName, out var value))
+        if (!TryGetPropertyIgnoreCase(node, propertyName, out var value))
         {
             return null;
         }
@@ -526,6 +511,37 @@ public sealed class PdcReleaseUpdateService : IDisposable
             : null;
     }
 
+    private static DateTimeOffset? ParsePublishedAt(JsonElement node)
+    {
+        var text = ReadString(node, "publishedAt");
+        if (string.IsNullOrWhiteSpace(text))
+        {
+            return null;
+        }
+
+        return DateTimeOffset.TryParse(text, CultureInfo.InvariantCulture, DateTimeStyles.AssumeUniversal, out var value)
+            ? value
+            : null;
+    }
+
+    private static bool TryGetPropertyIgnoreCase(JsonElement node, string propertyName, out JsonElement value)
+    {
+        if (node.ValueKind == JsonValueKind.Object)
+        {
+            foreach (var property in node.EnumerateObject())
+            {
+                if (string.Equals(property.Name, propertyName, StringComparison.OrdinalIgnoreCase))
+                {
+                    value = property.Value;
+                    return true;
+                }
+            }
+        }
+
+        value = default;
+        return false;
+    }
+
     private static bool TryParseVersion(string? value, out Version? version)
     {
         version = null;

LanMountainDesktop/Services/Settings/SettingsContracts.cs

@@ -356,7 +356,7 @@ public interface IUpdateSettingsService
     void Save(UpdateSettingsState state);
     Task<UpdateCheckResult> CheckForUpdatesAsync(Version currentVersion, bool includePrerelease, CancellationToken cancellationToken = default);
     Task<UpdateCheckResult> ForceCheckForUpdatesAsync(Version currentVersion, bool includePrerelease, CancellationToken cancellationToken = default);
-    Task<PdcUpdatePayload?> GetPdcUpdatePayloadAsync(Version currentVersion, bool includePrerelease, bool isForce = false, CancellationToken cancellationToken = default);
+    Task<PlondsUpdatePayload?> GetPlondsUpdatePayloadAsync(Version currentVersion, bool includePrerelease, bool isForce = false, CancellationToken cancellationToken = default);
     Task<UpdateDownloadResult> DownloadAssetAsync(
         GitHubReleaseAsset asset,
         string destinationFilePath,

LanMountainDesktop/Services/Settings/SettingsDomainServices.cs

@@ -752,7 +752,7 @@ internal sealed class UpdateSettingsService : IUpdateSettingsService, IDisposabl
 {
     private readonly ISettingsService _settingsService;
     private readonly GitHubReleaseUpdateService _githubReleaseUpdateService = new("wwiinnddyy", "LanMountainDesktop");
-    private readonly PdcReleaseUpdateService _pdcReleaseUpdateService = new();
+    private readonly PlondsReleaseUpdateService _plondsReleaseUpdateService = new();
 
     public UpdateSettingsService(ISettingsService settingsService)
     {
@@ -842,16 +842,16 @@ internal sealed class UpdateSettingsService : IUpdateSettingsService, IDisposabl
         return CheckForUpdatesCoreAsync(currentVersion, includePrerelease, isForce: true, cancellationToken);
     }
 
-    public async Task<PdcUpdatePayload?> GetPdcUpdatePayloadAsync(
+    public async Task<PlondsUpdatePayload?> GetPlondsUpdatePayloadAsync(
         Version currentVersion,
         bool includePrerelease,
         bool isForce = false,
         CancellationToken cancellationToken = default)
     {
         var result = isForce
-            ? await _pdcReleaseUpdateService.ForceCheckForUpdatesAsync(currentVersion, includePrerelease, cancellationToken)
-            : await _pdcReleaseUpdateService.CheckForUpdatesAsync(currentVersion, includePrerelease, cancellationToken);
-        return result.Success ? result.PdcPayload : null;
+            ? await _plondsReleaseUpdateService.ForceCheckForUpdatesAsync(currentVersion, includePrerelease, cancellationToken)
+            : await _plondsReleaseUpdateService.CheckForUpdatesAsync(currentVersion, includePrerelease, cancellationToken);
+        return result.Success ? result.PlondsPayload : null;
     }
 
     public Task<UpdateDownloadResult> DownloadAssetAsync(
@@ -891,7 +891,7 @@ internal sealed class UpdateSettingsService : IUpdateSettingsService, IDisposabl
     public void Dispose()
     {
         _githubReleaseUpdateService.Dispose();
-        _pdcReleaseUpdateService.Dispose();
+        _plondsReleaseUpdateService.Dispose();
     }
 
     private async Task<UpdateCheckResult> CheckForUpdatesCoreAsync(
@@ -901,20 +901,20 @@ internal sealed class UpdateSettingsService : IUpdateSettingsService, IDisposabl
         CancellationToken cancellationToken)
     {
         var source = UpdateSettingsValues.NormalizeDownloadSource(_settingsService.Load().UpdateDownloadSource);
-        if (string.Equals(source, UpdateSettingsValues.DownloadSourcePdc, StringComparison.OrdinalIgnoreCase))
+        if (string.Equals(source, UpdateSettingsValues.DownloadSourcePlonds, StringComparison.OrdinalIgnoreCase))
         {
-            var pdcResult = isForce
-                ? await _pdcReleaseUpdateService.ForceCheckForUpdatesAsync(currentVersion, includePrerelease, cancellationToken)
-                : await _pdcReleaseUpdateService.CheckForUpdatesAsync(currentVersion, includePrerelease, cancellationToken);
+            var plondsResult = isForce
+                ? await _plondsReleaseUpdateService.ForceCheckForUpdatesAsync(currentVersion, includePrerelease, cancellationToken)
+                : await _plondsReleaseUpdateService.CheckForUpdatesAsync(currentVersion, includePrerelease, cancellationToken);
 
-            if (pdcResult.Success)
+            if (plondsResult.Success)
             {
-                return pdcResult;
+                return plondsResult;
             }
 
             AppLogger.Warn(
                 "UpdateSettings",
-                $"PDC update check failed and will fallback to GitHub. Error: {pdcResult.ErrorMessage}");
+                $"PLONDS update check failed and will fallback to GitHub. Error: {plondsResult.ErrorMessage}");
         }
 
         return isForce
@@ -1271,14 +1271,14 @@ internal sealed class ApplicationInfoService : IApplicationInfoService
 
     public string GetAppVersionText()
     {
-        // 优先从环境变量读取（Launcher 传递）
+        // 浼樺厛浠庣幆澧冨彉閲忚鍙栵紙Launcher 浼犻€掞級
         var envVersion = Environment.GetEnvironmentVariable(LanMountainDesktop.Shared.Contracts.Launcher.LauncherIpcConstants.VersionEnvVar);
         if (!string.IsNullOrWhiteSpace(envVersion))
         {
             return envVersion;
         }
 
-        // 回退：从程序集读取
+        // Fallback: read from application assembly.
         var assembly = typeof(App).Assembly;
         var informationalVersion = assembly
             .GetCustomAttribute<AssemblyInformationalVersionAttribute>()?
@@ -1318,14 +1318,14 @@ internal sealed class ApplicationInfoService : IApplicationInfoService
 
     public string GetAppCodenameText()
     {
-        // 优先从环境变量读取（Launcher 传递）
+        // 浼樺厛浠庣幆澧冨彉閲忚鍙栵紙Launcher 浼犻€掞級
         var envCodename = Environment.GetEnvironmentVariable(LanMountainDesktop.Shared.Contracts.Launcher.LauncherIpcConstants.CodenameEnvVar);
         if (!string.IsNullOrWhiteSpace(envCodename))
         {
             return envCodename;
         }
 
-        // 回退：使用默认开发代号
+        // Fallback: use default codename.
         return DefaultCodename;
     }
 

LanMountainDesktop/Services/UpdateSettingsValues.cs

@@ -12,9 +12,11 @@ public static class UpdateSettingsValues
     public const string ModeSilentOnExit = "silent_on_exit";
 
     // NOTE: keep constant name for compatibility with existing call sites.
-    public const string DownloadSourcePdc = "stcn";
-    public const string DownloadSourceStcn = DownloadSourcePdc;
-    public const string LegacyDownloadSourcePdc = "pdc";
+    public const string DownloadSourcePlonds = "stcn";
+    public const string DownloadSourcePdc = DownloadSourcePlonds;
+    public const string DownloadSourceStcn = DownloadSourcePlonds;
+    public const string LegacyDownloadSourcePlonds = "pdc";
+    public const string LegacyDownloadSourcePdc = LegacyDownloadSourcePlonds;
     public const string DownloadSourceGitHub = "github";
     public const string DownloadSourceGhProxy = "gh-proxy";
 
@@ -55,14 +57,14 @@ public static class UpdateSettingsValues
 
     public static string NormalizeDownloadSource(string? value)
     {
-        if (string.Equals(value, LegacyDownloadSourcePdc, StringComparison.OrdinalIgnoreCase))
+        if (string.Equals(value, LegacyDownloadSourcePlonds, StringComparison.OrdinalIgnoreCase))
         {
             return DownloadSourceStcn;
         }
 
-        if (string.Equals(value, DownloadSourcePdc, StringComparison.OrdinalIgnoreCase))
+        if (string.Equals(value, DownloadSourcePlonds, StringComparison.OrdinalIgnoreCase))
         {
-            return DownloadSourcePdc;
+            return DownloadSourcePlonds;
         }
 
         if (string.Equals(value, DownloadSourceGhProxy, StringComparison.OrdinalIgnoreCase))
@@ -75,7 +77,7 @@ public static class UpdateSettingsValues
             return DownloadSourceGitHub;
         }
 
-        // Default to STCN(PDC/S3). Runtime will fallback to GitHub if STCN is unavailable.
+        // Default to STCN(PLONDS/S3). Runtime will fallback to GitHub if STCN is unavailable.
         return DownloadSourceStcn;
     }
 

LanMountainDesktop/Services/UpdateWorkflowService.cs

@@ -61,16 +61,16 @@ public sealed class UpdateWorkflowService
     private const string SignedFileMapName = "files.json";
     private const string SignedFileMapSignatureName = "files.json.sig";
     private const string UpdateArchiveName = "update.zip";
-    private const string PdcFileMapName = "pdc-filemap.json";
-    private const string PdcFileMapSignatureName = "pdc-filemap.sig";
-    private const string PdcUpdateStateName = "pdc-update.json";
+    private const string PlondsFileMapName = "plonds-filemap.json";
+    private const string PlondsFileMapSignatureName = "plonds-filemap.sig";
+    private const string PlondsUpdateStateName = "plonds-update.json";
 
-    private static readonly HttpClient PdcHttpClient = new()
+    private static readonly HttpClient PlondsHttpClient = new()
     {
         Timeout = TimeSpan.FromMinutes(5)
     };
 
-    private static readonly ResumableDownloadService PdcDownloadService = new(PdcHttpClient);
+    private static readonly ResumableDownloadService PlondsDownloadService = new(PlondsHttpClient);
 
     public UpdateWorkflowService(ISettingsFacadeService settingsFacade)
     {
@@ -116,7 +116,7 @@ public sealed class UpdateWorkflowService
 
     public static bool IsDeltaUpdateAvailable(UpdateCheckResult checkResult)
     {
-        if (checkResult.PdcPayload is not null)
+        if (checkResult.PlondsPayload is not null)
         {
             return true;
         }
@@ -139,14 +139,14 @@ public sealed class UpdateWorkflowService
             return new UpdateDownloadResult(false, null, "No update available for delta download.");
         }
 
-        if (checkResult.PdcPayload is null && checkResult.Release is null)
+        if (checkResult.PlondsPayload is null && checkResult.Release is null)
         {
             return new UpdateDownloadResult(false, null, "No update payload is available for delta download.");
         }
 
-        if (checkResult.PdcPayload is not null)
+        if (checkResult.PlondsPayload is not null)
         {
-            return await DownloadPdcDeltaUpdateAsync(checkResult, progress, cancellationToken);
+            return await DownloadPlondsDeltaUpdateAsync(checkResult, progress, cancellationToken);
         }
 
         var release = checkResult.Release;
@@ -243,15 +243,15 @@ public sealed class UpdateWorkflowService
         return new UpdateDownloadResult(true, Path.Combine(incomingDir, SignedFileMapName), null);
     }
 
-    private async Task<UpdateDownloadResult> DownloadPdcDeltaUpdateAsync(
+    private async Task<UpdateDownloadResult> DownloadPlondsDeltaUpdateAsync(
         UpdateCheckResult checkResult,
         IProgress<double>? progress = null,
         CancellationToken cancellationToken = default)
     {
-        var payload = checkResult.PdcPayload;
+        var payload = checkResult.PlondsPayload;
         if (payload is null)
         {
-            return new UpdateDownloadResult(false, null, "PDC payload is missing.");
+            return new UpdateDownloadResult(false, null, "PLONDS payload is missing.");
         }
 
         var incomingDir = GetLauncherIncomingDirectory();
@@ -271,33 +271,33 @@ public sealed class UpdateWorkflowService
         {
             var state = _settingsFacade.Update.Get();
             var downloadThreads = Math.Max(1, state.UpdateDownloadThreads);
-            var fileMapPath = Path.Combine(incomingDir, PdcFileMapName);
-            var signaturePath = Path.Combine(incomingDir, PdcFileMapSignatureName);
-            var updateStatePath = Path.Combine(incomingDir, PdcUpdateStateName);
+            var fileMapPath = Path.Combine(incomingDir, PlondsFileMapName);
+            var signaturePath = Path.Combine(incomingDir, PlondsFileMapSignatureName);
+            var updateStatePath = Path.Combine(incomingDir, PlondsUpdateStateName);
 
-            var fileMapJson = await EnsurePdcTextResourceAsync(
+            var fileMapJson = await EnsurePlondsTextResourceAsync(
                 payload.FileMapJson,
                 payload.FileMapJsonUrl,
                 fileMapPath,
                 cancellationToken);
 
-            var fileMapSignature = await EnsurePdcTextResourceAsync(
+            var fileMapSignature = await EnsurePlondsTextResourceAsync(
                 payload.FileMapSignature,
                 payload.FileMapSignatureUrl,
                 signaturePath,
                 cancellationToken);
 
