feat: Add ClearCart command and response, implement CancelOrder command with validation, and enhance DeliveryStatus and User models

src/CMSMicroservice.Application/UserOrderCQ/EventHandlers/CancelOrderEventHandlers/CancelOrderEventHandler.cs

@@ -0,0 +1,26 @@
+using Microsoft.Extensions.Logging;
+using CMSMicroservice.Domain.Events;
+
+namespace CMSMicroservice.Application.UserOrderCQ.EventHandlers.CancelOrderEventHandlers;
+
+public class CancelOrderEventHandler : INotificationHandler<CancelOrderEvent>
+{
+    private readonly ILogger<CancelOrderEventHandler> _logger;
+
+    public CancelOrderEventHandler(ILogger<CancelOrderEventHandler> logger)
+    {
+        _logger = logger;
+    }
+
+    public Task Handle(CancelOrderEvent notification, CancellationToken cancellationToken)
+    {
+        _logger.LogInformation("Order {OrderId} cancelled. Reason: {Reason}", 
+            notification.Order.Id,
+            notification.CancelReason);
+        
+        // اینجا می‌تونیم اعلان به کاربر بفرستیم
+        // یا موجودی محصولات رو بازگردانیم به انبار
+        
+        return Task.CompletedTask;
+    }
+}