签到与活动配置：后台配置接口、用户签到流程、UserEntity 扩展

UserSrc/UserService/User/Param/SignResult.cs

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+using CommonDomain.BaseModel;
+
+namespace UserService.Param
+{
+    /// <summary>签到奖励返回</summary>
+    public class SignRewardResult
+    {
+        /// <summary>本次签到对应第几天(1~7)</summary>
+        public int Day { get; set; } = 0;
+
+        public long Gold { get; set; } = 0;
+
+        public int Diamond { get; set; } = 0;
+
+        public List<BaseProductCount> Product { get; set; } = new List<BaseProductCount>();
+    }
+
+    /// <summary>签到状态返回</summary>
+    public class SignStatusResult
+    {
+        public bool IsOpen { get; set; } = false;
+
+        /// <summary>勾选=不可中断(漏签不回退)；未勾选=可中断(漏签重置)</summary>
+        public bool CannotInterrupt { get; set; } = false;
+
+        /// <summary>当前周期已完成到第几天(0~7)</summary>
+        public int SignDay { get; set; } = 0;
+
+        /// <summary>今天签到对应的天数(已签则为其已签天数；未签则为下一次目标天数)</summary>
+        public int TodayDay { get; set; } = 0;
+
+        /// <summary>今天是否已签到</summary>
+        public bool IsTodaySigned { get; set; } = false;
+
+        /// <summary>7 天奖励配置</summary>
+        public List<SignConfig> Days { get; set; } = new List<SignConfig>();
+    }
+}