-            var downloadEntries = ParsePdcDownloadEntries(fileMapJson);
+            var downloadEntries = ParsePlondsDownloadEntries(fileMapJson);
             if (downloadEntries.Count == 0)
             {
-                return new UpdateDownloadResult(false, null, "PDC file map does not contain downloadable objects.");
+                return new UpdateDownloadResult(false, null, "PLONDS file map does not contain downloadable objects.");
             }
 
             var expectedObjectCount = downloadEntries.Count;
             var completedItems = 2;
             progress?.Report(expectedObjectCount == 0 ? 1d : (double)completedItems / (expectedObjectCount + 2));
 
-            var objectResults = new List<PdcDownloadedObjectInfo>(expectedObjectCount);
+            var objectResults = new List<PlondsDownloadedObjectInfo>(expectedObjectCount);
             var objectTargets = new HashSet<string>(StringComparer.OrdinalIgnoreCase);
             var totalSteps = expectedObjectCount + 2;
 
@@ -310,7 +310,7 @@ public sealed class UpdateWorkflowService
                     continue;
                 }
 
-                var destinationPath = GetPdcObjectDestinationPath(objectsDir, entry.ObjectHashHex);
+                var destinationPath = GetPlondsObjectDestinationPath(objectsDir, entry.ObjectHashHex);
                 var destinationDirectory = Path.GetDirectoryName(destinationPath);
                 if (!string.IsNullOrWhiteSpace(destinationDirectory))
                 {
@@ -319,10 +319,10 @@ public sealed class UpdateWorkflowService
 
                 if (File.Exists(destinationPath))
                 {
-                    var existingHash = await ComputeFileSha512HexAsync(destinationPath, cancellationToken);
+                    var existingHash = await ComputeFileSha256HexAsync(destinationPath, cancellationToken);
                     if (string.Equals(existingHash, entry.ObjectHashHex, StringComparison.OrdinalIgnoreCase))
                     {
-                        objectResults.Add(new PdcDownloadedObjectInfo(entry.ComponentId, entry.RelativePath, entry.DownloadUrl, entry.ObjectHashHex, destinationPath));
+                        objectResults.Add(new PlondsDownloadedObjectInfo(entry.ComponentId, entry.RelativePath, entry.DownloadUrl, entry.ObjectHashHex, destinationPath));
                         completedItems++;
                         progress?.Report((double)completedItems / totalSteps);
                         continue;
@@ -330,7 +330,7 @@ public sealed class UpdateWorkflowService
                 }
 
                 var downloadOptions = new DownloadOptions(MaxParallelSegments: downloadThreads);
-                var downloadResult = await PdcDownloadService.DownloadAsync(
+                var downloadResult = await PlondsDownloadService.DownloadAsync(
                     entry.DownloadUrl,
                     destinationPath,
                     downloadOptions,
@@ -339,22 +339,22 @@ public sealed class UpdateWorkflowService
 
                 if (!downloadResult.Success)
                 {
-                    return new UpdateDownloadResult(false, null, $"Failed to download PDC object {entry.RelativePath}: {downloadResult.ErrorMessage}");
+                    return new UpdateDownloadResult(false, null, $"Failed to download PLONDS object {entry.RelativePath}: {downloadResult.ErrorMessage}");
                 }
 
-                var actualHash = await ComputeFileSha512HexAsync(destinationPath, cancellationToken);
+                var actualHash = await ComputeFileSha256HexAsync(destinationPath, cancellationToken);
                 if (!string.IsNullOrWhiteSpace(actualHash) &&
                     !string.Equals(actualHash, entry.ObjectHashHex, StringComparison.OrdinalIgnoreCase))
                 {
-                    return new UpdateDownloadResult(false, null, $"PDC object hash mismatch for {entry.RelativePath}. Expected: {entry.ObjectHashHex}, Actual: {actualHash}");
+                    return new UpdateDownloadResult(false, null, $"PLONDS object hash mismatch for {entry.RelativePath}. Expected: {entry.ObjectHashHex}, Actual: {actualHash}");
                 }
 
-                objectResults.Add(new PdcDownloadedObjectInfo(entry.ComponentId, entry.RelativePath, entry.DownloadUrl, entry.ObjectHashHex, destinationPath));
+                objectResults.Add(new PlondsDownloadedObjectInfo(entry.ComponentId, entry.RelativePath, entry.DownloadUrl, entry.ObjectHashHex, destinationPath));
                 completedItems++;
                 progress?.Report((double)completedItems / totalSteps);
             }
 
-            var updateState = new PdcUpdateState(
+            var updateState = new PlondsUpdateState(
                 checkResult.LatestVersionText,
                 payload.DistributionId,
                 payload.ChannelId,
@@ -381,7 +381,7 @@ public sealed class UpdateWorkflowService
             });
 
             progress?.Report(1d);
-            AppLogger.Info("UpdateWorkflow", $"PDC update payload downloaded to {incomingDir}. Will be applied by Launcher on next startup.");
+            AppLogger.Info("UpdateWorkflow", $"PLONDS update payload downloaded to {incomingDir}. Will be applied by Launcher on next startup.");
             return new UpdateDownloadResult(true, updateStatePath, null);
         }
         catch (OperationCanceledException)
@@ -390,7 +390,7 @@ public sealed class UpdateWorkflowService
         }
         catch (Exception ex)
         {
-            AppLogger.Warn("UpdateWorkflow", "Failed to download PDC incremental payload.", ex);
+            AppLogger.Warn("UpdateWorkflow", "Failed to download PLONDS incremental payload.", ex);
             return new UpdateDownloadResult(false, null, ex.Message);
         }
     }
@@ -414,20 +414,20 @@ public sealed class UpdateWorkflowService
 
         // Incoming payload updates are identified by the local manifest or incoming directory path.
         return pendingPath.EndsWith(SignedFileMapName, StringComparison.OrdinalIgnoreCase)
-            || pendingPath.EndsWith(PdcUpdateStateName, StringComparison.OrdinalIgnoreCase)
-            || pendingPath.EndsWith(PdcFileMapName, StringComparison.OrdinalIgnoreCase)
-            || pendingPath.EndsWith(PdcFileMapSignatureName, StringComparison.OrdinalIgnoreCase)
+            || pendingPath.EndsWith(PlondsUpdateStateName, StringComparison.OrdinalIgnoreCase)
+            || pendingPath.EndsWith(PlondsFileMapName, StringComparison.OrdinalIgnoreCase)
+            || pendingPath.EndsWith(PlondsFileMapSignatureName, StringComparison.OrdinalIgnoreCase)
             || pendingPath.Contains(IncomingDirectoryName, StringComparison.OrdinalIgnoreCase);
     }
 
-    private static string GetPdcObjectDestinationPath(string objectsDirectory, string objectHashHex)
+    private static string GetPlondsObjectDestinationPath(string objectsDirectory, string objectHashHex)
     {
         var normalizedHash = objectHashHex.Trim().ToLowerInvariant();
         var shard = normalizedHash.Length >= 2 ? normalizedHash[..2] : normalizedHash;
         return Path.Combine(objectsDirectory, shard, normalizedHash);
     }
 
-    private static async Task<string> EnsurePdcTextResourceAsync(
+    private static async Task<string> EnsurePlondsTextResourceAsync(
         string? inlineContent,
         string? sourceUrl,
         string destinationPath,
@@ -441,25 +441,25 @@ public sealed class UpdateWorkflowService
 
         if (string.IsNullOrWhiteSpace(sourceUrl))
         {
-            throw new InvalidOperationException("PDC payload does not contain a file map source.");
+            throw new InvalidOperationException("PLONDS payload does not contain a file map source.");
         }
 
-        var downloadResult = await PdcDownloadService.DownloadAsync(
+        var downloadResult = await PlondsDownloadService.DownloadAsync(
             sourceUrl,
             destinationPath,
             cancellationToken: cancellationToken);
 
         if (!downloadResult.Success)
         {
-            throw new InvalidOperationException($"Failed to download PDC file map resource: {downloadResult.ErrorMessage}");
+            throw new InvalidOperationException($"Failed to download PLONDS file map resource: {downloadResult.ErrorMessage}");
         }
 
         return await File.ReadAllTextAsync(destinationPath, cancellationToken);
     }
 
-    private static IReadOnlyList<PdcDownloadEntry> ParsePdcDownloadEntries(string fileMapJson)
+    private static IReadOnlyList<PlondsDownloadEntry> ParsePlondsDownloadEntries(string fileMapJson)
     {
-        var entries = new List<PdcDownloadEntry>();
+        var entries = new List<PlondsDownloadEntry>();
         if (string.IsNullOrWhiteSpace(fileMapJson))
         {
             return entries;
@@ -472,25 +472,56 @@ public sealed class UpdateWorkflowService
             return entries;
         }
 
-        if (!TryGetPropertyIgnoreCase(root, "components", out var componentsNode) ||
-            componentsNode.ValueKind != JsonValueKind.Object)
+        if (!TryGetPropertyIgnoreCase(root, "components", out var componentsNode))
         {
             return entries;
         }
 
-        foreach (var component in componentsNode.EnumerateObject())
+        if (componentsNode.ValueKind == JsonValueKind.Object)
         {
-            if (component.Value.ValueKind != JsonValueKind.Object)
+            foreach (var component in componentsNode.EnumerateObject())
             {
-                continue;
-            }
+                if (component.Value.ValueKind != JsonValueKind.Object)
+                {
+                    continue;
+                }
 
-            if (!TryGetPropertyIgnoreCase(component.Value, "files", out var filesNode) ||
-                filesNode.ValueKind != JsonValueKind.Object)
+                if (!TryGetPropertyIgnoreCase(component.Value, "files", out var filesNode))
+                {
+                    continue;
+                }
+
+                AppendDownloadEntries(entries, component.Name, filesNode);
+            }
+        }
+        else if (componentsNode.ValueKind == JsonValueKind.Array)
+        {
+            foreach (var component in componentsNode.EnumerateArray())
             {
-                continue;
-            }
+                if (component.ValueKind != JsonValueKind.Object)
+                {
+                    continue;
+                }
 
+                var componentId = ReadStringIgnoreCase(component, "id")
+                                  ?? ReadStringIgnoreCase(component, "name")
+                                  ?? "app";
+                if (!TryGetPropertyIgnoreCase(component, "files", out var filesNode))
+                {
+                    continue;
+                }
+
+                AppendDownloadEntries(entries, componentId, filesNode);
+            }
+        }
+
+        return entries;
+    }
+
+    private static void AppendDownloadEntries(ICollection<PlondsDownloadEntry> entries, string componentId, JsonElement filesNode)
+    {
+        if (filesNode.ValueKind == JsonValueKind.Object)
+        {
             foreach (var fileEntry in filesNode.EnumerateObject())
             {
                 if (fileEntry.Value.ValueKind != JsonValueKind.Object)
@@ -498,30 +529,82 @@ public sealed class UpdateWorkflowService
                     continue;
                 }
 
-                var downloadUrl = ReadStringIgnoreCase(fileEntry.Value, "archivedownloadurl")
-                                  ?? ReadStringIgnoreCase(fileEntry.Value, "downloadurl")
-                                  ?? ReadStringIgnoreCase(fileEntry.Value, "url");
-                var hashBytes = ReadByteArrayIgnoreCase(fileEntry.Value, "archivesha512")
-                                ?? ReadByteArrayIgnoreCase(fileEntry.Value, "filesha512");
-
-                if (string.IsNullOrWhiteSpace(downloadUrl) || hashBytes is null || hashBytes.Length == 0)
+                if (TryCreateDownloadEntry(componentId, fileEntry.Name, fileEntry.Value, out var entry))
                 {
-                    continue;
+                    entries.Add(entry);
                 }
+            }
 
-                var hashHex = Convert.ToHexString(hashBytes).ToLowerInvariant();
-                entries.Add(new PdcDownloadEntry(
-                    component.Name,
-                    fileEntry.Name,
-                    downloadUrl,
-                    hashHex));
+            return;
+        }
+
+        if (filesNode.ValueKind != JsonValueKind.Array)
+        {
+            return;
+        }
+
+        foreach (var fileEntry in filesNode.EnumerateArray())
+        {
+            if (fileEntry.ValueKind != JsonValueKind.Object)
+            {
+                continue;
+            }
+
+            var relativePath = ReadStringIgnoreCase(fileEntry, "path");
+            if (TryCreateDownloadEntry(componentId, relativePath, fileEntry, out var entry))
+            {
+                entries.Add(entry);
+            }
+        }
+    }
+
+    private static bool TryCreateDownloadEntry(
+        string componentId,
+        string? relativePath,
+        JsonElement fileNode,
+        out PlondsDownloadEntry entry)
+    {
+        entry = default!;
+
+        var normalizedPath = string.IsNullOrWhiteSpace(relativePath)
+            ? null
+            : relativePath.Trim();
+        var downloadUrl = ReadStringIgnoreCase(fileNode, "objecturl")
+                          ?? ReadStringIgnoreCase(fileNode, "downloadurl")
+                          ?? ReadStringIgnoreCase(fileNode, "archivedownloadurl")
+                          ?? ReadStringIgnoreCase(fileNode, "url");
+        var hashHex = ReadStringIgnoreCase(fileNode, "sha256")
+                      ?? ReadStringIgnoreCase(fileNode, "filesha256")
+                      ?? ReadStringIgnoreCase(fileNode, "contenthash");
+
+        if ((string.IsNullOrWhiteSpace(hashHex) || string.IsNullOrWhiteSpace(downloadUrl)) &&
+            TryGetPropertyIgnoreCase(fileNode, "hash", out var hashNode) &&
+            hashNode.ValueKind == JsonValueKind.Object)
+        {
+            var algorithm = ReadStringIgnoreCase(hashNode, "algorithm");
+            if (string.IsNullOrWhiteSpace(algorithm) ||
+                algorithm.Contains("sha256", StringComparison.OrdinalIgnoreCase))
+            {
+                hashHex ??= ReadStringIgnoreCase(hashNode, "value");
             }
         }
 
-        return entries;
+        if (string.IsNullOrWhiteSpace(normalizedPath) ||
+            string.IsNullOrWhiteSpace(downloadUrl) ||
+            string.IsNullOrWhiteSpace(hashHex))
+        {
+            return false;
+        }
+
+        entry = new PlondsDownloadEntry(
+            componentId,
+            normalizedPath,
+            downloadUrl,
+            NormalizeHashText(hashHex));
+        return true;
     }
 
