ci: add Velopack packaging script and release job

- scripts/release/package-velopack.ps1: self-contained publish + vpk pack
- release job: runs package-velopack.ps1, uploads Setup.exe + Portable.zip
- Artifact names: RGBLedStripController-Setup-<tag>-win-x64, RGBLedStripController-Portable-<tag>-win-x64

.gitea/workflows/ci.yml

@@ -147,14 +147,26 @@ jobs:
       - name: Restore tools
         run: dotnet tool restore
 
-      - name: Publish (Release, self-contained, single file)
-        run: dotnet publish src/RgbLedStripController/RgbLedStripController.csproj -c Release -r win-x64 --self-contained true -p:PublishSingleFile=true --configfile NuGet.Config
+      - name: Package with Velopack (Setup.exe + Portable.zip)
+        shell: pwsh
+        run: |
+          $ErrorActionPreference = "Stop"
+          & powershell.exe -NoProfile -ExecutionPolicy Bypass -File scripts/release/package-velopack.ps1
 
-      - name: Upload release artifacts
+      - name: Upload Velopack artifacts (Setup.exe + Portable.zip)
         uses: actions/upload-artifact@v4
         with:
-          name: rgb-led-strip-controller-${{ gitea.ref_name || 'manual' }}-win-x64
+          name: RGBLedStripController-Setup-${{ gitea.ref_name || 'manual' }}-win-x64
+          path: |
+            artifacts/velopack/win-x64-stable/*.exe
+            artifacts/velopack/win-x64-stable/*.zip
+          if-no-files-found: error
+
+      - name: Upload portable exe (fallback)
+        uses: actions/upload-artifact@v4
+        with:
+          name: RGBLedStripController-Portable-${{ gitea.ref_name || 'manual' }}-win-x64
           path: |
             src/RgbLedStripController/bin/Release/net8.0-windows10.0.19041.0/win-x64/publish/RgbLedStripController.exe
             src/RgbLedStripController/bin/Release/net8.0-windows10.0.19041.0/win-x64/publish/RgbLedStripController.pdb
-          if-no-files-found: error
+          if-no-files-found: error