重构后端服务架构并优化前端错误处理

fastapi-backend/README.md

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+# FastAPI Backend for 活牛采购智能数字化系统
+
+This is a FastAPI implementation of the backend for the 活牛采购智能数字化系统.
+
+## Features
+- User authentication with JWT
+- Order management
+- Payment processing
+- Role-based access control
+- Database integration with SQLAlchemy
+- API documentation with Swagger UI and ReDoc
+
+## Requirements
+- Python 3.8+
+- FastAPI
+- SQLAlchemy
+- PyJWT
+- Uvicorn
+
+## Installation
+1. Create a virtual environment:
+   ```bash
+   python -m venv venv
+   source venv/bin/activate  # On Windows: venv\Scripts\activate
+   ```
+
+2. Install dependencies:
+   ```bash
+   pip install -r requirements.txt
+   ```
+
+3. Configure environment variables (see .env.example)
+
+4. Run the application:
+   ```bash
+   uvicorn app.main:app --reload
+   ```
+
+## API Documentation
+Once the server is running, you can access:
+- Swagger UI: http://localhost:8000/docs
+- ReDoc: http://localhost:8000/redoc