Add migration for DiscountProductImages table

- Created a new table `DiscountProductImages` in the CMS schema.
- Added columns for image details including `Title`, `AltText`, `ImagePath`, `ThumbnailPath`, `SortOrder`, `IsActive`, `Created`, `CreatedBy`, `LastModified`, `LastModifiedBy`, and `IsDeleted`.
- Established a foreign key relationship with the `DiscountProducts` table.
- Created indexes on `DiscountProductId` and a composite index on `DiscountProductId` and `SortOrder`.

src/CMSMicroservice.Application/DiscountShopCQ/Commands/PlaceOrder/PlaceOrderCommandHandler.cs

@@ -1,4 +1,5 @@
 using CMSMicroservice.Application.Common.Interfaces;
+using CMSMicroservice.Application.Common.Services;
 using CMSMicroservice.Domain.Entities.DiscountShop;
 using CMSMicroservice.Domain.Entities.Payment;
 using CMSMicroservice.Domain.Enums;
@@ -109,9 +110,10 @@ public class PlaceOrderCommandHandler : IRequestHandler<PlaceOrderCommand, Place
 
         var gatewayAmountRequired = totalAmount - actualDiscountBalanceUsed;
 
-        // Calculate VAT (9%)
-        var vatAmount = (gatewayAmountRequired * 9) / 100;
-        var finalGatewayAmount = gatewayAmountRequired + vatAmount;
+        // Calculate VAT using centralized calculator
+        var vatBreakdown = VatCalculator.CalculateBreakdown(gatewayAmountRequired);
+        var vatAmount = vatBreakdown.VatAmount;
+        var finalGatewayAmount = vatBreakdown.GrossAmount;
 
         // Create transaction for gateway payment
         var transaction = new Transaction