{"success":true,"message":"SandFlowing 游戏服务器","version":"1.0.0","endpoints":{"GET /health":"健康检查","GET /api/user/:playerId":"获取玩家信息","POST /api/user/:playerId/watch-ad":"看广告加钻石","PUT /api/user/:playerId/highest-score":"更新玩家最高分","PUT /api/user/:playerId/level":"更新玩家关卡等级","PUT /api/user/:playerId/diamonds":"增加/减少玩家钻石","GET /api/user/leaderboard":"获取排行榜（按最高分排序）","GET /api/user/:playerId/rank":"获取玩家排名","GET /api/log/:playerId":"获取玩家行为日志","GET /api/log/stats/overview":"获取行为统计"}}