Add validators and services for Product Galleries and Product Tags

- Implemented Create, Delete, Get, and Update validators for Product Galleries.
- Added Create, Delete, Get, and Update validators for Product Tags.
- Created service classes for handling Discount Categories, Discount Orders, Discount Products, Discount Shopping Cart, Product Categories, Product Galleries, and Product Tags.
- Each service class integrates with CQRS for command and query handling.
- Established mapping profiles for Product Galleries.

src/CMSMicroservice.Infrastructure/Persistence/Migrations/20251201172747_AddEmailToUser.Designer.cs

@@ -1042,7 +1042,7 @@ namespace CMSMicroservice.Infrastructure.Persistence.Migrations
                     b.ToTable("Packages", "CMS");
                 });
 
-            modelBuilder.Entity("CMSMicroservice.Domain.Entities.ProductGallerys", b =>
+            modelBuilder.Entity("CMSMicroservice.Domain.Entities.ProductGalleries", b =>
                 {
                     b.Property<long>("Id")
                         .ValueGeneratedOnAdd()
@@ -1965,7 +1965,7 @@ namespace CMSMicroservice.Infrastructure.Persistence.Migrations
                     b.Navigation("User");
                 });
 
-            modelBuilder.Entity("CMSMicroservice.Domain.Entities.ProductGallerys", b =>
+            modelBuilder.Entity("CMSMicroservice.Domain.Entities.ProductGalleries", b =>
                 {
                     b.HasOne("CMSMicroservice.Domain.Entities.Products", "Product")
                         .WithMany("ProductGalleryss")