feat(member): implement member center management module

src/Domain/TakeoutSaaS.Domain/Membership/Entities/MemberTier.cs

@@ -17,6 +17,41 @@ public sealed class MemberTier : MultiTenantEntityBase
     /// </summary>
     public int RequiredGrowth { get; set; }
 
+    /// <summary>
+    /// 图标键。
+    /// </summary>
+    public string IconKey { get; set; } = "user";
+
+    /// <summary>
+    /// 主题色。
+    /// </summary>
+    public string ColorHex { get; set; } = "#999999";
+
+    /// <summary>
+    /// 升级规则类型（none/amount/count/both）。
+    /// </summary>
+    public string UpgradeRuleType { get; set; } = "none";
+
+    /// <summary>
+    /// 升级累计消费门槛。
+    /// </summary>
+    public decimal? UpgradeAmountThreshold { get; set; }
+
+    /// <summary>
+    /// 升级消费次数门槛。
+    /// </summary>
+    public int? UpgradeOrderCountThreshold { get; set; }
+
+    /// <summary>
+    /// 降级观察窗口天数。
+    /// </summary>
+    public int DowngradeWindowDays { get; set; } = 90;
+
+    /// <summary>
+    /// 是否默认等级。
+    /// </summary>
+    public bool IsDefault { get; set; }
+
     /// <summary>
     /// 等级权益（JSON）。
     /// </summary>