feat: add one-click startup scripts for project management

- Add start.sh/start.bat for one-click startup (backend + frontend)
- Add stop.sh/stop.bat for stopping all services
- Add restart.sh for restarting services
- Add status.sh for checking service status
- Add Makefile with convenient management commands
- Add comprehensive documentation (ONE_CLICK_START.md)
- Update README with one-click startup instructions

Features:
- Automatic environment checking (venv, node_modules)
- Process management with PID tracking
- Unified log management (logs/*.log)
- Health checking after startup
- Support for Linux, macOS, and Windows
- No more need for multiple terminal windows

Usage:
  ./start.sh      # Start all services
  ./stop.sh       # Stop all services
  ./status.sh     # Check service status
  ./restart.sh    # Restart services
  make start      # Alternative using Makefile

Benefits:
- One command instead of multiple terminals
- Automatic environment validation
- Centralized logging
- Process lifecycle management
- Developer-friendly output messages

README.md

@@ -13,22 +13,44 @@
 
 **首次使用请阅读**: [快速上手指南](docs/QUICK_START.md)
 
-### 最快 3 步开始
+### 一键启动（推荐）
 
 ```bash
-# 1. 配置后端
-cd backend && pip install -r requirements.txt
-cp .env.example .env  # 编辑填入数据库和 API 配置
+# 1. 首次配置
+cd backend && python3 -m venv venv && source venv/bin/activate && pip install -r requirements.txt
+cd ../frontend && npm install
+# 配置环境变量
+cd ../backend && cp .env.example .env  # 编辑填入数据库和 API 配置
 
-# 2. 启动后端
-python -m app.main
-
-# 3. 启动前端
-cd ../frontend && npm install && npm run dev
+# 2. 启动项目（一个命令启动前后端）
+cd ..
+./start.sh        # Linux/Mac
+# 或
+start.bat         # Windows
 ```
 
 访问 http://localhost:5173 开始使用！
 
+**管理命令**:
+- 查看状态: `./status.sh`
+- 停止服务: `./stop.sh`
+- 重启服务: `./restart.sh`
+- 查看日志: `tail -f logs/backend.log`
+
+**详细说明**: [一键启动指南](docs/ONE_CLICK_START.md)
+
+### 手动启动（开发模式）
+
+如果你需要分别启动前后端：
+
+```bash
+# 终端 1: 启动后端
+cd backend && source venv/bin/activate && python -m app.main
+
+# 终端 2: 启动前端
+cd frontend && npm run dev
+```
+
 ### 1. 环境要求
 
 - Python 3.10+