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.Application/UserCartsCQ/Commands/ClearCart/ClearCartCommandHandler.cs

@@ -14,7 +14,7 @@ public class ClearCartCommandHandler : IRequestHandler<ClearCartCommand, ClearCa
     public async Task<ClearCartResponseDto> Handle(ClearCartCommand request, CancellationToken cancellationToken)
     {
         // پیدا کردن تمام آیتم‌های سبد خرید کاربر
-        var cartItems = await _context.UserCartss
+        var cartItems = await _context.UserCarts
             .Where(c => c.UserId == request.UserId)
             .ToListAsync(cancellationToken);
         
@@ -31,7 +31,7 @@ public class ClearCartCommandHandler : IRequestHandler<ClearCartCommand, ClearCa
         var itemsCount = cartItems.Count;
         
         // حذف تمام آیتم‌ها
-        _context.UserCartss.RemoveRange(cartItems);
+        _context.UserCarts.RemoveRange(cartItems);
         
         // ثبت Event
         // می‌تونیم یک Event برای هر آیتم یا یک Event کلی بفرستیم