feat: Implement user permission checks and manual payment functionalities

- Added CheckUserPermissionQuery and CheckUserPermissionQueryHandler for permission validation.
- Introduced GetUserRolesQuery and GetUserRolesQueryHandler to retrieve user roles.
- Created IPermissionService interface and its implementation in PermissionService.
- Defined permission and role constants in PermissionDefinitions.
- Developed SetDefaultVatPercentageCommand and its handler for VAT configuration.
- Implemented GetCurrentVatPercentageQuery and handler to fetch current VAT settings.
- Added manual payment commands: CreateManualPayment, ApproveManualPayment, and RejectManualPayment with respective handlers and validators.
- Created GetManualPaymentsQuery and handler for retrieving manual payment records.
- Integrated gRPC services for manual payments with appropriate permission checks.
- Established Protobuf definitions for manual payment operations and metadata.

src/BackOffice.BFF.Application/UserOrderCQ/Commands/CancelOrder/CancelOrderCommandValidator.cs

@@ -15,53 +15,3 @@ public class CancelOrderCommandValidator : AbstractValidator<CancelOrderCommand>
             .WithMessage("دلیل لغو سفارش الزامی است");
     }
 }
-
-*** Add File: BackOffice.BFF/src/BackOffice.BFF.Application/UserOrderCQ/Commands/CancelOrder/CancelOrderCommandHandler.cs
-using BackOffice.BFF.Application.Common.Interfaces;
-using BackOffice.BFF.UserOrder.Protobuf.Protos.UserOrder;
-using CMSMicroservice.Protobuf.Protos.UserOrder;
-using MediatR;
-using Microsoft.Extensions.Logging;
-
-namespace BackOffice.BFF.Application.UserOrderCQ.Commands.CancelOrder;
-
-public class CancelOrderCommandHandler : IRequestHandler<CancelOrderCommand, CancelOrderResponse>
-{
-    private readonly IApplicationContractContext _context;
-    private readonly ILogger<CancelOrderCommandHandler> _logger;
-
-    public CancelOrderCommandHandler(
-        IApplicationContractContext context,
-        ILogger<CancelOrderCommandHandler> logger)
-    {
-        _context = context;
-        _logger = logger;
-    }
-
-    public async Task<CancelOrderResponse> Handle(CancelOrderCommand request, CancellationToken cancellationToken)
-    {
-        var grpcRequest = new CMSMicroservice.Protobuf.Protos.UserOrder.CancelOrderRequest
-        {
-            OrderId = request.OrderId,
-            CancelReason = request.CancelReason ?? string.Empty,
-            RefundPayment = request.RefundPayment
-        };
-
-        var response = await _context.UserOrders.CancelOrderAsync(grpcRequest, cancellationToken: cancellationToken);
-
-        _logger.LogInformation(
-            "Cancelled order {OrderId}. Status={Status} RefundProcessed={RefundProcessed}",
-            response.OrderId,
-            response.Status,
-            response.RefundProcessed);
-
-        return new CancelOrderResponse
-        {
-            OrderId = response.OrderId,
-            Status = (int)response.Status,
-            Message = response.Message,
-            RefundProcessed = response.RefundProcessed
-        };
-    }
-}
-