{"message":"API Flash Image Upload Service","endpoints":{"upload":"POST /upload - 上传图片到 R2 存储","generate":"POST /generate - 基于提示词生成图片（可选上传参考图片）","test-download":"POST /test-download - 测试下载指定URL图片到R2","logs":"GET /logs - 查询生成记录","stats":"GET /stats - 查询API统计"}}