-    private static async Task<string?> ComputeFileSha512HexAsync(string filePath, CancellationToken cancellationToken)
+    private static async Task<string?> ComputeFileSha256HexAsync(string filePath, CancellationToken cancellationToken)
     {
         if (!File.Exists(filePath))
         {
@@ -529,10 +612,22 @@ public sealed class UpdateWorkflowService
         }
 
         await using var stream = new FileStream(filePath, FileMode.Open, FileAccess.Read, FileShare.Read);
-        var hashBytes = await SHA512.HashDataAsync(stream, cancellationToken);
+        var hashBytes = await SHA256.HashDataAsync(stream, cancellationToken);
         return Convert.ToHexString(hashBytes).ToLowerInvariant();
     }
 
+    private static string NormalizeHashText(string hash)
+    {
+        var normalized = hash.Trim();
+        var separator = normalized.IndexOf(':');
+        if (separator >= 0 && separator < normalized.Length - 1)
+        {
+            normalized = normalized[(separator + 1)..];
+        }
+
+        return normalized.Replace("-", string.Empty).Trim().ToLowerInvariant();
+    }
+
     private static bool TryGetPropertyIgnoreCase(JsonElement node, string propertyName, out JsonElement value)
     {
         if (node.ValueKind == JsonValueKind.Object)
@@ -641,20 +736,20 @@ public sealed class UpdateWorkflowService
         return true;
     }
 
-    private sealed record PdcDownloadEntry(
+    private sealed record PlondsDownloadEntry(
         string ComponentId,
         string RelativePath,
         string DownloadUrl,
         string ObjectHashHex);
 
-    private sealed record PdcDownloadedObjectInfo(
+    private sealed record PlondsDownloadedObjectInfo(
         string ComponentId,
         string RelativePath,
         string SourceUrl,
         string ObjectHashHex,
         string LocalPath);
 
-    private sealed record PdcUpdateState(
+    private sealed record PlondsUpdateState(
         string VersionText,
         string DistributionId,
         string ChannelId,
@@ -665,7 +760,7 @@ public sealed class UpdateWorkflowService
         DateTimeOffset DownloadedAtUtc,
         string FileMapJson,
         string FileMapSignature,
-        IReadOnlyList<PdcDownloadedObjectInfo> Objects);
+        IReadOnlyList<PlondsDownloadedObjectInfo> Objects);
 
     private static bool TryResolveDeltaAssets(
         IReadOnlyList<GitHubReleaseAsset> assets,
@@ -776,7 +871,7 @@ public sealed class UpdateWorkflowService
     {
         ArgumentNullException.ThrowIfNull(checkResult);
 
-        if (checkResult.PdcPayload is not null)
+        if (checkResult.PlondsPayload is not null)
         {
             return await DownloadDeltaUpdateAsync(checkResult, progress, cancellationToken);
         }
@@ -837,7 +932,7 @@ public sealed class UpdateWorkflowService
     {
         ArgumentNullException.ThrowIfNull(checkResult);
 
-        if (checkResult.PdcPayload is not null)
+        if (checkResult.PlondsPayload is not null)
         {
             ClearPendingUpdate();
             return await DownloadDeltaUpdateAsync(checkResult, progress, cancellationToken);
@@ -912,14 +1007,14 @@ public sealed class UpdateWorkflowService
             if (IsPendingDeltaUpdate())
             {
                 var pdcUpdatePath = pending.InstallerPath;
-                var pdcFileMapPath = Path.Combine(Path.GetDirectoryName(pdcUpdatePath) ?? string.Empty, PdcFileMapName);
-                var pdcSignaturePath = Path.Combine(Path.GetDirectoryName(pdcUpdatePath) ?? string.Empty, PdcFileMapSignatureName);
+                var pdcFileMapPath = Path.Combine(Path.GetDirectoryName(pdcUpdatePath) ?? string.Empty, PlondsFileMapName);
+                var pdcSignaturePath = Path.Combine(Path.GetDirectoryName(pdcUpdatePath) ?? string.Empty, PlondsFileMapSignatureName);
                 if (File.Exists(pdcUpdatePath) && File.Exists(pdcFileMapPath) && File.Exists(pdcSignaturePath))
                 {
                     return new UpdateVerifyResult(true, true, null, null, null);
                 }
 
-                return new UpdateVerifyResult(false, false, null, null, "PDC update payload is incomplete.");
+                return new UpdateVerifyResult(false, false, null, null, "PLONDS update payload is incomplete.");
             }
 
             return new UpdateVerifyResult(false, false, null, null, "Installer file does not exist.");
@@ -961,7 +1056,7 @@ public sealed class UpdateWorkflowService
         {
             // Always check for updates on startup (removed AutoCheckUpdates check)
             var result = await CheckForUpdatesAsync(currentVersion, isForce: false, cancellationToken);
-            if (!result.Success || !result.IsUpdateAvailable || (result.Release is null && result.PdcPayload is null))
+            if (!result.Success || !result.IsUpdateAvailable || (result.Release is null && result.PlondsPayload is null))
             {
                 return;
             }

PenguinLogisticsOnlineNetworkDistributionSystem/Directory.Build.props

@@ -0,0 +1,14 @@
+<Project>
+  <PropertyGroup>
+    <Version>0.1.0</Version>
+    <VersionPrefix>0.1.0</VersionPrefix>
+    <PackageVersion>0.1.0</PackageVersion>
+    <AssemblyVersion>0.1.0.0</AssemblyVersion>
+    <FileVersion>0.1.0.0</FileVersion>
+    <TargetFramework>net10.0</TargetFramework>
+    <Nullable>enable</Nullable>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <TreatWarningsAsErrors>false</TreatWarningsAsErrors>
+    <IsPackable>false</IsPackable>
+  </PropertyGroup>
+</Project>

PenguinLogisticsOnlineNetworkDistributionSystem/README.md

@@ -0,0 +1,93 @@
+# PLONDS Skeleton
+
+Penguin Logistics Online Network Distribution System, or PLONDS, is the standalone update-distribution skeleton for LanMountainDesktop.
+
+This directory is intentionally isolated from the main app and Launcher. It contains only the new distribution protocol, a thin read-only API, and sample S3-style metadata files.
+
+## Directory Layout
+
+```text
+PenguinLogisticsOnlineNetworkDistributionSystem/
+  README.md
+  src/
+    Plonds.Shared/
+    Plonds.Api/
+  sample-data/
+    meta/
+      channels/
+        stable/
+          windows-x64/
+          windows-x86/
+          linux-x64/
+      distributions/
+```
+
+## Projects
+
+- `Plonds.Shared` provides protocol constants and models.
+- `Plonds.Core` owns hashing, diffing, object-repo generation, manifest generation, signing, and publish orchestration.
+- `Plonds.Tool` is the CI-facing CLI entrypoint. PowerShell should stay as a thin wrapper around this tool.
+- `Plonds.Api` is a thin read-only API that reads metadata from a local folder laid out like S3.
+
+## Architecture
+
+PLONDS is intentionally built around a single C# implementation stack so the protocol and publish behavior do not drift across languages.
+
+```text
+Host App
+  -> checks updates, downloads objects, stages incoming payload
+Launcher
+  -> verifies signature, applies file map, switches deployment, rolls back
+
+PLONDS.Api
+  -> read-only metadata projection for clients
+PLONDS.Tool
+  -> CI/release command surface
+PLONDS.Core
+  -> hash/diff/object-repo/sign/publish implementation
+PLONDS.Shared
+  -> protocol constants and DTOs
+```
+
+Rules for v1:
+
+- Core protocol behavior should live in `Plonds.Core`, not in PowerShell scripts.
+- `scripts/*.ps1` may remain only as thin wrappers for GitHub Actions and local convenience.
+- Host keeps download responsibility.
+- Launcher keeps apply, atomic switch, snapshot, and rollback responsibility.
+
+## Storage Layout
+
+The first version keeps one fixed object root:
+
+```text
+lanmountain/update/
+  repo/sha256/<prefix>/<hash>
+  meta/channels/<channel>/<platform>/latest.json
+  meta/distributions/<distributionId>.json
+  installers/<platform>/<version>/...
+```
+
+Planned but not enabled in v1:
+
+```text
+lanmountain/update/repo-compressed/<algo>/<prefix>/<hash>
+lanmountain/update/patches/<algo>/<baseHash>/<targetHash>
+```
+
+## Public Endpoints
+
+The API base path is `/api/plonds/v1`.
+
+- `GET /healthz`
+- `GET /api/plonds/v1/metadata`
+- `GET /api/plonds/v1/channels/{channel}/{platform}/latest?currentVersion=...`
+- `GET /api/plonds/v1/distributions/{distributionId}`
+
+## Local Run
+
+```powershell
+dotnet run --project src/Plonds.Api
+```
+
+By default the API reads metadata from `sample-data`.

PenguinLogisticsOnlineNetworkDistributionSystem/sample-data/meta/channels/stable/linux-x64/latest.json

@@ -0,0 +1,10 @@
+{
+  "channel": "stable",
+  "platform": "linux-x64",
+  "distributionId": "plonds-0.8.5.2-linux-x64",
+  "version": "0.8.5.2",
+  "publishedAt": "2026-04-20T00:00:00Z",
+  "distributionPath": "meta/distributions/plonds-0.8.5.2-linux-x64.json",
+  "fileMapPath": "meta/distributions/plonds-0.8.5.2-linux-x64.json"
+}
+

PenguinLogisticsOnlineNetworkDistributionSystem/sample-data/meta/channels/stable/windows-x64/latest.json

@@ -0,0 +1,10 @@
+{
+  "channel": "stable",
+  "platform": "windows-x64",
+  "distributionId": "plonds-0.8.5.2-windows-x64",
+  "version": "0.8.5.2",
+  "publishedAt": "2026-04-20T00:00:00Z",
+  "distributionPath": "meta/distributions/plonds-0.8.5.2-windows-x64.json",
+  "fileMapPath": "meta/distributions/plonds-0.8.5.2-windows-x64.json"
+}
+

PenguinLogisticsOnlineNetworkDistributionSystem/sample-data/meta/channels/stable/windows-x86/latest.json

@@ -0,0 +1,10 @@
+{
+  "channel": "stable",
+  "platform": "windows-x86",
+  "distributionId": "plonds-0.8.5.2-windows-x86",
+  "version": "0.8.5.2",
+  "publishedAt": "2026-04-20T00:00:00Z",
+  "distributionPath": "meta/distributions/plonds-0.8.5.2-windows-x86.json",
+  "fileMapPath": "meta/distributions/plonds-0.8.5.2-windows-x86.json"
+}
+

PenguinLogisticsOnlineNetworkDistributionSystem/sample-data/meta/distributions/plonds-0.8.5.2-linux-x64.json

@@ -0,0 +1,66 @@
+{
+  "distributionId": "plonds-0.8.5.2-linux-x64",
+  "version": "0.8.5.2",
+  "channel": "stable",
+  "platform": "linux-x64",
+  "publishedAt": "2026-04-20T00:00:00Z",
+  "components": [
+    {
+      "id": "app",
+      "root": "app-0.8.5.2/",
+      "mode": "file-object",
+      "metadata": {
+        "allowDiffUpdate": "true"
+      },
+      "files": [
+        {
+          "path": "LanMountainDesktop",
+          "op": "replace",
+          "contentHash": "sha256-placeholder-lanmountain-linux",
+          "size": 2048000,
+          "mode": "file-object",
+          "objectKey": "repo/sha256/sha256-placeholder-lanmountain-linux"
+        }
+      ]
+    },
+    {
+      "id": "installers",
+      "root": "installers/linux-x64/",
+      "mode": "file-object",
+      "files": [
+        {
+          "path": "LanMountainDesktop-0.8.5.2-linux-x64.deb",
+          "op": "add",
+          "contentHash": "sha256-placeholder-linux-x64-installer",
+          "size": 3096576,
+          "mode": "file-object",
+          "objectKey": "installers/linux-x64/LanMountainDesktop-0.8.5.2-linux-x64.deb"
+        }
+      ]
+    }
+  ],
+  "installerMirrors": [
+    {
+      "platform": "linux",
+      "arch": "x64",
+      "url": "https://downloads.example.invalid/lanmountain/linux-x64/LanMountainDesktop-0.8.5.2-linux-x64.deb",
+      "fileName": "LanMountainDesktop-0.8.5.2-linux-x64.deb"
+    }
+  ],
+  "capabilities": [
+    "file-object",
+    "compressed-object",
+    "binary-patch"
+  ],
+  "signatures": [
+    {
+      "algorithm": "rsa-sha256",
+      "keyId": "lanmountain-main",
+      "signature": "placeholder-signature"
+    }
+  ],
+  "metadata": {
+    "notes": "sample distribution for PLONDS skeleton"
+  }
+}
+

PenguinLogisticsOnlineNetworkDistributionSystem/sample-data/meta/distributions/plonds-0.8.5.2-windows-x64.json

@@ -0,0 +1,66 @@
+{
+  "distributionId": "plonds-0.8.5.2-windows-x64",
+  "version": "0.8.5.2",
+  "channel": "stable",
+  "platform": "windows-x64",
+  "publishedAt": "2026-04-20T00:00:00Z",
+  "components": [
+    {
+      "id": "app",
+      "root": "app-0.8.5.2/",
+      "mode": "file-object",
+      "metadata": {
+        "allowDiffUpdate": "true"
+      },
+      "files": [
+        {
+          "path": "LanMountainDesktop.exe",
+          "op": "replace",
+          "contentHash": "sha256-placeholder-lanmountain-exe",
+          "size": 1024000,
+          "mode": "file-object",
+          "objectKey": "repo/sha256/sha256-placeholder-lanmountain-exe"
+        }
+      ]
+    },
+    {
+      "id": "installers",
+      "root": "installers/windows-x64/",
+      "mode": "file-object",
+      "files": [
+        {
+          "path": "LanMountainDesktop-Setup-0.8.5.2-x64.exe",
+          "op": "add",
+          "contentHash": "sha256-placeholder-windows-x64-installer",
+          "size": 2048000,
+          "mode": "file-object",
+          "objectKey": "installers/windows-x64/LanMountainDesktop-Setup-0.8.5.2-x64.exe"
+        }
+      ]
+    }
+  ],
+  "installerMirrors": [
+    {
+      "platform": "windows",
+      "arch": "x64",
+      "url": "https://downloads.example.invalid/lanmountain/windows-x64/LanMountainDesktop-Setup-0.8.5.2-x64.exe",
+      "fileName": "LanMountainDesktop-Setup-0.8.5.2-x64.exe"
+    }
+  ],
+  "capabilities": [
+    "file-object",
+    "compressed-object",
+    "binary-patch"
+  ],
+  "signatures": [
+    {
+      "algorithm": "rsa-sha256",
+      "keyId": "lanmountain-main",
+      "signature": "placeholder-signature"
+    }
+  ],
+  "metadata": {
+    "notes": "sample distribution for PLONDS skeleton"
+  }
+}
+

