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/Migrations/20260215201802_AddPaymentTransactionTable.cs

@@ -0,0 +1,89 @@
+using System;
+using Microsoft.EntityFrameworkCore.Migrations;
+
+#nullable disable
+
+namespace CMSMicroservice.Infrastructure.Persistence.Migrations
+{
+    /// <inheritdoc />
+    public partial class AddPaymentTransactionTable : Migration
+    {
+        /// <inheritdoc />
+        protected override void Up(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.CreateTable(
+                name: "PaymentTransactions",
+                schema: "CMS",
+                columns: table => new
+                {
+                    Id = table.Column<long>(type: "bigint", nullable: false)
+                        .Annotation("SqlServer:Identity", "1, 1"),
+                    GatewayProvider = table.Column<string>(type: "nvarchar(50)", maxLength: 50, nullable: false),
+                    MerchantId = table.Column<string>(type: "nvarchar(200)", maxLength: 200, nullable: false),
+                    Amount = table.Column<long>(type: "bigint", nullable: false),
+                    CallbackUrl = table.Column<string>(type: "nvarchar(500)", maxLength: 500, nullable: false),
+                    Description = table.Column<string>(type: "nvarchar(500)", maxLength: 500, nullable: false),
+                    Mobile = table.Column<string>(type: "nvarchar(20)", maxLength: 20, nullable: true),
+                    UserId = table.Column<long>(type: "bigint", nullable: true),
+                    RequestStatusCode = table.Column<int>(type: "int", nullable: true),
+                    RequestStatusMessage = table.Column<string>(type: "nvarchar(500)", maxLength: 500, nullable: true),
+                    Authority = table.Column<string>(type: "nvarchar(200)", maxLength: 200, nullable: true),
+                    PaymentStatus = table.Column<bool>(type: "bit", nullable: false),
+                    VerificationStatusCode = table.Column<int>(type: "int", nullable: true),
+                    VerificationStatusMessage = table.Column<string>(type: "nvarchar(500)", maxLength: 500, nullable: true),
+                    CardHash = table.Column<string>(type: "nvarchar(200)", maxLength: 200, nullable: true),
+                    CardPan = table.Column<string>(type: "nvarchar(30)", maxLength: 30, nullable: true),
+                    RefId = table.Column<string>(type: "nvarchar(200)", maxLength: 200, nullable: true),
+                    TransactionId = table.Column<long>(type: "bigint", nullable: true),
+                    OrderId = table.Column<string>(type: "nvarchar(100)", maxLength: 100, nullable: true),
+                    Created = table.Column<DateTime>(type: "datetime2", nullable: false),
+                    CreatedBy = table.Column<string>(type: "nvarchar(max)", nullable: true),
+                    LastModified = table.Column<DateTime>(type: "datetime2", nullable: true),
+                    LastModifiedBy = table.Column<string>(type: "nvarchar(max)", nullable: true),
+                    IsDeleted = table.Column<bool>(type: "bit", nullable: false)
+                },
+                constraints: table =>
+                {
+                    table.PrimaryKey("PK_PaymentTransactions", x => x.Id);
+                });
+
+            migrationBuilder.CreateIndex(
+                name: "IX_PaymentTransactions_Authority",
+                schema: "CMS",
+                table: "PaymentTransactions",
+                column: "Authority");
+
+            migrationBuilder.CreateIndex(
+                name: "IX_PaymentTransactions_GatewayProvider",
+                schema: "CMS",
+                table: "PaymentTransactions",
+                column: "GatewayProvider");
+
+            migrationBuilder.CreateIndex(
+                name: "IX_PaymentTransactions_RefId",
+                schema: "CMS",
+                table: "PaymentTransactions",
+                column: "RefId");
+
+            migrationBuilder.CreateIndex(
+                name: "IX_PaymentTransactions_TransactionId",
+                schema: "CMS",
+                table: "PaymentTransactions",
+                column: "TransactionId");
+
+            migrationBuilder.CreateIndex(
+                name: "IX_PaymentTransactions_UserId",
+                schema: "CMS",
+                table: "PaymentTransactions",
+                column: "UserId");
+        }
+
+        /// <inheritdoc />
+        protected override void Down(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.DropTable(
+                name: "PaymentTransactions",
+                schema: "CMS");
+        }
+    }
+}

src/CMSMicroservice.Infrastructure/Persistence/Migrations/ApplicationDbContextModelSnapshot.cs

