Revert "refactor: 清理租户API旧模块代码"

This reverts commit 992930a821.

src/Application/TakeoutSaaS.Application/Messaging/Events/OrderCreatedEvent.cs

@@ -0,0 +1,32 @@
+namespace TakeoutSaaS.Application.Messaging.Events;
+
+/// <summary>
+/// 订单创建事件。
+/// </summary>
+public sealed class OrderCreatedEvent
+{
+    /// <summary>
+    /// 订单标识。
+    /// </summary>
+    public long OrderId { get; init; }
+
+    /// <summary>
+    /// 订单编号。
+    /// </summary>
+    public string OrderNo { get; init; } = string.Empty;
+
+    /// <summary>
+    /// 实付金额。
+    /// </summary>
+    public decimal Amount { get; init; }
+
+    /// <summary>
+    /// 所属租户。
+    /// </summary>
+    public long TenantId { get; init; }
+
+    /// <summary>
+    /// 创建时间（UTC）。
+    /// </summary>
+    public DateTime CreatedAt { get; init; }
+}