feat: add PaymentTransaction table for gateway-level tracking

- New PaymentTransaction entity (Domain/Entities/Payment/) with all gateway fields:
  GatewayProvider, MerchantId, Authority, CardPan, CardHash, RefId, VerificationStatusCode, etc.
- New PaymentTransactionConfiguration with indexes on Authority, GatewayProvider, UserId, TransactionId, RefId
- Added DbSet<PaymentTransaction> to IApplicationDbContext and ApplicationDbContext
- Extended PaymentVerificationResult DTO with CardPan, CardHash, VerificationCode
- Updated ZarinPalPaymentService.VerifyPayment to return CardPan/CardHash/VerificationCode
- Updated all 5 payment consumers to create/update PaymentTransaction:
  * PlaceOrderCommandHandler — creates PaymentTransaction after InitiatePayment
  * PaymentCallbackController — updates PaymentTransaction after VerifyPayment
  * ChargeDiscountWalletCommandHandler — creates PaymentTransaction + fixed callback URL
  * VerifyDiscountWalletChargeCommandHandler — updates PaymentTransaction after verify
  * TransactionsService.CustomerPaymentRequest/Verification — create/update PaymentTransaction
  * PackageService.CustomerPurchasePackage/Verify — create/update PaymentTransaction
- Transaction table untouched — PaymentTransaction is a separate table
- Pattern inspired by PYMS: create row before gateway → update after verify
- EF migration: AddPaymentTransactionTable

src/CMSMicroservice.WebApi/Controllers/PaymentCallbackController.cs

@@ -90,6 +90,20 @@ public class PaymentCallbackController : ControllerBase
                 paymentSuccess = verifyResult.IsSuccess;
                 refId = verifyResult.TrackingCode ?? verifyResult.RefId;
 
+                // آپدیت PaymentTransaction با نتیجه verify
+                var paymentTx = await _context.PaymentTransactions
+                    .FirstOrDefaultAsync(pt => pt.Authority == authority, cancellationToken);
+                if (paymentTx != null)
+                {
+                    paymentTx.PaymentStatus = verifyResult.IsSuccess;
+                    paymentTx.VerificationStatusCode = verifyResult.VerificationCode;
+                    paymentTx.VerificationStatusMessage = verifyResult.Message;
+                    paymentTx.CardPan = verifyResult.CardPan;
+                    paymentTx.CardHash = verifyResult.CardHash;
+                    paymentTx.RefId = verifyResult.TrackingCode;
+                    await _context.SaveChangesAsync(cancellationToken);
+                }
+
                 _logger.LogInformation(
                     "Payment verification for Order #{OrderId}: Success={Success}, RefId={RefId}, Message={Message}",
                     orderId, paymentSuccess, refId, verifyResult.Message);