PenguinLogisticsOnlineNetworkDistributionSystem/sample-data/meta/distributions/plonds-0.8.5.2-windows-x86.json

@@ -0,0 +1,66 @@
+{
+  "distributionId": "plonds-0.8.5.2-windows-x86",
+  "version": "0.8.5.2",
+  "channel": "stable",
+  "platform": "windows-x86",
+  "publishedAt": "2026-04-20T00:00:00Z",
+  "components": [
+    {
+      "id": "app",
+      "root": "app-0.8.5.2/",
+      "mode": "file-object",
+      "metadata": {
+        "allowDiffUpdate": "true"
+      },
+      "files": [
+        {
+          "path": "LanMountainDesktop.exe",
+          "op": "replace",
+          "contentHash": "sha256-placeholder-lanmountain-exe-x86",
+          "size": 983040,
+          "mode": "file-object",
+          "objectKey": "repo/sha256/sha256-placeholder-lanmountain-exe-x86"
+        }
+      ]
+    },
+    {
+      "id": "installers",
+      "root": "installers/windows-x86/",
+      "mode": "file-object",
+      "files": [
+        {
+          "path": "LanMountainDesktop-Setup-0.8.5.2-x86.exe",
+          "op": "add",
+          "contentHash": "sha256-placeholder-windows-x86-installer",
+          "size": 1982464,
+          "mode": "file-object",
+          "objectKey": "installers/windows-x86/LanMountainDesktop-Setup-0.8.5.2-x86.exe"
+        }
+      ]
+    }
+  ],
+  "installerMirrors": [
+    {
+      "platform": "windows",
+      "arch": "x86",
+      "url": "https://downloads.example.invalid/lanmountain/windows-x86/LanMountainDesktop-Setup-0.8.5.2-x86.exe",
+      "fileName": "LanMountainDesktop-Setup-0.8.5.2-x86.exe"
+    }
+  ],
+  "capabilities": [
+    "file-object",
+    "compressed-object",
+    "binary-patch"
+  ],
+  "signatures": [
+    {
+      "algorithm": "rsa-sha256",
+      "keyId": "lanmountain-main",
+      "signature": "placeholder-signature"
+    }
+  ],
+  "metadata": {
+    "notes": "sample distribution for PLONDS skeleton"
+  }
+}
+

PenguinLogisticsOnlineNetworkDistributionSystem/src/Plonds.Api/Configuration/PlondsApiOptions.cs

@@ -0,0 +1,11 @@
+namespace Plonds.Api.Configuration;
+
+public sealed class PlondsApiOptions
+{
+    public string StorageRoot { get; set; } = Plonds.Shared.PlondsConstants.DefaultStorageRoot;
+
+    public string MetaRoot { get; set; } = Plonds.Shared.PlondsConstants.DefaultMetaRoot;
+
+    public string ApiBasePath { get; set; } = Plonds.Shared.PlondsConstants.DefaultApiBasePath;
+}
+

PenguinLogisticsOnlineNetworkDistributionSystem/src/Plonds.Api/Plonds.Api.csproj

@@ -0,0 +1,10 @@
+<Project Sdk="Microsoft.NET.Sdk.Web">
+  <PropertyGroup>
+    <RootNamespace>Plonds.Api</RootNamespace>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\Plonds.Shared\Plonds.Shared.csproj" />
+  </ItemGroup>
+</Project>
+

PenguinLogisticsOnlineNetworkDistributionSystem/src/Plonds.Api/Program.cs

@@ -0,0 +1,86 @@
+using Microsoft.Extensions.Options;
+using Plonds.Api.Configuration;
+using Plonds.Api.Services;
+using Plonds.Shared;
+
+var builder = WebApplication.CreateBuilder(args);
+
+builder.Services.Configure<PlondsApiOptions>(builder.Configuration.GetSection("Plonds"));
+builder.Services.AddSingleton(sp =>
+{
+    var options = sp.GetRequiredService<IOptions<PlondsApiOptions>>().Value;
+    return options;
+});
+builder.Services.AddSingleton<IPlondsManifestStore>(sp =>
+{
+    var options = sp.GetRequiredService<PlondsApiOptions>();
+    return new FileSystemPlondsManifestStore(options);
+});
+
+var app = builder.Build();
+
+var apiBasePath = app.Configuration["Plonds:ApiBasePath"];
+if (string.IsNullOrWhiteSpace(apiBasePath))
+{
+    apiBasePath = PlondsConstants.DefaultApiBasePath;
+}
+
+if (!apiBasePath.StartsWith('/'))
+{
+    apiBasePath = "/" + apiBasePath;
+}
+
+app.MapGet("/healthz", () => Results.Ok(new { status = "ok", protocol = PlondsConstants.ProtocolName, version = PlondsConstants.ProtocolVersion }));
+
+app.MapGet($"{apiBasePath}/metadata", async (IPlondsManifestStore store, CancellationToken cancellationToken) =>
+{
+    var catalog = await store.GetCatalogAsync(cancellationToken);
+    return Results.Ok(catalog);
+});
+
+app.MapGet($"{apiBasePath}/channels/{{channel}}/{{platform}}/latest", async (
+    string channel,
+    string platform,
+    string? currentVersion,
+    IPlondsManifestStore store,
+    CancellationToken cancellationToken) =>
+{
+    var latest = await store.GetLatestAsync(channel, platform, cancellationToken);
+    if (latest is null)
+    {
+        return Results.NotFound(new
+        {
+            error = "latest_pointer_not_found",
+            channel,
+            platform
+        });
+    }
+
+    if (!string.IsNullOrWhiteSpace(currentVersion) &&
+        Version.TryParse(currentVersion, out var current) &&
+        Version.TryParse(latest.Version, out var target) &&
+        target <= current)
+    {
+        return Results.NoContent();
+    }
+
+    return Results.Ok(latest);
+});
+
+app.MapGet($"{apiBasePath}/distributions/{{distributionId}}", async (string distributionId, IPlondsManifestStore store, CancellationToken cancellationToken) =>
+{
+    var distribution = await store.GetDistributionAsync(distributionId, cancellationToken);
+    if (distribution is null)
+    {
+        return Results.NotFound(new
+        {
+            error = "distribution_not_found",
+            distributionId
+        });
+    }
+
+    return Results.Ok(distribution);
+});
+
+app.Run();
+

PenguinLogisticsOnlineNetworkDistributionSystem/src/Plonds.Api/Services/FileSystemPlondsManifestStore.cs

@@ -0,0 +1,138 @@
+using System.Text.Json;
+using Plonds.Api.Configuration;
+using Plonds.Shared;
+using Plonds.Shared.Models;
+
+namespace Plonds.Api.Services;
+
+public sealed class FileSystemPlondsManifestStore : IPlondsManifestStore
+{
+    private static readonly JsonSerializerOptions JsonOptions = new(JsonSerializerDefaults.Web)
+    {
+        WriteIndented = true
+    };
+
+    private readonly PlondsApiOptions _options;
+    private readonly string _storageRootFullPath;
+    private readonly string _metaRootFullPath;
+
+    public FileSystemPlondsManifestStore(PlondsApiOptions options)
+    {
+        _options = options;
+        _storageRootFullPath = ResolveRootPath(options.StorageRoot);
+        _metaRootFullPath = Path.Combine(_storageRootFullPath, options.MetaRoot);
+    }
+
+    public Task<PlondsMetadataCatalog> GetCatalogAsync(CancellationToken cancellationToken = default)
+    {
+        _ = cancellationToken;
+
+        var channelsRoot = Path.Combine(_metaRootFullPath, "channels");
+        var latest = new List<PlondsChannelPointer>();
+        if (Directory.Exists(channelsRoot))
+        {
+            foreach (var latestPath in Directory.EnumerateFiles(channelsRoot, "latest.json", SearchOption.AllDirectories))
+            {
+                var pointer = ReadLatestPointer(latestPath);
+                if (pointer is not null)
+                {
+                    latest.Add(pointer);
+                }
+            }
+        }
+
+        var catalog = new PlondsMetadataCatalog(
+            ProtocolName: PlondsConstants.ProtocolName,
+            ProtocolVersion: PlondsConstants.ProtocolVersion,
+            StorageRoot: _storageRootFullPath,
+            MetaRoot: _metaRootFullPath,
+            Latest: latest.OrderBy(x => x.Channel, StringComparer.OrdinalIgnoreCase)
+                .ThenBy(x => x.Platform, StringComparer.OrdinalIgnoreCase)
+                .ToArray(),
+            Metadata: new Dictionary<string, string>
+            {
+                ["apiBasePath"] = PlondsConstants.DefaultApiBasePath
+            });
+
+        return Task.FromResult(catalog);
+    }
+
+    public Task<PlondsChannelPointer?> GetLatestAsync(string channel, string platform, CancellationToken cancellationToken = default)
+    {
+        _ = cancellationToken;
+        return Task.FromResult(ReadLatestPointer(GetLatestPath(channel, platform)));
+    }
+
+    public Task<PlondsDistributionInfo?> GetDistributionAsync(string distributionId, CancellationToken cancellationToken = default)
+    {
+        _ = cancellationToken;
+
+        var path = GetDistributionPath(distributionId);
+        if (!File.Exists(path))
+        {
+            return Task.FromResult<PlondsDistributionInfo?>(null);
+        }
+
+        var json = File.ReadAllText(path);
+        var distribution = JsonSerializer.Deserialize<PlondsDistributionInfo>(json, JsonOptions);
+        return Task.FromResult(distribution);
+    }
+
+    private PlondsChannelPointer? ReadLatestPointer(string path)
+    {
+        if (!File.Exists(path))
+        {
+            return null;
+        }
+
+        var json = File.ReadAllText(path);
+        var pointer = JsonSerializer.Deserialize<PlondsChannelPointer>(json, JsonOptions);
+        return pointer;
+    }
+
+    private string GetLatestPath(string channel, string platform)
+    {
+        return Path.Combine(_metaRootFullPath, "channels", channel, platform, "latest.json");
+    }
+
+    private string GetDistributionPath(string distributionId)
+    {
+        return Path.Combine(_metaRootFullPath, "distributions", $"{distributionId}.json");
+    }
+
+    private static string ResolveRootPath(string root)
+    {
+        if (Path.IsPathRooted(root))
+        {
+            return Path.GetFullPath(root);
+        }
+
+        var candidates = new List<string>();
+
+        AddCandidateChain(candidates, Directory.GetCurrentDirectory(), root);
+        AddCandidateChain(candidates, AppContext.BaseDirectory, root);
+
+        foreach (var candidate in candidates.Distinct(StringComparer.OrdinalIgnoreCase))
+        {
+            if (Directory.Exists(candidate))
+            {
+                return candidate;
+            }
+        }
+
+        return candidates.FirstOrDefault() ?? Path.GetFullPath(Path.Combine(AppContext.BaseDirectory, root));
+    }
+
+    private static void AddCandidateChain(ICollection<string> candidates, string? startDirectory, string relativeRoot)
+    {
+        var current = string.IsNullOrWhiteSpace(startDirectory)
+            ? null
+            : Path.GetFullPath(startDirectory);
+
+        while (!string.IsNullOrWhiteSpace(current))
+        {
+            candidates.Add(Path.GetFullPath(Path.Combine(current, relativeRoot)));
+            current = Directory.GetParent(current)?.FullName;
+        }
+    }
+}

PenguinLogisticsOnlineNetworkDistributionSystem/src/Plonds.Api/Services/IPlondsManifestStore.cs

@@ -0,0 +1,13 @@
+using Plonds.Shared.Models;
+
+namespace Plonds.Api.Services;
+
+public interface IPlondsManifestStore
+{
+    Task<PlondsMetadataCatalog> GetCatalogAsync(CancellationToken cancellationToken = default);
+
+    Task<PlondsChannelPointer?> GetLatestAsync(string channel, string platform, CancellationToken cancellationToken = default);
+
+    Task<PlondsDistributionInfo?> GetDistributionAsync(string distributionId, CancellationToken cancellationToken = default);
+}
+

PenguinLogisticsOnlineNetworkDistributionSystem/src/Plonds.Api/appsettings.json

@@ -0,0 +1,8 @@
+{
+  "Plonds": {
+    "StorageRoot": "sample-data",
+    "MetaRoot": "meta",
+    "ApiBasePath": "/api/plonds/v1"
+  }
+}
+

PenguinLogisticsOnlineNetworkDistributionSystem/src/Plonds.Core/Plonds.Core.csproj

@@ -0,0 +1,5 @@
+<Project Sdk="Microsoft.NET.Sdk">
+  <ItemGroup>
+    <ProjectReference Include="..\Plonds.Shared\Plonds.Shared.csproj" />
+  </ItemGroup>
+</Project>

PenguinLogisticsOnlineNetworkDistributionSystem/src/Plonds.Core/Publishing/PlatformPublishResult.cs

@@ -0,0 +1,13 @@
+namespace Plonds.Core.Publishing;
+
+public sealed record PlatformPublishResult(
+    string Platform,
+    string DistributionId,
+    string CurrentAppDirectory,
+    string? PreviousDirectory,
+    string PreviousVersion,
+    string FileMapPath,
+    string SignaturePath,
+    string DistributionPath,
+    string LatestPath,
+    IReadOnlyList<string> InstallerFiles);

PenguinLogisticsOnlineNetworkDistributionSystem/src/Plonds.Core/Publishing/PlondsGenerateOptions.cs

