{"message":"食物营养数据 API","version":"1.0.0","endpoints":{"categories":"/categories - 获取所有食物分类","foods":"/foods - 获取所有食物（支持分页和筛选）","food":"/foods/:id - 获取单个食物详情（含营养素）"},"documentation":"https://github.com/your-repo/API.md","stats":{"categories":19,"foods":340,"nutrients_types":228,"data_source":"USDA FoodData Central (2025-04-24)"}}