docs: add VitePress documentation site

- Add docs directory with VitePress configuration
- Add GitHub Actions workflow for docs build and deploy
- Support bilingual (English/Chinese) documentation
- Include search, custom theme, and responsive design

docs/index.md

@@ -0,0 +1,11 @@
+---
+layout: page
+title: CCW Documentation
+titleTemplate: Claude Code Workspace
+---
+
+<script setup>
+import ProfessionalHome from './.vitepress/theme/components/ProfessionalHome.vue'
+</script>
+
+<ProfessionalHome lang="en" />