Ensure uninherited types are sealed

Resolved mediator source geenrator conflict with tests

LiteCharms.Features.MidrandBooks/Postgres/Migrations/20260529070104_Init.cs

@@ -7,7 +7,7 @@ using Npgsql.EntityFrameworkCore.PostgreSQL.Metadata;
 namespace LiteCharms.Features.MidrandBooks.Postgres.Migrations
 {
     /// <inheritdoc />
-    public partial class Init : Migration
+    public sealed partial class Init : Migration
     {
         /// <inheritdoc />
         protected override void Up(MigrationBuilder migrationBuilder)

LiteCharms.Features.MidrandBooks/Postgres/Migrations/20260530104851_AddedCategories.cs

@@ -6,7 +6,7 @@ using Npgsql.EntityFrameworkCore.PostgreSQL.Metadata;
 namespace LiteCharms.Features.MidrandBooks.Postgres.Migrations
 {
     /// <inheritdoc />
-    public partial class AddedCategories : Migration
+    public sealed partial class AddedCategories : Migration
     {
         /// <inheritdoc />
         protected override void Up(MigrationBuilder migrationBuilder)

LiteCharms.Features.MidrandBooks/Postgres/Migrations/20260530125323_AddedProductCategories.cs

@@ -6,7 +6,7 @@ using Npgsql.EntityFrameworkCore.PostgreSQL.Metadata;
 namespace LiteCharms.Features.MidrandBooks.Postgres.Migrations
 {
     /// <inheritdoc />
-    public partial class AddedProductCategories : Migration
+    public sealed partial class AddedProductCategories : Migration
     {
         /// <inheritdoc />
         protected override void Up(MigrationBuilder migrationBuilder)

LiteCharms.Features.MidrandBooks/Postgres/Migrations/20260531094401_AddedPaymentObjects.cs

@@ -7,7 +7,7 @@ using Npgsql.EntityFrameworkCore.PostgreSQL.Metadata;
 namespace LiteCharms.Features.MidrandBooks.Postgres.Migrations
 {
     /// <inheritdoc />
-    public partial class AddedPaymentObjects : Migration
+    public sealed partial class AddedPaymentObjects : Migration
     {
         /// <inheritdoc />
         protected override void Up(MigrationBuilder migrationBuilder)

LiteCharms.Features.MidrandBooks/Postgres/Migrations/20260601071804_RemovedPassphraseFromPaymentGateway.cs

@@ -5,7 +5,7 @@
 namespace LiteCharms.Features.MidrandBooks.Postgres.Migrations
 {
     /// <inheritdoc />
-    public partial class RemovedPassphraseFromPaymentGateway : Migration
+    public sealed partial class RemovedPassphraseFromPaymentGateway : Migration
     {
         /// <inheritdoc />
         protected override void Up(MigrationBuilder migrationBuilder)

LiteCharms.Features.MidrandBooks/Postgres/Migrations/20260602202421_AddedPaymentGatewayLedger.cs

@@ -7,7 +7,7 @@ using Npgsql.EntityFrameworkCore.PostgreSQL.Metadata;
 namespace LiteCharms.Features.MidrandBooks.Postgres.Migrations
 {
     /// <inheritdoc />
-    public partial class AddedPaymentGatewayLedger : Migration
+    public sealed partial class AddedPaymentGatewayLedger : Migration
     {
         /// <inheritdoc />
         protected override void Up(MigrationBuilder migrationBuilder)

LiteCharms.Features.MidrandBooks/Postgres/Migrations/20260602205838_AddedPayfastPaymentIdToPaymentGatewayLedger.cs

@@ -5,7 +5,7 @@
 namespace LiteCharms.Features.MidrandBooks.Postgres.Migrations
 {
     /// <inheritdoc />
-    public partial class AddedPayfastPaymentIdToPaymentGatewayLedger : Migration
+    public sealed partial class AddedPayfastPaymentIdToPaymentGatewayLedger : Migration
     {
         /// <inheritdoc />
         protected override void Up(MigrationBuilder migrationBuilder)

LiteCharms.Features.MidrandBooks/Postgres/Migrations/20260612210020_OnlyEmailIsMandatoryOnCustomer.cs

@@ -5,7 +5,7 @@
 namespace LiteCharms.Features.MidrandBooks.Postgres.Migrations
 {
     /// <inheritdoc />
-    public partial class OnlyEmailIsMandatoryOnCustomer : Migration
+    public sealed partial class OnlyEmailIsMandatoryOnCustomer : Migration
     {
         /// <inheritdoc />
         protected override void Up(MigrationBuilder migrationBuilder)