fix: proper DeliveryStatus mapping + cancel delivery on failed payment

- Added MapDeliveryStatus() to correctly map Domain→Proto enum values
- Domain Pending(1) was incorrectly cast to Proto PROCESSING(1) instead of PROCESSING
- Set DeliveryStatus=Cancelled when payment fails (CompleteOrderPaymentCommandHandler)
- Set DeliveryStatus=Cancelled when order expires (ExpirePendingOrdersService)

src/CMSMicroservice.Application/DiscountShopCQ/Commands/CompleteOrderPayment/CompleteOrderPaymentCommandHandler.cs

@@ -105,6 +105,7 @@ public class CompleteOrderPaymentCommandHandler : IRequestHandler<CompleteOrderP
 
             transaction.PaymentStatus = PaymentStatus.Reject;
             order.PaymentStatus = PaymentStatus.Reject;
+            order.DeliveryStatus = DeliveryStatus.Cancelled;
 
             await _context.SaveChangesAsync(cancellationToken);