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; }
+}

src/CMSMicroservice.Application/DiscountShopCQ/Queries/GetOrderById/GetOrderByIdQueryHandler.cs

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+using CMSMicroservice.Application.Common.Interfaces;
+using MediatR;
+using Microsoft.EntityFrameworkCore;
+
+namespace CMSMicroservice.Application.DiscountShopCQ.Queries.GetOrderById;
+
+public class GetOrderByIdQueryHandler : IRequestHandler<GetOrderByIdQuery, OrderDetailDto?>
+{
+    private readonly IApplicationDbContext _context;
+
+    public GetOrderByIdQueryHandler(IApplicationDbContext context)
+    {
+        _context = context;
+    }
+
+    public async Task<OrderDetailDto?> Handle(GetOrderByIdQuery request, CancellationToken cancellationToken)
+    {
+        var order = await _context.DiscountOrders
+            .Where(o => o.Id == request.OrderId && o.UserId == request.UserId)
+            .Include(o => o.UserAddress)
+            .Include(o => o.OrderDetails)
+                .ThenInclude(od => od.Product)
+            .FirstOrDefaultAsync(cancellationToken);
+
+        if (order == null)
+            return null;
+
+        return new OrderDetailDto
+        {
+            Id = order.Id,
+            UserId = order.UserId,
+            TotalAmount = order.TotalAmount,
+            DiscountBalanceUsed = order.DiscountBalanceUsed,
+            GatewayAmountPaid = order.GatewayAmountPaid,
+            VatAmount = order.VatAmount,
+            PaymentStatus = order.PaymentStatus,
+            PaymentDate = order.PaymentDate,
+            DeliveryStatus = order.DeliveryStatus,
+            TrackingCode = order.TrackingCode,
+            DeliveryDescription = order.DeliveryDescription,
+            Created = order.Created,
+            Address = new UserAddressDto
+            {
+                Title = order.UserAddress.Title,
+                Address = order.UserAddress.Address,
+                PostalCode = order.UserAddress.PostalCode
+            },
+            Items = order.OrderDetails.Select(od => new OrderItemDto
+            {
+                ProductId = od.ProductId,
+                ProductTitle = od.Product.Title,
+                Count = od.Count,
+                UnitPrice = od.UnitPrice,
+                DiscountPercentUsed = od.DiscountPercentUsed,
+                DiscountAmount = od.DiscountAmount,
+                FinalPrice = od.FinalPrice
+            }).ToList()
+        };
+    }
+}