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/guide/first-workflow.md

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+# First Workflow: Build a Simple API
+
+Complete your first CCW workflow in 30 minutes. We'll build a simple REST API from specification to implementation.
+
+## What We'll Build
+
+A simple users API with:
+- GET /users - List all users
+- GET /users/:id - Get user by ID
+- POST /users - Create new user
+- PUT /users/:id - Update user
+- DELETE /users/:id - Delete user
+
+## Prerequisites
+
+- CCW installed ([Installation Guide](./installation.md))
+- Node.js >= 18.0.0
+- Code editor (VS Code recommended)
+
+## Step 1: Create Project (5 minutes)
+
+```bash
+# Create project directory
+mkdir user-api
+cd user-api
+
+# Initialize npm project
+npm init -y
+
+# Install dependencies
+npm install express
+npm install --save-dev typescript @types/node @types/express
+```
+
+## Step 2: Generate Specification (5 minutes)
+
+```bash
+# Use CCW to generate API specification
+ccw cli -p "Generate a REST API specification for a users resource with CRUD operations" --mode analysis
+```
+
+CCW will analyze your request and generate a specification document.
+
+## Step 3: Implement API (15 minutes)
+
+```bash
+# Implement the API
+ccw cli -p "Implement the users API following the specification with Express and TypeScript" --mode write
+```
+
+CCW will:
+1. Create the project structure
+2. Implement the routes
+3. Add type definitions
+4. Include error handling
+
+## Step 4: Review Code (5 minutes)
+
+```bash
+# Review the implementation
+ccw cli -p "Review the users API code for quality, security, and best practices" --mode analysis
+```
+
+## Step 5: Test and Run
+
+```bash
+# Compile TypeScript
+npx tsc
+
+# Run the server
+node dist/index.js
+
+# Test the API
+curl http://localhost:3000/users
+```
+
+## Expected Result
+
+You should have:
+- `src/index.ts` - Main server file
+- `src/routes/users.ts` - User routes
+- `src/types/user.ts` - User types
+- `src/middleware/error.ts` - Error handling
+
+## Next Steps
+
+- [CLI Reference](../cli/commands.md) - Learn all CLI commands
+- [Skills Library](../skills/core-skills.md) - Explore built-in skills
+- [Workflow System](../workflows/4-level.md) - Understand workflow orchestration
+
+::: tip Congratulations! 🎉
+You've completed your first CCW workflow. You can now use CCW for more complex projects.
+:::