{
    "service": "NexTech UGC 文件上传服务",
    "version": "1.0",
    "endpoints": {
        "POST \/upload": "上传文件（multipart\/form-data, field: file, max 5MB）",
        "GET \/files\/{filename}": "下载文件"
    },
    "limits": {
        "max_file_size": "5MB",
        "retention": "当天有效，每日 24:00 清理"
    }
}