Add GitHub Actions workflow for VitePress deployment

.github/workflows/deploy.yml

@@ -0,0 +1,46 @@
+name: Build & Deploy VitePress
+on:
+  push:
+    branches: [main]
+
+permissions:
+  contents: read
+  pages: write
+  id-token: write
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: actions/setup-node@v4
+        with:
+          node-version: 20
+
+      - run: echo '{"type":"module","devDependencies":{"vitepress":"^1.0.0"}}' > package.json
+      - run: npm i
+
+      - run: touch .nojekyll
+
+      - run: node .github/scripts/prepare.mjs   # 生成 sidebar.mjs
+
+      # 关键替换：直接复制模板，避开 heredoc
+      - run: |
+          mkdir -p .vitepress
+          cp .github/config.template.ts .vitepress/config.ts
+      - run: npx vitepress build .
+
+      - uses: actions/upload-pages-artifact@v3
+        with:
+          path: .vitepress/dist
+
+  deploy:
+    needs: build
+    runs-on: ubuntu-latest
+    environment:
+      name: github-pages
+      url: ${{ steps.d.outputs.page_url }}
+    steps:
+      - uses: actions/deploy-pages@v4
+        id: d