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/Commands/PlaceOrder/PlaceOrderCommandHandler.cs

@@ -0,0 +1,169 @@
+using CMSMicroservice.Application.Common.Interfaces;
+using CMSMicroservice.Domain.Entities.DiscountShop;
+using CMSMicroservice.Domain.Entities.Payment;
+using CMSMicroservice.Domain.Enums;
+using MediatR;
+using Microsoft.EntityFrameworkCore;
+
+namespace CMSMicroservice.Application.DiscountShopCQ.Commands.PlaceOrder;
+
+public class PlaceOrderCommandHandler : IRequestHandler<PlaceOrderCommand, PlaceOrderResponseDto>
+{
+    private readonly IApplicationDbContext _context;
+
+    public PlaceOrderCommandHandler(IApplicationDbContext context)
+    {
+        _context = context;
+    }
+
+    public async Task<PlaceOrderResponseDto> Handle(PlaceOrderCommand request, CancellationToken cancellationToken)
+    {
+        // Get user wallet
+        var userWallet = await _context.UserWallets
+            .FirstOrDefaultAsync(w => w.UserId == request.UserId, cancellationToken);
+
+        if (userWallet == null)
+        {
+            return new PlaceOrderResponseDto
+            {
+                Success = false,
+                Message = "کیف پول کاربر یافت نشد"
+            };
+        }
+
+        // Get cart items with products
+        var cartItems = await _context.DiscountShoppingCarts
+            .Where(c => c.UserId == request.UserId)
+            .Include(c => c.Product)
+            .ToListAsync(cancellationToken);
+
+        if (!cartItems.Any())
+        {
+            return new PlaceOrderResponseDto
+            {
+                Success = false,
+                Message = "سبد خرید خالی است"
+            };
+        }
+
+        // Validate stock and calculate totals
+        long totalAmount = 0;
+        long totalDiscountAmount = 0;
+        var orderDetails = new List<DiscountOrderDetail>();
+
+        foreach (var cartItem in cartItems)
+        {
+            var product = cartItem.Product;
+
+            // Check stock
+            if (product.RemainingCount < cartItem.Count)
+            {
+                return new PlaceOrderResponseDto
+                {
+                    Success = false,
+                    Message = $"موجودی محصول '{product.Title}' کافی نیست"
+                };
+            }
+
+            // Check if product is active
+            if (!product.IsActive)
+            {
+                return new PlaceOrderResponseDto
+                {
+                    Success = false,
+                    Message = $"محصول '{product.Title}' غیرفعال است"
+                };
+            }
+
+            // Calculate discount for this product
+            var itemTotal = product.Price * cartItem.Count;
+            var maxDiscountForItem = (itemTotal * product.MaxDiscountPercent) / 100;
+
+            totalAmount += itemTotal;
+            totalDiscountAmount += maxDiscountForItem;
+
+            orderDetails.Add(new DiscountOrderDetail
+            {
+                ProductId = product.Id,
+                Count = cartItem.Count,
+                UnitPrice = product.Price,
+                DiscountPercentUsed = product.MaxDiscountPercent,
+                DiscountAmount = maxDiscountForItem,
+                FinalPrice = itemTotal - maxDiscountForItem
+            });
+        }
+
+        // Validate discount balance usage
+        var maxDiscountBalanceUsable = totalDiscountAmount;
+        var actualDiscountBalanceUsed = Math.Min(request.DiscountBalanceToUse, maxDiscountBalanceUsable);
+        actualDiscountBalanceUsed = Math.Min(actualDiscountBalanceUsed, userWallet.DiscountBalance);
+
+        if (actualDiscountBalanceUsed < request.DiscountBalanceToUse)
+        {
+            return new PlaceOrderResponseDto
+            {
+                Success = false,
+                Message = $"موجودی تخفیف کافی نیست. حداکثر قابل استفاده: {maxDiscountBalanceUsable:N0} تومان، موجودی شما: {userWallet.DiscountBalance:N0} تومان"
+            };
+        }
+
+        var gatewayAmountRequired = totalAmount - actualDiscountBalanceUsed;
+
+        // Calculate VAT (9%)
+        var vatAmount = (gatewayAmountRequired * 9) / 100;
+        var finalGatewayAmount = gatewayAmountRequired + vatAmount;
+
+        // Create transaction for gateway payment
+        var transaction = new Transaction
+        {
+            Amount = finalGatewayAmount,
+            Description = $"خرید از فروشگاه تخفیف - مبلغ کل: {totalAmount:N0}، اعتبار تخفیف: {actualDiscountBalanceUsed:N0}",
+            PaymentStatus = PaymentStatus.Pending,
+            Type = TransactionType.DiscountShopPurchase
+        };
+
+        _context.Transactions.Add(transaction);
+        await _context.SaveChangesAsync(cancellationToken);
+
+        // Create order
+        var order = new DiscountOrder
+        {
+            UserId = request.UserId,
+            TotalAmount = totalAmount,
+            DiscountBalanceUsed = actualDiscountBalanceUsed,
+            GatewayAmountPaid = finalGatewayAmount,
+            VatAmount = vatAmount,
+            PaymentStatus = PaymentStatus.Pending,
+            TransactionId = transaction.Id,
+            UserAddressId = request.UserAddressId,
+            DeliveryStatus = DeliveryStatus.Pending
+        };
+
+        _context.DiscountOrders.Add(order);
+        await _context.SaveChangesAsync(cancellationToken);
+
+        // Add order details
+        foreach (var detail in orderDetails)
+        {
+            detail.DiscountOrderId = order.Id;
+        }
+
+        _context.DiscountOrderDetails.AddRange(orderDetails);
+
+        // Clear cart
+        _context.DiscountShoppingCarts.RemoveRange(cartItems);
+
+        await _context.SaveChangesAsync(cancellationToken);
+
+        return new PlaceOrderResponseDto
+        {
+            Success = true,
+            Message = "سفارش ایجاد شد. لطفا پرداخت را تکمیل کنید",
+            OrderId = order.Id,
+            TransactionId = transaction.Id,
+            TotalAmount = totalAmount,
+            DiscountBalanceUsed = actualDiscountBalanceUsed,
+            GatewayAmountRequired = finalGatewayAmount
+        };
+    }
+}