Get continuous sign-in ranking | 获取连续签到排行榜

{
    "code": 20000,
    "data": {
        "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
    },
    "err_code": "string",
    "msg": null
}