@@ -0,0 +1,16 @@
+namespace Plonds.Core.Publishing;
+
+public sealed record PlondsGenerateOptions(
+    string CurrentVersion,
+    string CurrentDirectory,
+    string Platform,
+    string OutputRoot,
+    string PreviousVersion = "0.0.0",
+    string? PreviousDirectory = null,
+    string Channel = "stable",
+    string? DistributionId = null,
+    string? RepoBaseUrl = null,
+    string? FileMapUrl = null,
+    string? FileMapSignatureUrl = null,
+    string? InstallerDirectory = null,
+    string? InstallerBaseUrl = null);

PenguinLogisticsOnlineNetworkDistributionSystem/src/Plonds.Core/Publishing/PlondsGenerator.cs

@@ -0,0 +1,351 @@
+using System.Security.Cryptography;
+using System.Text;
+using System.Text.Json;
+
+namespace Plonds.Core.Publishing;
+
+public sealed class PlondsGenerator
+{
+    private static readonly JsonSerializerOptions JsonOptions = new()
+    {
+        PropertyNamingPolicy = JsonNamingPolicy.CamelCase,
+        WriteIndented = true
+    };
+
+    public PlatformPublishResult Generate(PlondsGenerateOptions options)
+    {
+        ArgumentNullException.ThrowIfNull(options);
+
+        var currentDirectory = Path.GetFullPath(options.CurrentDirectory);
+        if (!Directory.Exists(currentDirectory))
+        {
+            throw new DirectoryNotFoundException($"Current directory not found: {currentDirectory}");
+        }
+
+        var previousDirectory = string.IsNullOrWhiteSpace(options.PreviousDirectory)
+            ? null
+            : Path.GetFullPath(options.PreviousDirectory);
+
+        var distributionId = string.IsNullOrWhiteSpace(options.DistributionId)
+            ? $"plonds-{options.CurrentVersion}-{options.Platform}"
+            : options.DistributionId.Trim();
+
+        var outputRoot = Path.GetFullPath(options.OutputRoot);
+        var repoRoot = Path.Combine(outputRoot, "repo", "sha256");
+        var manifestsRoot = Path.Combine(outputRoot, "manifests", distributionId);
+        var metaDistributionRoot = Path.Combine(outputRoot, "meta", "distributions");
+        var metaChannelRoot = Path.Combine(outputRoot, "meta", "channels", options.Channel, options.Platform);
+        var installerMirrorRoot = Path.Combine(outputRoot, "installers", options.Platform, options.CurrentVersion);
+
+        Directory.CreateDirectory(repoRoot);
+        Directory.CreateDirectory(manifestsRoot);
+        Directory.CreateDirectory(metaDistributionRoot);
+        Directory.CreateDirectory(metaChannelRoot);
+
+        var previousManifest = ScanDirectory(previousDirectory);
+        var currentManifest = ScanDirectory(currentDirectory);
+        var fileEntries = BuildFileEntries(previousManifest, currentManifest, repoRoot, options.RepoBaseUrl);
+        var installerMirrors = BuildInstallerMirrors(options.Platform, installerMirrorRoot, options.InstallerDirectory, options.InstallerBaseUrl);
+        var publishedAt = DateTimeOffset.UtcNow;
+
+        var fileMap = new FileMapDocument(
+            FormatVersion: "1.0",
+            DistributionId: distributionId,
+            FromVersion: options.PreviousVersion,
+            ToVersion: options.CurrentVersion,
+            Platform: options.Platform,
+            Channel: options.Channel,
+            PublishedAt: publishedAt,
+            Capabilities: ["file-object"],
+            Components:
+            [
+                new ComponentDocument(
+                    Id: "app",
+                    Root: "/",
+                    Mode: "file-object",
+                    Files: fileEntries,
+                    Metadata: new Dictionary<string, string> { ["component"] = "app" })
+            ],
+            Metadata: new Dictionary<string, string>
+            {
+                ["protocol"] = "PLONDS",
+                ["mode"] = "file-object"
+            });
+
+        var distribution = new DistributionDocument(
+            DistributionId: distributionId,
+            Version: options.CurrentVersion,
+            Channel: options.Channel,
+            Platform: options.Platform,
+            PublishedAt: publishedAt,
+            FileMapUrl: options.FileMapUrl,
+            FileMapSignatureUrl: options.FileMapSignatureUrl,
+            Components: fileMap.Components,
+            InstallerMirrors: installerMirrors,
+            Capabilities: ["file-object"],
+            Metadata: new Dictionary<string, string> { ["protocol"] = "PLONDS" });
+
+        var latest = new LatestPointerDocument(
+            DistributionId: distributionId,
+            Version: options.CurrentVersion,
+            Channel: options.Channel,
+            Platform: options.Platform,
+            PublishedAt: publishedAt);
+
+        var fileMapPath = Path.Combine(manifestsRoot, "plonds-filemap.json");
+        var distributionPath = Path.Combine(metaDistributionRoot, distributionId + ".json");
+        var latestPath = Path.Combine(metaChannelRoot, "latest.json");
+
+        WriteJson(fileMapPath, fileMap);
+        WriteJson(distributionPath, distribution);
+        WriteJson(latestPath, latest);
+
+        return new PlatformPublishResult(
+            options.Platform,
+            distributionId,
+            currentDirectory,
+            previousDirectory,
+            options.PreviousVersion,
+            fileMapPath,
+            fileMapPath + ".sig",
+            distributionPath,
+            latestPath,
+            installerMirrors.Select(x => x.FileName ?? string.Empty).Where(x => !string.IsNullOrWhiteSpace(x)).ToArray());
+    }
+
+    private static Dictionary<string, FileFingerprint> ScanDirectory(string? root)
+    {
+        var manifest = new Dictionary<string, FileFingerprint>(StringComparer.OrdinalIgnoreCase);
+        if (string.IsNullOrWhiteSpace(root) || !Directory.Exists(root))
+        {
+            return manifest;
+        }
+
+        var resolvedRoot = Path.GetFullPath(root);
+        foreach (var filePath in Directory.EnumerateFiles(resolvedRoot, "*", SearchOption.AllDirectories))
+        {
+            var relativePath = Path.GetRelativePath(resolvedRoot, filePath).Replace('\\', '/');
+            if (ShouldIgnore(relativePath))
+            {
+                continue;
+            }
+
+            var fileInfo = new FileInfo(filePath);
+            manifest[relativePath] = new FileFingerprint(relativePath, filePath, ComputeSha256(filePath), fileInfo.Length);
+        }
+
+        return manifest;
+    }
+
+    private static List<FileEntryDocument> BuildFileEntries(
+        Dictionary<string, FileFingerprint> previousManifest,
+        Dictionary<string, FileFingerprint> currentManifest,
+        string repoRoot,
+        string? repoBaseUrl)
+    {
+        var entries = new List<FileEntryDocument>();
+
+        foreach (var path in currentManifest.Keys.OrderBy(x => x, StringComparer.OrdinalIgnoreCase))
+        {
+            var current = currentManifest[path];
+            if (previousManifest.TryGetValue(path, out var previous) &&
+                string.Equals(current.Sha256, previous.Sha256, StringComparison.OrdinalIgnoreCase))
+            {
+                entries.Add(new FileEntryDocument(
+                    Path: path,
+                    Action: "reuse",
+                    Sha256: current.Sha256,
+                    Size: current.Size,
+                    Mode: "file-object",
+                    ObjectKey: null,
+                    ObjectUrl: null,
+                    Metadata: null));
+                continue;
+            }
+
+            var action = previousManifest.ContainsKey(path) ? "replace" : "add";
+            var objectKey = CopyContentObject(current.FullPath, repoRoot, current.Sha256);
+            var objectUrl = string.IsNullOrWhiteSpace(repoBaseUrl)
+                ? null
+                : $"{repoBaseUrl.TrimEnd('/')}/{objectKey}";
+
+            entries.Add(new FileEntryDocument(
+                Path: path,
+                Action: action,
+                Sha256: current.Sha256,
+                Size: current.Size,
+                Mode: "file-object",
+                ObjectKey: objectKey,
+                ObjectUrl: objectUrl,
+                Metadata: new Dictionary<string, string> { ["mode"] = "file-object" }));
+        }
+
+        foreach (var path in previousManifest.Keys.OrderBy(x => x, StringComparer.OrdinalIgnoreCase))
+        {
+            if (!currentManifest.ContainsKey(path))
+            {
+                entries.Add(new FileEntryDocument(
+                    Path: path,
+                    Action: "delete",
+                    Sha256: string.Empty,
+                    Size: 0,
+                    Mode: "file-object",
+                    ObjectKey: null,
+                    ObjectUrl: null,
+                    Metadata: null));
+            }
+        }
+
+        return entries;
+    }
+
+    private static List<InstallerMirrorDocument> BuildInstallerMirrors(
+        string platform,
+        string installerMirrorRoot,
+        string? installerSourceDirectory,
+        string? installerBaseUrl)
+    {
+        var result = new List<InstallerMirrorDocument>();
+        if (string.IsNullOrWhiteSpace(installerSourceDirectory) || !Directory.Exists(installerSourceDirectory))
+        {
+            return result;
+        }
+
+        Directory.CreateDirectory(installerMirrorRoot);
+        foreach (var sourceFile in Directory.EnumerateFiles(installerSourceDirectory))
+        {
+            var fileName = Path.GetFileName(sourceFile);
+            var destinationPath = Path.Combine(installerMirrorRoot, fileName);
+            File.Copy(sourceFile, destinationPath, overwrite: true);
+
+            var url = string.IsNullOrWhiteSpace(installerBaseUrl)
+                ? null
+                : $"{installerBaseUrl.TrimEnd('/')}/{Uri.EscapeDataString(fileName)}";
+            result.Add(new InstallerMirrorDocument(
+                Platform: platform,
+                Arch: ResolveArch(platform),
+                Url: url,
+                FileName: fileName,
+                Sha256: ComputeSha256(destinationPath),
+                Size: new FileInfo(destinationPath).Length));
+        }
+
+        return result;
+    }
+
+    private static string ResolveArch(string platform)
+    {
+        if (platform.EndsWith("-x86", StringComparison.OrdinalIgnoreCase))
+        {
+            return "x86";
+        }
+
+        if (platform.EndsWith("-arm64", StringComparison.OrdinalIgnoreCase))
+        {
+            return "arm64";
+        }
+
+        return "x64";
+    }
+
+    private static bool ShouldIgnore(string relativePath)
+    {
+        var normalized = relativePath.Trim().Replace('\\', '/');
+        if (string.IsNullOrWhiteSpace(normalized))
+        {
+            return true;
+        }
+
+        return normalized.Equals(".current", StringComparison.OrdinalIgnoreCase) ||
+               normalized.Equals(".partial", StringComparison.OrdinalIgnoreCase) ||
+               normalized.Equals(".destroy", StringComparison.OrdinalIgnoreCase) ||
+               normalized.StartsWith(".current/", StringComparison.OrdinalIgnoreCase) ||
+               normalized.StartsWith(".partial/", StringComparison.OrdinalIgnoreCase) ||
+               normalized.StartsWith(".destroy/", StringComparison.OrdinalIgnoreCase);
+    }
+
+    private static string CopyContentObject(string sourcePath, string repoRoot, string sha256)
+    {
+        var prefix = sha256[..Math.Min(2, sha256.Length)];
+        var relativeKey = $"{prefix}/{sha256}";
+        var destinationPath = Path.Combine(repoRoot, prefix, sha256);
+        Directory.CreateDirectory(Path.GetDirectoryName(destinationPath)!);
+        if (!File.Exists(destinationPath))
+        {
+            File.Copy(sourcePath, destinationPath, overwrite: true);
+        }
+
+        return relativeKey.Replace('\\', '/');
+    }
+
+    private static string ComputeSha256(string filePath)
+    {
+        using var stream = File.OpenRead(filePath);
+        return Convert.ToHexString(SHA256.HashData(stream)).ToLowerInvariant();
+    }
+
+    private static void WriteJson<T>(string path, T value)
+    {
+        var json = JsonSerializer.Serialize(value, JsonOptions);
+        File.WriteAllText(path, json, new UTF8Encoding(false));
+    }
+
+    private sealed record FileFingerprint(string RelativePath, string FullPath, string Sha256, long Size);
+
+    private sealed record FileMapDocument(
+        string FormatVersion,
+        string DistributionId,
+        string FromVersion,
+        string ToVersion,
+        string Platform,
+        string Channel,
+        DateTimeOffset PublishedAt,
+        IReadOnlyList<string> Capabilities,
+        IReadOnlyList<ComponentDocument> Components,
+        IReadOnlyDictionary<string, string>? Metadata);
+
+    private sealed record DistributionDocument(
+        string DistributionId,
+        string Version,
+        string Channel,
+        string Platform,
+        DateTimeOffset PublishedAt,
+        string? FileMapUrl,
+        string? FileMapSignatureUrl,
+        IReadOnlyList<ComponentDocument> Components,
+        IReadOnlyList<InstallerMirrorDocument> InstallerMirrors,
+        IReadOnlyList<string> Capabilities,
+        IReadOnlyDictionary<string, string>? Metadata);
+
+    private sealed record LatestPointerDocument(
+        string DistributionId,
+        string Version,
+        string Channel,
+        string Platform,
+        DateTimeOffset PublishedAt);
+
+    private sealed record ComponentDocument(
+        string Id,
+        string Root,
+        string Mode,
+        IReadOnlyList<FileEntryDocument> Files,
+        IReadOnlyDictionary<string, string>? Metadata);
+
+    private sealed record FileEntryDocument(
+        string Path,
+        string Action,
+        string Sha256,
+        long Size,
+        string Mode,
+        string? ObjectKey,
+        string? ObjectUrl,
+        IReadOnlyDictionary<string, string>? Metadata);
+
+    private sealed record InstallerMirrorDocument(
+        string Platform,
+        string Arch,
+        string? Url,
+        string? FileName,
+        string? Sha256,
+        long Size);
+}

PenguinLogisticsOnlineNetworkDistributionSystem/src/Plonds.Core/Publishing/PlondsPublishOptions.cs

@@ -0,0 +1,12 @@
+namespace Plonds.Core.Publishing;
+
+public sealed record PlondsPublishOptions(
+    string Version,
+    string AppArtifactsRoot,
+    string InstallerArtifactsRoot,
+    string OutputRoot,
+    string PrivateKeyPath,
+    string Channel = "stable",
+    string? BaselineRoot = null,
+    string? RepoBaseUrl = null,
+    string? InstallerBaseUrl = null);

