feat: 扩展领域模型与配置

src/Domain/TakeoutSaaS.Domain/Ordering/Entities/CheckoutSession.cs

@@ -0,0 +1,40 @@
+using TakeoutSaaS.Domain.Ordering.Enums;
+using TakeoutSaaS.Shared.Abstractions.Entities;
+
+namespace TakeoutSaaS.Domain.Ordering.Entities;
+
+/// <summary>
+/// 结账会话，记录校验上下文。
+/// </summary>
+public sealed class CheckoutSession : MultiTenantEntityBase
+{
+    /// <summary>
+    /// 用户标识。
+    /// </summary>
+    public Guid UserId { get; set; }
+
+    /// <summary>
+    /// 门店标识。
+    /// </summary>
+    public Guid StoreId { get; set; }
+
+    /// <summary>
+    /// 会话 Token。
+    /// </summary>
+    public string SessionToken { get; set; } = string.Empty;
+
+    /// <summary>
+    /// 会话状态。
+    /// </summary>
+    public CheckoutSessionStatus Status { get; set; } = CheckoutSessionStatus.Pending;
+
+    /// <summary>
+    /// 校验结果明细 JSON。
+    /// </summary>
+    public string ValidationResultJson { get; set; } = string.Empty;
+
+    /// <summary>
+    /// 过期时间（UTC）。
+    /// </summary>
+    public DateTime ExpiresAt { get; set; }
+}