feat: Add Protobuf definitions for Network Membership service

- Introduced `networkmembership.proto` with RPC methods for retrieving user network tree, statistics, and position.
- Implemented HTTP annotations for gRPC transcoding in the service methods.
- Added support for Google API annotations in `annotations.proto` and `http.proto`.
- Created `ConfigureServices.cs` to register FluentValidation for the Protobuf services.
- Updated project file to include necessary dependencies for gRPC and Protobuf.

src/FrontOffice.BFF.Application/DiscountShopCQ/Commands/PlaceDiscountOrder/PlaceDiscountOrderCommand.cs

@@ -0,0 +1,39 @@
+namespace FrontOffice.BFF.Application.DiscountShopCQ.Commands.PlaceDiscountOrder;
+
+/// <summary>
+/// ثبت سفارش از سبد خرید تخفیفی
+/// </summary>
+public record PlaceDiscountOrderCommand : IRequest<PlaceDiscountOrderResponseDto>
+{
+    /// <summary>
+    /// شناسه آدرس کاربر
+    /// </summary>
+    public long UserAddressId { get; init; }
+    
+    /// <summary>
+    /// مقدار استفاده از موجودی تخفیف (اختیاری)
+    /// </summary>
+    public long DiscountBalanceToUse { get; init; }
+    
+    /// <summary>
+    /// توضیحات
+    /// </summary>
+    public string? Notes { get; init; }
+}
+
+public class PlaceDiscountOrderResponseDto
+{
+    public bool Success { get; set; }
+    public string Message { get; set; } = string.Empty;
+    public long OrderId { get; set; }
+    
+    /// <summary>
+    /// مبلغ قابل پرداخت از درگاه
+    /// </summary>
+    public long GatewayAmount { get; set; }
+    
+    /// <summary>
+    /// لینک پرداخت (اگر نیاز باشد)
+    /// </summary>
+    public string? PaymentUrl { get; set; }
+}

src/FrontOffice.BFF.Application/DiscountShopCQ/Commands/PlaceDiscountOrder/PlaceDiscountOrderCommandHandler.cs

@@ -0,0 +1,41 @@
+using CMSMicroservice.Protobuf.Protos.DiscountOrder;
+
+namespace FrontOffice.BFF.Application.DiscountShopCQ.Commands.PlaceDiscountOrder;
+
+public class PlaceDiscountOrderCommandHandler : IRequestHandler<PlaceDiscountOrderCommand, PlaceDiscountOrderResponseDto>
+{
+    private readonly IApplicationContractContext _context;
+    private readonly ICurrentUserService _currentUserService;
+
+    public PlaceDiscountOrderCommandHandler(IApplicationContractContext context, ICurrentUserService currentUserService)
+    {
+        _context = context;
+        _currentUserService = currentUserService;
+    }
+
+    public async Task<PlaceDiscountOrderResponseDto> Handle(PlaceDiscountOrderCommand request, CancellationToken cancellationToken)
+    {
+        var userId = _currentUserService.UserId ?? throw new UnauthorizedAccessException("User not authenticated");
+
+        var cmsRequest = new PlaceOrderRequest
+        {
+            UserId = userId,
+            UserAddressId = request.UserAddressId,
+            DiscountBalanceToUse = request.DiscountBalanceToUse
+        };
+
+        if (!string.IsNullOrEmpty(request.Notes))
+            cmsRequest.Notes = request.Notes;
+
+        var response = await _context.DiscountOrders.PlaceOrderAsync(cmsRequest, cancellationToken: cancellationToken);
+
+        return new PlaceDiscountOrderResponseDto
+        {
+            Success = response.Success,
+            Message = response.Message,
+            OrderId = response.OrderId,
+            GatewayAmount = response.GatewayAmount,
+            PaymentUrl = response.PaymentUrl
+        };
+    }
+}