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.Infrastructure/Persistence/Configurations/PaymentTransactionConfiguration.cs

@@ -0,0 +1,51 @@
+using CMSMicroservice.Domain.Entities.Payment;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.EntityFrameworkCore.Metadata.Builders;
+
+namespace CMSMicroservice.Infrastructure.Persistence.Configurations;
+
+public class PaymentTransactionConfiguration : IEntityTypeConfiguration<PaymentTransaction>
+{
+    public void Configure(EntityTypeBuilder<PaymentTransaction> builder)
+    {
+        builder.HasQueryFilter(p => !p.IsDeleted);
+        builder.Ignore(entity => entity.DomainEvents);
+        builder.HasKey(entity => entity.Id);
+        builder.Property(entity => entity.Id).UseIdentityColumn();
+
+        // اطلاعات درخواست
+        builder.Property(e => e.GatewayProvider).IsRequired().HasMaxLength(50);
+        builder.Property(e => e.MerchantId).IsRequired().HasMaxLength(200);
+        builder.Property(e => e.Amount).IsRequired();
+        builder.Property(e => e.CallbackUrl).IsRequired().HasMaxLength(500);
+        builder.Property(e => e.Description).IsRequired().HasMaxLength(500);
+        builder.Property(e => e.Mobile).HasMaxLength(20);
+        builder.Property(e => e.UserId);
+
+        // پاسخ درخواست
+        builder.Property(e => e.RequestStatusCode);
+        builder.Property(e => e.RequestStatusMessage).HasMaxLength(500);
+        builder.Property(e => e.Authority).HasMaxLength(200);
+
+        // وضعیت پرداخت
+        builder.Property(e => e.PaymentStatus).IsRequired();
+
+        // نتیجه verify
+        builder.Property(e => e.VerificationStatusCode);
+        builder.Property(e => e.VerificationStatusMessage).HasMaxLength(500);
+        builder.Property(e => e.CardHash).HasMaxLength(200);
+        builder.Property(e => e.CardPan).HasMaxLength(30);
+        builder.Property(e => e.RefId).HasMaxLength(200);
+
+        // ارتباط داخلی
+        builder.Property(e => e.TransactionId);
+        builder.Property(e => e.OrderId).HasMaxLength(100);
+
+        // ایندکس‌ها
+        builder.HasIndex(e => e.Authority);
+        builder.HasIndex(e => e.GatewayProvider);
+        builder.HasIndex(e => e.UserId);
+        builder.HasIndex(e => e.TransactionId);
+        builder.HasIndex(e => e.RefId);
+    }
+}