docs: add VitePress documentation site (#112)

- Add VitePress with full navigation, sidebar, i18n (en/zh), local search
- Create 50+ doc pages: guide, adapters (browser + desktop), developer, advanced
- Migrate content from README.md, CONTRIBUTING.md, TESTING.md, CDP.md, CLI-ELECTRON.md
- Migrate all 11 adapter READMEs to structured documentation
- Add new pages: architecture, yaml-adapter guide, ts-adapter guide, ai-workflow
- Add GitHub Actions workflow for deploying to GitHub Pages
- Add Chinese locale pages (getting-started, installation, browser-bridge, etc.)
- Add docs:dev, docs:build, docs:preview npm scripts

.github/workflows/docs.yml

@@ -0,0 +1,52 @@
+name: Deploy Docs
+
+on:
+  push:
+    branches: [main]
+    paths: ['docs/**']
+  workflow_dispatch:
+
+permissions:
+  contents: read
+  pages: write
+  id-token: write
+
+concurrency:
+  group: pages
+  cancel-in-progress: false
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      - uses: actions/setup-node@v4
+        with:
+          node-version: 20
+          cache: npm
+
+      - name: Install dependencies
+        run: npm ci
+
+      - name: Build docs
+        run: npm run docs:build
+
+      - uses: actions/configure-pages@v4
+
+      - uses: actions/upload-pages-artifact@v3
+        with:
+          path: docs/.vitepress/dist
+
+  deploy:
+    environment:
+      name: github-pages
+      url: ${{ steps.deployment.outputs.page_url }}
+    needs: build
+    runs-on: ubuntu-latest
+    steps:
+      - name: Deploy to GitHub Pages
+        id: deployment
+        uses: actions/deploy-pages@v4