feat: 扩展领域模型与配置

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

@@ -0,0 +1,29 @@
+using TakeoutSaaS.Shared.Abstractions.Entities;
+
+namespace TakeoutSaaS.Domain.Membership.Entities;
+
+/// <summary>
+/// 会员等级定义。
+/// </summary>
+public sealed class MemberTier : MultiTenantEntityBase
+{
+    /// <summary>
+    /// 等级名称。
+    /// </summary>
+    public string Name { get; set; } = string.Empty;
+
+    /// <summary>
+    /// 所需成长值。
+    /// </summary>
+    public int RequiredGrowth { get; set; }
+
+    /// <summary>
+    /// 等级权益（JSON）。
+    /// </summary>
+    public string BenefitsJson { get; set; } = string.Empty;
+
+    /// <summary>
+    /// 排序值。
+    /// </summary>
+    public int SortOrder { get; set; } = 100;
+}