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/PackageCQ/Commands/PurchasePackage/PurchasePackageCommand.cs

@@ -0,0 +1,18 @@
+using CMSMicroservice.Application.Common.Interfaces;
+using CMSMicroservice.Application.Common.Models;
+using CMSMicroservice.Domain.Enums;
+using MediatR;
+using Microsoft.EntityFrameworkCore;
+
+namespace CMSMicroservice.Application.PackageCQ.Commands.PurchasePackage;
+
+/// <summary>
+/// دستور خرید پکیج از طریق درگاه بانکی
+/// </summary>
+public class PurchasePackageCommand : IRequest<PaymentInitiateResult>
+{
+    /// <summary>
+    /// شناسه کاربر
+    /// </summary>
+    public long UserId { get; set; }
+}