PenguinLogisticsOnlineNetworkDistributionSystem/src/Plonds.Core/Publishing/PlondsPublisher.cs

@@ -0,0 +1,230 @@
+using System.Text;
+using System.Text.Json;
+using Plonds.Core.Security;
+using Plonds.Shared;
+using Plonds.Shared.Models;
+
+namespace Plonds.Core.Publishing;
+
+public sealed class PlondsPublisher
+{
+    private static readonly PlatformConfig[] SupportedPlatforms =
+    [
+        new("windows-x64", "app-payload-windows-x64", [".exe"], ["x64"]),
+        new("windows-x86", "app-payload-windows-x86", [".exe"], ["x86"]),
+        new("linux-x64", "app-payload-linux-x64", [".deb"], ["linux", "x64"])
+    ];
+
+    private static readonly JsonSerializerOptions JsonOptions = new()
+    {
+        PropertyNamingPolicy = JsonNamingPolicy.CamelCase,
+        WriteIndented = true
+    };
+
+    private readonly PlondsGenerator _generator = new();
+    private readonly RsaFileSigner _signer = new();
+
+    public IReadOnlyList<PlatformPublishResult> Publish(PlondsPublishOptions options)
+    {
+        ArgumentNullException.ThrowIfNull(options);
+
+        var results = new List<PlatformPublishResult>();
+        var releaseAssetsRoot = Path.Combine(Path.GetFullPath(options.OutputRoot), "release-assets");
+        Directory.CreateDirectory(releaseAssetsRoot);
+
+        foreach (var config in SupportedPlatforms)
+        {
+            var artifactRoot = Path.Combine(Path.GetFullPath(options.AppArtifactsRoot), config.ArtifactName);
+            if (!Directory.Exists(artifactRoot))
+            {
+                throw new DirectoryNotFoundException($"App payload artifact root not found for {config.Platform}: {artifactRoot}");
+            }
+
+            var currentAppDirectory = FindCurrentAppDirectory(artifactRoot, options.Version);
+            if (currentAppDirectory is null)
+            {
+                throw new DirectoryNotFoundException($"Unable to locate app payload directory for {config.Platform} under {artifactRoot}");
+            }
+
+            var baselineRoot = string.IsNullOrWhiteSpace(options.BaselineRoot)
+                ? Path.Combine(Path.GetFullPath(options.OutputRoot), "_baselines")
+                : Path.GetFullPath(options.BaselineRoot);
+            var platformBaselineRoot = Path.Combine(baselineRoot, config.Platform);
+            var previousDirectory = Path.Combine(platformBaselineRoot, "current");
+            var previousVersionPath = Path.Combine(platformBaselineRoot, "version.txt");
+            Directory.CreateDirectory(platformBaselineRoot);
+            if (!Directory.Exists(previousDirectory))
+            {
+                Directory.CreateDirectory(previousDirectory);
+            }
+
+            var previousVersion = File.Exists(previousVersionPath)
+                ? File.ReadAllText(previousVersionPath).Trim()
+                : "0.0.0";
+
+            var installerSourceDirectory = PrepareInstallerMirrorInput(
+                config,
+                options.InstallerArtifactsRoot,
+                Path.Combine(platformBaselineRoot, "installers"));
+
+            var distributionId = $"plonds-{options.Version}-{config.Platform}";
+            var repoBaseUrl = options.RepoBaseUrl;
+            var fileMapUrl = repoBaseUrl is null
+                ? null
+                : $"{repoBaseUrl.TrimEnd('/').Replace("/repo/sha256", "/manifests")}/{distributionId}/plonds-filemap.json";
+            var fileMapSignatureUrl = fileMapUrl is null ? null : fileMapUrl + ".sig";
+            var installerBaseUrl = string.IsNullOrWhiteSpace(options.InstallerBaseUrl)
+                ? null
+                : $"{options.InstallerBaseUrl.TrimEnd('/')}/{config.Platform}/{options.Version}";
+
+            var result = _generator.Generate(new PlondsGenerateOptions(
+                CurrentVersion: options.Version,
+                CurrentDirectory: currentAppDirectory,
+                Platform: config.Platform,
+                OutputRoot: options.OutputRoot,
+                PreviousVersion: previousVersion,
+                PreviousDirectory: previousDirectory,
+                Channel: options.Channel,
+                DistributionId: distributionId,
+                RepoBaseUrl: repoBaseUrl,
+                FileMapUrl: fileMapUrl,
+                FileMapSignatureUrl: fileMapSignatureUrl,
+                InstallerDirectory: installerSourceDirectory,
+                InstallerBaseUrl: installerBaseUrl));
+
+            _signer.SignFile(result.FileMapPath, options.PrivateKeyPath, result.SignaturePath);
+
+            CopyReleaseAsset(result.FileMapPath, Path.Combine(releaseAssetsRoot, $"plonds-filemap-{config.Platform}.json"));
+            CopyReleaseAsset(result.SignaturePath, Path.Combine(releaseAssetsRoot, $"plonds-filemap-{config.Platform}.json.sig"));
+            CopyReleaseAsset(result.DistributionPath, Path.Combine(releaseAssetsRoot, $"plonds-distribution-{config.Platform}.json"));
+            CopyReleaseAsset(result.LatestPath, Path.Combine(releaseAssetsRoot, $"plonds-latest-{config.Platform}.json"));
+
+            MirrorBaseline(currentAppDirectory, previousDirectory, previousVersionPath, options.Version);
+            results.Add(result);
+        }
+
+        WriteMetadataCatalog(options, results);
+        return results;
+    }
+
+    private static void WriteMetadataCatalog(PlondsPublishOptions options, IReadOnlyList<PlatformPublishResult> results)
+    {
+        var outputRoot = Path.GetFullPath(options.OutputRoot);
+        var metadataRoot = Path.Combine(outputRoot, "meta");
+        Directory.CreateDirectory(metadataRoot);
+
+        var generatedAt = DateTimeOffset.UtcNow;
+        var latestPointers = results
+            .Select(result => new PlondsChannelPointer(
+                Channel: options.Channel,
+                Platform: result.Platform,
+                DistributionId: result.DistributionId,
+                Version: options.Version,
+                PublishedAt: generatedAt,
+                DistributionPath: $"distributions/{result.DistributionId}.json",
+                FileMapPath: $"../manifests/{result.DistributionId}/plonds-filemap.json"))
+            .OrderBy(pointer => pointer.Channel, StringComparer.OrdinalIgnoreCase)
+            .ThenBy(pointer => pointer.Platform, StringComparer.OrdinalIgnoreCase)
+            .ToArray();
+
+        var catalog = new PlondsMetadataCatalog(
+            ProtocolName: PlondsConstants.ProtocolName,
+            ProtocolVersion: PlondsConstants.ProtocolVersion,
+            StorageRoot: outputRoot,
+            MetaRoot: metadataRoot,
+            Latest: latestPointers,
+            Metadata: new Dictionary<string, string>
+            {
+                ["generatedBy"] = "Plonds.Tool",
+                ["channel"] = options.Channel,
+                ["generatedAt"] = generatedAt.ToString("O")
+            });
+
+        var metadataPath = Path.Combine(metadataRoot, "metadata.json");
+        File.WriteAllText(metadataPath, JsonSerializer.Serialize(catalog, JsonOptions), new UTF8Encoding(false));
+    }
+
+    private static void MirrorBaseline(string currentAppDirectory, string previousDirectory, string previousVersionPath, string version)
+    {
+        if (Directory.Exists(previousDirectory))
+        {
+            Directory.Delete(previousDirectory, recursive: true);
+        }
+
+        CopyDirectory(currentAppDirectory, previousDirectory);
+        File.WriteAllText(previousVersionPath, version);
+    }
+
+    private static string? FindCurrentAppDirectory(string artifactRoot, string version)
+    {
+        var preferred = Directory.EnumerateDirectories(artifactRoot, $"app-{version}", SearchOption.AllDirectories).FirstOrDefault();
+        if (preferred is not null)
+        {
+            return preferred;
+        }
+
+        return Directory.EnumerateDirectories(artifactRoot, "app-*", SearchOption.AllDirectories)
+            .OrderBy(x => x, StringComparer.OrdinalIgnoreCase)
+            .FirstOrDefault();
+    }
+
+    private static string PrepareInstallerMirrorInput(PlatformConfig config, string installerArtifactsRoot, string destinationRoot)
+    {
+        var installerFiles = FindInstallerFiles(config, installerArtifactsRoot);
+        if (Directory.Exists(destinationRoot))
+        {
+            Directory.Delete(destinationRoot, recursive: true);
+        }
+        Directory.CreateDirectory(destinationRoot);
+
+        foreach (var file in installerFiles)
+        {
+            File.Copy(file, Path.Combine(destinationRoot, Path.GetFileName(file)), overwrite: true);
+        }
+
+        return destinationRoot;
+    }
+
+    private static List<string> FindInstallerFiles(PlatformConfig config, string installerArtifactsRoot)
+    {
+        var files = Directory.EnumerateFiles(Path.GetFullPath(installerArtifactsRoot), "*", SearchOption.AllDirectories);
+        return files
+            .Where(file => config.InstallerExtensions.Contains(Path.GetExtension(file), StringComparer.OrdinalIgnoreCase))
+            .Where(file =>
+            {
+                var fileName = Path.GetFileName(file);
+                return config.FileNameTokens.All(token => fileName.Contains(token, StringComparison.OrdinalIgnoreCase));
+            })
+            .ToList();
+    }
+
+    private static void CopyReleaseAsset(string sourcePath, string destinationPath)
+    {
+        Directory.CreateDirectory(Path.GetDirectoryName(destinationPath)!);
+        File.Copy(sourcePath, destinationPath, overwrite: true);
+    }
+
+    private static void CopyDirectory(string sourceDir, string destinationDir)
+    {
+        Directory.CreateDirectory(destinationDir);
+        foreach (var directory in Directory.EnumerateDirectories(sourceDir, "*", SearchOption.AllDirectories))
+        {
+            var relativePath = Path.GetRelativePath(sourceDir, directory);
+            Directory.CreateDirectory(Path.Combine(destinationDir, relativePath));
+        }
+
+        foreach (var file in Directory.EnumerateFiles(sourceDir, "*", SearchOption.AllDirectories))
+        {
+            var relativePath = Path.GetRelativePath(sourceDir, file);
+            var destinationPath = Path.Combine(destinationDir, relativePath);
+            Directory.CreateDirectory(Path.GetDirectoryName(destinationPath)!);
+            File.Copy(file, destinationPath, overwrite: true);
+        }
+    }
+
+    private sealed record PlatformConfig(
+        string Platform,
+        string ArtifactName,
+        IReadOnlyList<string> InstallerExtensions,
+        IReadOnlyList<string> FileNameTokens);
+}

PenguinLogisticsOnlineNetworkDistributionSystem/src/Plonds.Core/Security/RsaFileSigner.cs

@@ -0,0 +1,38 @@
+using System.Security.Cryptography;
+using System.Text;
+
+namespace Plonds.Core.Security;
+
+public sealed class RsaFileSigner
+{
+    public string SignFile(string filePath, string privateKeyPath, string? outputPath = null)
+    {
+        ArgumentException.ThrowIfNullOrWhiteSpace(filePath);
+        ArgumentException.ThrowIfNullOrWhiteSpace(privateKeyPath);
+
+        if (!File.Exists(filePath))
+        {
+            throw new FileNotFoundException("Manifest file not found.", filePath);
+        }
+
+        if (!File.Exists(privateKeyPath))
+        {
+            throw new FileNotFoundException("Private key PEM file not found.", privateKeyPath);
+        }
+
+        outputPath ??= filePath + ".sig";
+
+        var payload = File.ReadAllBytes(filePath);
+        var privateKeyPem = File.ReadAllText(privateKeyPath, Encoding.ASCII);
+        if (string.IsNullOrWhiteSpace(privateKeyPem))
+        {
+            throw new InvalidOperationException("Private key PEM is empty.");
+        }
+
+        using var rsa = RSA.Create();
+        rsa.ImportFromPem(privateKeyPem);
+        var signature = rsa.SignData(payload, HashAlgorithmName.SHA256, RSASignaturePadding.Pkcs1);
+        File.WriteAllText(outputPath, Convert.ToBase64String(signature), Encoding.ASCII);
+        return outputPath;
+    }
+}

PenguinLogisticsOnlineNetworkDistributionSystem/src/Plonds.Shared/Models/PlondsChannelPointer.cs

@@ -0,0 +1,11 @@
+namespace Plonds.Shared.Models;
+
+public sealed record PlondsChannelPointer(
+    string Channel,
+    string Platform,
+    string DistributionId,
+    string Version,
+    DateTimeOffset PublishedAt,
+    string? DistributionPath = null,
+    string? FileMapPath = null);
+

PenguinLogisticsOnlineNetworkDistributionSystem/src/Plonds.Shared/Models/PlondsComponent.cs

@@ -0,0 +1,9 @@
+namespace Plonds.Shared.Models;
+
+public sealed record PlondsComponent(
+    string Id,
+    string Root,
+    string Mode,
+    IReadOnlyList<PlondsFileEntry> Files,
+    IReadOnlyDictionary<string, string>? Metadata = null);
+

PenguinLogisticsOnlineNetworkDistributionSystem/src/Plonds.Shared/Models/PlondsDistributionInfo.cs

@@ -0,0 +1,14 @@
+namespace Plonds.Shared.Models;
+
+public sealed record PlondsDistributionInfo(
+    string DistributionId,
+    string Version,
+    string Channel,
+    string Platform,
+    DateTimeOffset PublishedAt,
+    IReadOnlyList<PlondsComponent> Components,
+    IReadOnlyList<PlondsMirrorAsset> InstallerMirrors,
+    IReadOnlyList<string> Capabilities,
+    IReadOnlyList<PlondsSignatureDescriptor> Signatures,
+    IReadOnlyDictionary<string, string>? Metadata = null);
+

PenguinLogisticsOnlineNetworkDistributionSystem/src/Plonds.Shared/Models/PlondsFileEntry.cs

@@ -0,0 +1,13 @@
+namespace Plonds.Shared.Models;
+
+public sealed record PlondsFileEntry(
+    string Path,
+    string Op,
+    string ContentHash,
+    long Size,
+    string Mode,
+    string? ObjectKey = null,
+    string? Compression = null,
+    string? PatchBaseHash = null,
+    string? PatchObjectKey = null);
+

