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/DiscountShopCQ/Queries/GetOrderById/GetOrderByIdQuery.cs

@@ -0,0 +1,46 @@
+using CMSMicroservice.Domain.Enums;
+using MediatR;
+
+namespace CMSMicroservice.Application.DiscountShopCQ.Queries.GetOrderById;
+
+public class GetOrderByIdQuery : IRequest<OrderDetailDto?>
+{
+    public long OrderId { get; set; }
+    public long UserId { get; set; }
+}
+
+public class OrderDetailDto
+{
+    public long Id { get; set; }
+    public long UserId { get; set; }
+    public long TotalAmount { get; set; }
+    public long DiscountBalanceUsed { get; set; }
+    public long GatewayAmountPaid { get; set; }
+    public long VatAmount { get; set; }
+    public PaymentStatus PaymentStatus { get; set; }
+    public DateTime? PaymentDate { get; set; }
+    public DeliveryStatus DeliveryStatus { get; set; }
+    public string? TrackingCode { get; set; }
+    public string? DeliveryDescription { get; set; }
+    public DateTime Created { get; set; }
+    public UserAddressDto Address { get; set; }
+    public List<OrderItemDto> Items { get; set; } = new();
+}
+
+public class UserAddressDto
+{
+    public string Title { get; set; }
+    public string Address { get; set; }
+    public string PostalCode { get; set; }
+}
+
+public class OrderItemDto
+{
+    public long ProductId { get; set; }
+    public string ProductTitle { get; set; }
+    public int Count { get; set; }
+    public long UnitPrice { get; set; }
+    public int DiscountPercentUsed { get; set; }
+    public long DiscountAmount { get; set; }
+    public long FinalPrice { get; set; }
+}