ci: switch docs deploy to pnpm + mirror imx-forge's deploy workflow

- drop npm (package-lock.json); adopt pnpm + pnpm-lock.yaml + pnpm-workspace.yaml
  (consistent with imx-forge, the sibling studio project)
- deploy.yml mirrors imx-forge exactly: pnpm/action-setup@v4 (v10),
  Node 22, pnpm install --frozen-lockfile, peaceiris/actions-gh-pages@v4
  pushing site/.vitepress/dist to the gh-pages branch (was actions/deploy-pages)
- pnpm-workspace.yaml: allowBuilds esbuild: true (match imx; esbuild postinstall
  needs to run for VitePress/Vite)

Verified: pnpm install --frozen-lockfile + pnpm build both green locally.

Author: Charliechen114514

.github/workflows/deploy.yml

@@ -1,62 +1,42 @@
-name: Deploy Docs
+name: Deploy VitePress
 
 on:
   push:
-    branches: [main]
-    paths:
-      - 'document/**'
-      - 'site/**'
-      - 'project.config.ts'
-      - 'package.json'
-      - 'package-lock.json'
-      - '.github/workflows/deploy.yml'
+    branches:
+      - main
   workflow_dispatch:
 
 permissions:
-  contents: read
-  pages: write
-  id-token: write
-
-concurrency:
-  group: pages
-  cancel-in-progress: false
+  contents: write
 
 jobs:
-  build:
+  deploy:
     runs-on: ubuntu-latest
+
     steps:
-      - uses: actions/checkout@v4
+      - name: Checkout
+        uses: actions/checkout@v4
         with:
-          # VitePress lastUpdated 依赖完整 git 历史
           fetch-depth: 0
 
-      - name: Setup Node
+      - name: Setup Node.js
         uses: actions/setup-node@v4
         with:
-          node-version: 20
-          cache: npm
+          node-version: '22'
 
-      - name: Setup Pages
-        uses: actions/configure-pages@v5
+      - name: Setup pnpm
+        uses: pnpm/action-setup@v4
+        with:
+          version: 10
 
       - name: Install dependencies
-        run: npm ci
-
-      - name: Build VitePress site
-        run: npm run build
+        run: pnpm install --frozen-lockfile
 
-      - name: Upload artifact
-        uses: actions/upload-pages-artifact@v3
-        with:
-          path: site/.vitepress/dist
+      - name: Build
+        run: pnpm build
 
-  deploy:
-    needs: build
-    runs-on: ubuntu-latest
-    environment:
-      name: github-pages
-      url: ${{ steps.deployment.outputs.page_url }}
-    steps:
       - name: Deploy to GitHub Pages
-        id: deployment
-        uses: actions/deploy-pages@v4
+        uses: peaceiris/actions-gh-pages@v4
+        with:
+          github_token: ${{ secrets.GITHUB_TOKEN }}
+          publish_dir: ./site/.vitepress/dist