docs: 添加项目启动说明
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STARTUP.md
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STARTUP.md
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# 成本预测系统 - 启动说明
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## 环境要求
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- Python 3.9 ~ 3.11
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## 启动步骤
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```bash
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# 1. 安装依赖
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pip install -e .
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# 2. 初始化派生特征数据(首次必须执行)
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python -m scripts.calculate_features
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# 3. 启动服务
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python run.py
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```
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浏览器打开 **http://127.0.0.1:5001** 即可。
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## 附注
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- 数据库为 SQLite,首次启动自动创建,无需安装配置
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- 如修改前端代码,需安装 Node.js 后在 `frontend/` 目录执行 `npm install && npm run build`
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