schema.SigninRankingResponse

{
    "list": [
        {
            "avatar": "https://example.com/avatar.jpg",
            "continuous_days": 30,
            "rank": 1,
            "reward_points": 50,
            "total_days": 100,
            "user_id": 1001,
            "username": "张三"
        }
    ],
    "my_rank": 5
}