build: add explicit webview build step to workflow

(cherry picked from commit d8addeb)

Author: JerryliDe

.github/workflows/release.yml

@@ -52,6 +52,10 @@ jobs:
       - name: 📦 Install dependencies
         run: npm install
 
+      # 3.1 构建 Webview (VSCode 插件 UI)
+      - name: 🌐 Build Webview
+        run: npm run build:webview --workspace=packages/vscode-ui-plugin
+
       # 4. 获取并同步版本号
       - name: 📌 Get and Sync version
         id: get_version