ci(wbs-ux): inject Vue 3 frontend build task to release compilation pipeline

.gitea/workflows/prepare-release.yml

@@ -76,10 +76,29 @@ jobs:
           echo "Version: $VERSION"
           echo "Commit: $COMMIT"
 
+      - name: Setup Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: '20'
+
+      - name: Install Frontend Dependencies & Build
+        run: |
+          cd src/frontend
+          npm install
+          npm run build
+          cd ../..
+
+      - name: Copy Built Frontend to wwwroot
+        run: |
+          mkdir -p src/dotnet/QuantEngine.Web/wwwroot
+          cp -r src/frontend/dist/* src/dotnet/QuantEngine.Web/wwwroot/
+          echo "✓ Frontend assets copied to BFF wwwroot"
+
       - name: Restore
         run: |
           dotnet restore src/dotnet/QuantEngine.Web/QuantEngine.Web.csproj
 
+
       - name: Build (Release)
         run: |
           dotnet build src/dotnet/QuantEngine.Web/QuantEngine.Web.csproj \