PenguinLogisticsOnlineNetworkDistributionSystem/src/Plonds.Shared/Models/PlondsFileMap.cs

@@ -0,0 +1,13 @@
+namespace Plonds.Shared.Models;
+
+public sealed record PlondsFileMap(
+    string FormatVersion,
+    string DistributionId,
+    string SourceVersion,
+    string TargetVersion,
+    string Platform,
+    IReadOnlyList<PlondsComponent> Components,
+    IReadOnlyList<string> Capabilities,
+    IReadOnlyList<PlondsSignatureDescriptor> Signatures,
+    IReadOnlyDictionary<string, string>? Metadata = null);
+

PenguinLogisticsOnlineNetworkDistributionSystem/src/Plonds.Shared/Models/PlondsMetadataCatalog.cs

@@ -0,0 +1,10 @@
+namespace Plonds.Shared.Models;
+
+public sealed record PlondsMetadataCatalog(
+    string ProtocolName,
+    string ProtocolVersion,
+    string StorageRoot,
+    string MetaRoot,
+    IReadOnlyList<PlondsChannelPointer> Latest,
+    IReadOnlyDictionary<string, string>? Metadata = null);
+

PenguinLogisticsOnlineNetworkDistributionSystem/src/Plonds.Shared/Models/PlondsMirrorAsset.cs

@@ -0,0 +1,9 @@
+namespace Plonds.Shared.Models;
+
+public sealed record PlondsMirrorAsset(
+    string Platform,
+    string Arch,
+    string Url,
+    string? FileName = null,
+    string? Sha256 = null,
+    long Size = 0);

PenguinLogisticsOnlineNetworkDistributionSystem/src/Plonds.Shared/Models/PlondsSignatureDescriptor.cs

@@ -0,0 +1,7 @@
+namespace Plonds.Shared.Models;
+
+public sealed record PlondsSignatureDescriptor(
+    string Algorithm,
+    string KeyId,
+    string Signature);
+

PenguinLogisticsOnlineNetworkDistributionSystem/src/Plonds.Shared/Plonds.Shared.csproj

@@ -0,0 +1,6 @@
+<Project Sdk="Microsoft.NET.Sdk">
+  <PropertyGroup>
+    <RootNamespace>Plonds.Shared</RootNamespace>
+  </PropertyGroup>
+</Project>
+

PenguinLogisticsOnlineNetworkDistributionSystem/src/Plonds.Shared/PlondsConstants.cs

@@ -0,0 +1,25 @@
+namespace Plonds.Shared;
+
+public static class PlondsConstants
+{
+    public const string ProtocolName = "PLONDS";
+    public const string ProtocolVersion = "1.0";
+
+    public const string DefaultApiBasePath = "/api/plonds/v1";
+    public const string DefaultStorageRoot = "sample-data";
+    public const string DefaultMetaRoot = "meta";
+    public const string DefaultRepoRoot = "repo";
+    public const string DefaultInstallersRoot = "installers";
+
+    public const string FileObjectMode = "file-object";
+    public const string CompressedObjectMode = "compressed-object";
+    public const string BinaryPatchMode = "binary-patch";
+
+    public static readonly string[] SupportedFileModes =
+    [
+        FileObjectMode,
+        CompressedObjectMode,
+        BinaryPatchMode
+    ];
+}
+

PenguinLogisticsOnlineNetworkDistributionSystem/src/Plonds.Shared/PlondsFileOperation.cs

@@ -0,0 +1,10 @@
+namespace Plonds.Shared;
+
+public enum PlondsFileOperation
+{
+    Add,
+    Replace,
+    Reuse,
+    Delete
+}
+

PenguinLogisticsOnlineNetworkDistributionSystem/src/Plonds.Tool/Plonds.Tool.csproj

@@ -0,0 +1,9 @@
+<Project Sdk="Microsoft.NET.Sdk">
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+  </PropertyGroup>
+  <ItemGroup>
+    <ProjectReference Include="..\Plonds.Core\Plonds.Core.csproj" />
+    <ProjectReference Include="..\Plonds.Shared\Plonds.Shared.csproj" />
+  </ItemGroup>
+</Project>

PenguinLogisticsOnlineNetworkDistributionSystem/src/Plonds.Tool/Program.cs

@@ -0,0 +1,142 @@
+using Plonds.Core.Publishing;
+using Plonds.Core.Security;
+
+return await PlondsCli.RunAsync(args);
+
+internal static class PlondsCli
+{
+    public static Task<int> RunAsync(string[] args)
+    {
+        if (args.Length == 0)
+        {
+            PrintUsage();
+            return Task.FromResult(1);
+        }
+
+        var command = args[0].Trim().ToLowerInvariant();
+        var options = ParseOptions(args.Skip(1).ToArray());
+
+        try
+        {
+            switch (command)
+            {
+                case "generate":
+                    RunGenerate(options);
+                    return Task.FromResult(0);
+                case "sign":
+                    RunSign(options);
+                    return Task.FromResult(0);
+                case "publish":
+                    RunPublish(options);
+                    return Task.FromResult(0);
+                default:
+                    Console.Error.WriteLine($"Unknown command: {command}");
+                    PrintUsage();
+                    return Task.FromResult(1);
+            }
+        }
+        catch (Exception ex)
+        {
+            Console.Error.WriteLine(ex.Message);
+            return Task.FromResult(1);
+        }
+    }
+
+    private static void RunGenerate(Dictionary<string, string> options)
+    {
+        var generator = new PlondsGenerator();
+        var result = generator.Generate(new PlondsGenerateOptions(
+            CurrentVersion: Require(options, "current-version"),
+            CurrentDirectory: Require(options, "current-dir"),
+            Platform: Require(options, "platform"),
+            OutputRoot: Require(options, "output-dir"),
+            PreviousVersion: Get(options, "previous-version", "0.0.0") ?? "0.0.0",
+            PreviousDirectory: Get(options, "previous-dir"),
+            Channel: Get(options, "channel", "stable") ?? "stable",
+            DistributionId: Get(options, "distribution-id"),
+            RepoBaseUrl: Get(options, "repo-base-url"),
+            FileMapUrl: Get(options, "file-map-url"),
+            FileMapSignatureUrl: Get(options, "file-map-signature-url"),
+            InstallerDirectory: Get(options, "installer-directory"),
+            InstallerBaseUrl: Get(options, "installer-base-url")));
+
+        Console.WriteLine($"Generated PLONDS artifacts for {result.Platform}: {result.DistributionId}");
+        Console.WriteLine(result.FileMapPath);
+    }
+
+    private static void RunSign(Dictionary<string, string> options)
+    {
+        var signer = new RsaFileSigner();
+        var signaturePath = signer.SignFile(
+            Require(options, "manifest"),
+            Require(options, "private-key"),
+            Get(options, "output"));
+        Console.WriteLine(signaturePath);
+    }
+
+    private static void RunPublish(Dictionary<string, string> options)
+    {
+        var publisher = new PlondsPublisher();
+        var results = publisher.Publish(new PlondsPublishOptions(
+            Version: Require(options, "version"),
+            AppArtifactsRoot: Require(options, "app-artifacts-root"),
+            InstallerArtifactsRoot: Require(options, "installer-artifacts-root"),
+            OutputRoot: Require(options, "output-dir"),
+            PrivateKeyPath: Require(options, "private-key"),
+            Channel: Get(options, "channel", "stable") ?? "stable",
+            BaselineRoot: Get(options, "baseline-root"),
+            RepoBaseUrl: Get(options, "repo-base-url"),
+            InstallerBaseUrl: Get(options, "installer-base-url")));
+
+        foreach (var result in results)
+        {
+            Console.WriteLine($"{result.Platform}: {result.DistributionId}");
+        }
+    }
+
+    private static Dictionary<string, string> ParseOptions(string[] args)
+    {
+        var result = new Dictionary<string, string>(StringComparer.OrdinalIgnoreCase);
+        for (var index = 0; index < args.Length; index++)
+        {
+            var token = args[index];
+            if (!token.StartsWith("--", StringComparison.Ordinal))
+            {
+                continue;
+            }
+
+            var key = token[2..];
+            var value = index + 1 < args.Length && !args[index + 1].StartsWith("--", StringComparison.Ordinal)
+                ? args[++index]
+                : "true";
+            result[key] = value;
+        }
+
+        return result;
+    }
+
+    private static string Require(IReadOnlyDictionary<string, string> options, string key)
+    {
+        if (options.TryGetValue(key, out var value) && !string.IsNullOrWhiteSpace(value))
+        {
+            return value;
+        }
+
+        throw new InvalidOperationException($"Missing required option --{key}");
+    }
+
+    private static string? Get(IReadOnlyDictionary<string, string> options, string key, string? defaultValue = null)
+    {
+        return options.TryGetValue(key, out var value) && !string.IsNullOrWhiteSpace(value)
+            ? value
+            : defaultValue;
+    }
+
+    private static void PrintUsage()
+    {
+        Console.WriteLine("PLONDS Tool");
+        Console.WriteLine("  generate --current-version <v> --current-dir <dir> --platform <platform> --output-dir <dir> [--previous-version <v>] [--previous-dir <dir>]");
+        Console.WriteLine("  sign --manifest <file> --private-key <pem> [--output <file>]");
+        Console.WriteLine("  publish --version <v> --app-artifacts-root <dir> --installer-artifacts-root <dir> --output-dir <dir> --private-key <pem> [--baseline-root <dir>]");
+    }
+}

scripts/Generate-PlondsArtifacts.ps1

@@ -0,0 +1,87 @@
+param(
+    [Parameter(Mandatory = $true)]
+    [string]$CurrentVersion,
+
+    [Parameter(Mandatory = $true)]
+    [string]$CurrentDir,
+
+    [Parameter(Mandatory = $true)]
+    [string]$Platform,
+
+    [Parameter(Mandatory = $true)]
+    [string]$OutputDir,
+
+    [Parameter(Mandatory = $false)]
+    [string]$PreviousVersion = "",
+
+    [Parameter(Mandatory = $false)]
+    [string]$PreviousDir = "",
+
+    [Parameter(Mandatory = $false)]
+    [string]$Channel = "stable",
+
+    [Parameter(Mandatory = $false)]
+    [string]$DistributionId = "",
+
+    [Parameter(Mandatory = $false)]
+    [string]$RepoBaseUrl = "",
+
+    [Parameter(Mandatory = $false)]
+    [string]$FileMapUrl = "",
+
+    [Parameter(Mandatory = $false)]
+    [string]$FileMapSignatureUrl = "",
+
+    [Parameter(Mandatory = $false)]
+    [string]$InstallerDirectory = "",
+
+    [Parameter(Mandatory = $false)]
+    [string]$InstallerBaseUrl = ""
+)
+
+$ErrorActionPreference = "Stop"
+
+$toolProject = Join-Path $PSScriptRoot "..\PenguinLogisticsOnlineNetworkDistributionSystem\src\Plonds.Tool\Plonds.Tool.csproj"
+if (-not (Test-Path -LiteralPath $toolProject)) {
+    throw "PLONDS tool project not found: $toolProject"
+}
+
+$arguments = @(
+    "run",
+    "--project", $toolProject,
+    "--",
+    "generate",
+    "--current-version", $CurrentVersion,
+    "--current-dir", $CurrentDir,
+    "--platform", $Platform,
+    "--output-dir", $OutputDir,
+    "--previous-version", $(if ([string]::IsNullOrWhiteSpace($PreviousVersion)) { "0.0.0" } else { $PreviousVersion }),
+    "--channel", $Channel
+)
+
+if (-not [string]::IsNullOrWhiteSpace($PreviousDir)) {
+    $arguments += @("--previous-dir", $PreviousDir)
+}
+if (-not [string]::IsNullOrWhiteSpace($DistributionId)) {
+    $arguments += @("--distribution-id", $DistributionId)
+}
+if (-not [string]::IsNullOrWhiteSpace($RepoBaseUrl)) {
+    $arguments += @("--repo-base-url", $RepoBaseUrl)
+}
+if (-not [string]::IsNullOrWhiteSpace($FileMapUrl)) {
+    $arguments += @("--file-map-url", $FileMapUrl)
+}
+if (-not [string]::IsNullOrWhiteSpace($FileMapSignatureUrl)) {
+    $arguments += @("--file-map-signature-url", $FileMapSignatureUrl)
+}
+if (-not [string]::IsNullOrWhiteSpace($InstallerDirectory)) {
+    $arguments += @("--installer-directory", $InstallerDirectory)
+}
+if (-not [string]::IsNullOrWhiteSpace($InstallerBaseUrl)) {
+    $arguments += @("--installer-base-url", $InstallerBaseUrl)
+}
+
+& dotnet @arguments
+if ($LASTEXITCODE -ne 0) {
+    throw "PLONDS generate command failed."
+}