@@ -2328,6 +2328,114 @@ namespace CMSMicroservice.Infrastructure.Persistence.Migrations
                     b.ToTable("ManualPayments", "CMS");
                 });
 
+            modelBuilder.Entity("CMSMicroservice.Domain.Entities.Payment.PaymentTransaction", b =>
+                {
+                    b.Property<long>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("bigint");
+
+                    SqlServerPropertyBuilderExtensions.UseIdentityColumn(b.Property<long>("Id"));
+
+                    b.Property<long>("Amount")
+                        .HasColumnType("bigint");
+
+                    b.Property<string>("Authority")
+                        .HasMaxLength(200)
+                        .HasColumnType("nvarchar(200)");
+
+                    b.Property<string>("CallbackUrl")
+                        .IsRequired()
+                        .HasMaxLength(500)
+                        .HasColumnType("nvarchar(500)");
+
+                    b.Property<string>("CardHash")
+                        .HasMaxLength(200)
+                        .HasColumnType("nvarchar(200)");
+
+                    b.Property<string>("CardPan")
+                        .HasMaxLength(30)
+                        .HasColumnType("nvarchar(30)");
+
+                    b.Property<DateTime>("Created")
+                        .HasColumnType("datetime2");
+
+                    b.Property<string>("CreatedBy")
+                        .HasColumnType("nvarchar(max)");
+
+                    b.Property<string>("Description")
+                        .IsRequired()
+                        .HasMaxLength(500)
+                        .HasColumnType("nvarchar(500)");
+
+                    b.Property<string>("GatewayProvider")
+                        .IsRequired()
+                        .HasMaxLength(50)
+                        .HasColumnType("nvarchar(50)");
+
+                    b.Property<bool>("IsDeleted")
+                        .HasColumnType("bit");
+
+                    b.Property<DateTime?>("LastModified")
+                        .HasColumnType("datetime2");
+
+                    b.Property<string>("LastModifiedBy")
+                        .HasColumnType("nvarchar(max)");
+
+                    b.Property<string>("MerchantId")
+                        .IsRequired()
+                        .HasMaxLength(200)
+                        .HasColumnType("nvarchar(200)");
+
+                    b.Property<string>("Mobile")
+                        .HasMaxLength(20)
+                        .HasColumnType("nvarchar(20)");
+
+                    b.Property<string>("OrderId")
+                        .HasMaxLength(100)
+                        .HasColumnType("nvarchar(100)");
+
+                    b.Property<bool>("PaymentStatus")
+                        .HasColumnType("bit");
+
+                    b.Property<string>("RefId")
+                        .HasMaxLength(200)
+                        .HasColumnType("nvarchar(200)");
+
+                    b.Property<int?>("RequestStatusCode")
+                        .HasColumnType("int");
+
+                    b.Property<string>("RequestStatusMessage")
+                        .HasMaxLength(500)
+                        .HasColumnType("nvarchar(500)");
+
+                    b.Property<long?>("TransactionId")
+                        .HasColumnType("bigint");
+
+                    b.Property<long?>("UserId")
+                        .HasColumnType("bigint");
+
+                    b.Property<int?>("VerificationStatusCode")
+                        .HasColumnType("int");
+
+                    b.Property<string>("VerificationStatusMessage")
+                        .HasMaxLength(500)
+                        .HasColumnType("nvarchar(500)");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("Authority");
+
+                    b.HasIndex("GatewayProvider");
+
+                    b.HasIndex("RefId");
+
+                    b.HasIndex("TransactionId");
+
+                    b.HasIndex("UserId");
+
+                    b.ToTable("PaymentTransactions", "CMS");
+                });
+
             modelBuilder.Entity("CMSMicroservice.Domain.Entities.Product", b =>
                 {
                     b.Property<long>("Id")