scripts/Publish-Plonds.ps1

@@ -0,0 +1,301 @@
+param(
+    [Parameter(Mandatory = $true)]
+    [string]$Version,
+
+    [Parameter(Mandatory = $true)]
+    [string]$AppArtifactsRoot,
+
+    [Parameter(Mandatory = $true)]
+    [string]$InstallerArtifactsRoot,
+
+    [Parameter(Mandatory = $true)]
+    [string]$OutputDir,
+
+    [Parameter(Mandatory = $true)]
+    [string]$PrivateKeyPath,
+
+    [Parameter(Mandatory = $false)]
+    [string]$Channel = "stable",
+
+    [Parameter(Mandatory = $false)]
+    [string]$S3Endpoint = "",
+
+    [Parameter(Mandatory = $false)]
+    [string]$S3Bucket = "",
+
+    [Parameter(Mandatory = $false)]
+    [string]$S3Region = ""
+)
+
+$ErrorActionPreference = "Stop"
+
+function Get-PlatformConfigurations {
+    return @(
+        @{
+            Platform = "windows-x64"
+            ArtifactName = "app-payload-windows-x64"
+        },
+        @{
+            Platform = "windows-x86"
+            ArtifactName = "app-payload-windows-x86"
+        },
+        @{
+            Platform = "linux-x64"
+            ArtifactName = "app-payload-linux-x64"
+        }
+    )
+}
+
+function Resolve-AppDirectory {
+    param(
+        [Parameter(Mandatory = $true)]
+        [string]$SearchRoot,
+
+        [Parameter(Mandatory = $true)]
+        [string]$Version
+    )
+
+    $preferred = Get-ChildItem -LiteralPath $SearchRoot -Recurse -Directory -Filter "app-$Version" -ErrorAction SilentlyContinue |
+        Select-Object -First 1
+    if ($preferred) {
+        return $preferred.FullName
+    }
+
+    $fallback = Get-ChildItem -LiteralPath $SearchRoot -Recurse -Directory -Filter "app-*" -ErrorAction SilentlyContinue |
+        Sort-Object FullName |
+        Select-Object -First 1
+    return $fallback?.FullName
+}
+
+function Invoke-AwsSyncIfPossible {
+    param(
+        [Parameter(Mandatory = $true)]
+        [string[]]$Arguments,
+
+        [Parameter(Mandatory = $false)]
+        [switch]$IgnoreFailure
+    )
+
+    if ([string]::IsNullOrWhiteSpace($S3Endpoint) -or [string]::IsNullOrWhiteSpace($S3Bucket)) {
+        return
+    }
+
+    & aws @Arguments
+    if ($LASTEXITCODE -ne 0 -and -not $IgnoreFailure) {
+        throw "aws command failed: aws $($Arguments -join ' ')"
+    }
+}
+
+if (-not (Test-Path -LiteralPath $PrivateKeyPath)) {
+    throw "Private key file not found: $PrivateKeyPath"
+}
+
+$toolProject = Join-Path $PSScriptRoot "..\PenguinLogisticsOnlineNetworkDistributionSystem\src\Plonds.Tool\Plonds.Tool.csproj"
+if (-not (Test-Path -LiteralPath $toolProject)) {
+    throw "PLONDS tool project not found: $toolProject"
+}
+
+$supportedPlatforms = Get-PlatformConfigurations
+$publishedRoot = Join-Path $OutputDir "published"
+$releaseAssetsRoot = Join-Path $OutputDir "release-assets"
+$baselineRoot = Join-Path $OutputDir "_baselines"
+
+New-Item -ItemType Directory -Path $publishedRoot -Force | Out-Null
+New-Item -ItemType Directory -Path $releaseAssetsRoot -Force | Out-Null
+New-Item -ItemType Directory -Path $baselineRoot -Force | Out-Null
+
+foreach ($config in $supportedPlatforms) {
+    $platform = $config.Platform
+    $platformBaselineRoot = Join-Path $baselineRoot $platform
+    $baselineCurrentDir = Join-Path $platformBaselineRoot "current"
+    $baselineVersionPath = Join-Path $platformBaselineRoot "version.txt"
+
+    New-Item -ItemType Directory -Path $baselineCurrentDir -Force | Out-Null
+
+    if (-not [string]::IsNullOrWhiteSpace($S3Endpoint) -and -not [string]::IsNullOrWhiteSpace($S3Bucket)) {
+        Invoke-AwsSyncIfPossible -Arguments @(
+            "--endpoint-url", $S3Endpoint,
+            "--region", $S3Region,
+            "s3", "sync",
+            "s3://$S3Bucket/lanmountain/update/baselines/$platform/current/",
+            $baselineCurrentDir,
+            "--only-show-errors"
+        ) -IgnoreFailure
+
+        Invoke-AwsSyncIfPossible -Arguments @(
+            "--endpoint-url", $S3Endpoint,
+            "--region", $S3Region,
+            "s3", "cp",
+            "s3://$S3Bucket/lanmountain/update/baselines/$platform/version.txt",
+            $baselineVersionPath,
+            "--only-show-errors"
+        ) -IgnoreFailure
+    }
+}
+
+$repoBaseUrl = if ([string]::IsNullOrWhiteSpace($S3Endpoint) -or [string]::IsNullOrWhiteSpace($S3Bucket)) {
+    $null
+}
+else {
+    "$($S3Endpoint.TrimEnd('/'))/$S3Bucket/lanmountain/update/repo/sha256"
+}
+
+$installerBaseUrl = if ([string]::IsNullOrWhiteSpace($S3Endpoint) -or [string]::IsNullOrWhiteSpace($S3Bucket)) {
+    $null
+}
+else {
+    "$($S3Endpoint.TrimEnd('/'))/$S3Bucket/lanmountain/update/installers"
+}
+
+$legacySnapshots = @{}
+foreach ($config in $supportedPlatforms) {
+    $platform = $config.Platform
+    $platformBaselineRoot = Join-Path $baselineRoot $platform
+    $baselineCurrentDir = Join-Path $platformBaselineRoot "current"
+    $baselineVersionPath = Join-Path $platformBaselineRoot "version.txt"
+    $snapshotRoot = Join-Path $platformBaselineRoot "previous-snapshot"
+
+    if (Test-Path -LiteralPath $snapshotRoot) {
+        Remove-Item -LiteralPath $snapshotRoot -Recurse -Force
+    }
+    New-Item -ItemType Directory -Path $snapshotRoot -Force | Out-Null
+
+    $previousVersion = if (Test-Path -LiteralPath $baselineVersionPath) {
+        (Get-Content -LiteralPath $baselineVersionPath -Raw).Trim()
+    }
+    else {
+        "0.0.0"
+    }
+
+    $baselineHasContent = Get-ChildItem -LiteralPath $baselineCurrentDir -Force -ErrorAction SilentlyContinue | Select-Object -First 1
+    if ($baselineHasContent) {
+        Copy-Item -LiteralPath (Join-Path $baselineCurrentDir '*') -Destination $snapshotRoot -Recurse -Force
+        $snapshotDir = $snapshotRoot
+    }
+    else {
+        $snapshotDir = Join-Path $platformBaselineRoot "empty"
+        New-Item -ItemType Directory -Path $snapshotDir -Force | Out-Null
+    }
+
+    $legacySnapshots[$platform] = @{
+        PreviousVersion = $previousVersion
+        PreviousDir = $snapshotDir
+    }
+}
+
+$publishArguments = @(
+    "run",
+    "--project", $toolProject,
+    "--",
+    "publish",
+    "--version", $Version,
+    "--app-artifacts-root", $AppArtifactsRoot,
+    "--installer-artifacts-root", $InstallerArtifactsRoot,
+    "--output-dir", $publishedRoot,
+    "--private-key", $PrivateKeyPath,
+    "--baseline-root", $baselineRoot,
+    "--channel", $Channel
+)
+
+if (-not [string]::IsNullOrWhiteSpace($repoBaseUrl)) {
+    $publishArguments += @("--repo-base-url", $repoBaseUrl)
+}
+if (-not [string]::IsNullOrWhiteSpace($installerBaseUrl)) {
+    $publishArguments += @("--installer-base-url", $installerBaseUrl)
+}
+
+& dotnet @publishArguments
+if ($LASTEXITCODE -ne 0) {
+    throw "PLONDS publish command failed."
+}
+
+foreach ($config in $supportedPlatforms) {
+    $platform = $config.Platform
+    $artifactRoot = Join-Path $AppArtifactsRoot $config.ArtifactName
+    if (-not (Test-Path -LiteralPath $artifactRoot)) {
+        throw "App payload artifact root not found for ${platform}: $artifactRoot"
+    }
+
+    $currentAppDir = Resolve-AppDirectory -SearchRoot $artifactRoot -Version $Version
+    if ([string]::IsNullOrWhiteSpace($currentAppDir)) {
+        throw "Unable to locate app payload directory for $platform under $artifactRoot"
+    }
+
+    $distributionId = "plonds-$Version-$platform"
+    $manifestPath = Join-Path $publishedRoot "manifests/$distributionId/plonds-filemap.json"
+    $manifestSignaturePath = "$manifestPath.sig"
+
+    $legacyOutputDir = Join-Path $OutputDir "legacy/$platform"
+    New-Item -ItemType Directory -Path $legacyOutputDir -Force | Out-Null
+
+    $legacyState = $legacySnapshots[$platform]
+    & (Join-Path $PSScriptRoot "Generate-DeltaPackage.ps1") `
+        -PreviousVersion $legacyState.PreviousVersion `
+        -CurrentVersion $Version `
+        -PreviousDir $legacyState.PreviousDir `
+        -CurrentDir $currentAppDir `
+        -OutputDir $legacyOutputDir
+    if ($LASTEXITCODE -ne 0) {
+        throw "Generate-DeltaPackage.ps1 failed for $platform"
+    }
+
+    $legacyManifestPath = Join-Path $legacyOutputDir "files.json"
+    $legacySignaturePath = Join-Path $legacyOutputDir "files.json.sig"
+    & (Join-Path $PSScriptRoot "Sign-FileMap.ps1") `
+        -FilesJsonPath $legacyManifestPath `
+        -PrivateKeyPath $PrivateKeyPath `
+        -OutputPath $legacySignaturePath
+    if ($LASTEXITCODE -ne 0) {
+        throw "Failed to sign legacy manifest for $platform"
+    }
+
+    Copy-Item -LiteralPath $manifestPath -Destination (Join-Path $releaseAssetsRoot "plonds-filemap-$platform.json") -Force
+    Copy-Item -LiteralPath $manifestSignaturePath -Destination (Join-Path $releaseAssetsRoot "plonds-filemap-$platform.json.sig") -Force
+    Copy-Item -LiteralPath (Join-Path $publishedRoot "meta/distributions/$distributionId.json") -Destination (Join-Path $releaseAssetsRoot "plonds-distribution-$platform.json") -Force
+    Copy-Item -LiteralPath (Join-Path $publishedRoot "meta/channels/$Channel/$platform/latest.json") -Destination (Join-Path $releaseAssetsRoot "plonds-latest-$platform.json") -Force
+
+    Copy-Item -LiteralPath $legacyManifestPath -Destination (Join-Path $releaseAssetsRoot "files-$platform.json") -Force
+    Copy-Item -LiteralPath $legacySignaturePath -Destination (Join-Path $releaseAssetsRoot "files-$platform.json.sig") -Force
+    Copy-Item -LiteralPath (Join-Path $legacyOutputDir "update.zip") -Destination (Join-Path $releaseAssetsRoot "update-$platform.zip") -Force
+}
+
+if (-not [string]::IsNullOrWhiteSpace($S3Endpoint) -and -not [string]::IsNullOrWhiteSpace($S3Bucket)) {
+    Invoke-AwsSyncIfPossible -Arguments @(
+        "--endpoint-url", $S3Endpoint,
+        "--region", $S3Region,
+        "s3", "sync",
+        $publishedRoot,
+        "s3://$S3Bucket/lanmountain/update/",
+        "--only-show-errors"
+    )
+
+    foreach ($config in $supportedPlatforms) {
+        $platform = $config.Platform
+        $platformBaselineRoot = Join-Path $baselineRoot $platform
+        $baselineCurrentDir = Join-Path $platformBaselineRoot "current"
+        $baselineVersionPath = Join-Path $platformBaselineRoot "version.txt"
+
+        Invoke-AwsSyncIfPossible -Arguments @(
+            "--endpoint-url", $S3Endpoint,
+            "--region", $S3Region,
+            "s3", "sync",
+            $baselineCurrentDir,
+            "s3://$S3Bucket/lanmountain/update/baselines/$platform/current/",
+            "--delete",
+            "--only-show-errors"
+        )
+
+        Invoke-AwsSyncIfPossible -Arguments @(
+            "--endpoint-url", $S3Endpoint,
+            "--region", $S3Region,
+            "s3", "cp",
+            $baselineVersionPath,
+            "s3://$S3Bucket/lanmountain/update/baselines/$platform/version.txt",
+            "--only-show-errors"
+        )
+    }
+}
+
+Write-Host "PLONDS publish staging completed."
+Write-Host "Published root: $publishedRoot"
+Write-Host "Release assets: $releaseAssetsRoot"

scripts/Sign-FileMap.ps1

@@ -1,4 +1,4 @@
-param(
+param(
     [Parameter(Mandatory = $true)]
     [string]$FilesJsonPath,
 
@@ -11,46 +11,16 @@ param(
 
 $ErrorActionPreference = "Stop"
 
-if ($PSVersionTable.PSVersion.Major -lt 7) {
-    throw "Sign-FileMap.ps1 requires PowerShell 7 or newer."
-}
-
-if (-not (Test-Path -LiteralPath $FilesJsonPath)) {
-    throw "Manifest file not found: $FilesJsonPath"
-}
-
-if (-not (Test-Path -LiteralPath $PrivateKeyPath)) {
-    throw "Private key file not found: $PrivateKeyPath"
-}
-
 if ([string]::IsNullOrWhiteSpace($OutputPath)) {
     $OutputPath = "$FilesJsonPath.sig"
 }
 
-$resolvedManifestPath = (Resolve-Path -LiteralPath $FilesJsonPath).Path
-$manifestBytes = [System.IO.File]::ReadAllBytes($resolvedManifestPath)
-
-$privateKeyPem = Get-Content -LiteralPath $PrivateKeyPath -Raw
-if ([string]::IsNullOrWhiteSpace($privateKeyPem)) {
-    throw "Private key PEM is empty: $PrivateKeyPath"
+$toolProject = Join-Path $PSScriptRoot "..\PenguinLogisticsOnlineNetworkDistributionSystem\src\Plonds.Tool\Plonds.Tool.csproj"
+if (-not (Test-Path -LiteralPath $toolProject)) {
+    throw "PLONDS tool project not found: $toolProject"
 }
 
-$rsa = [System.Security.Cryptography.RSA]::Create()
-try {
-    $rsa.ImportFromPem($privateKeyPem)
-    $signatureBytes = $rsa.SignData(
-        $manifestBytes,
-        [System.Security.Cryptography.HashAlgorithmName]::SHA256,
-        [System.Security.Cryptography.RSASignaturePadding]::Pkcs1
-    )
+& dotnet run --project $toolProject -- sign --manifest $FilesJsonPath --private-key $PrivateKeyPath --output $OutputPath
+if ($LASTEXITCODE -ne 0) {
+    throw "PLONDS sign command failed."
 }
-finally {
-    $rsa.Dispose()
-}
-
-$signatureBase64 = [Convert]::ToBase64String($signatureBytes)
-[System.IO.File]::WriteAllText($OutputPath, $signatureBase64, [System.Text.Encoding]::ASCII)
-
-Write-Host "Signed manifest file."
-Write-Host "Manifest:  $FilesJsonPath"
-Write-Host "Signature: $OutputPath"