Add FlatPaymentController with RESTful payment endpoints

Introduced FlatPaymentController under Distribution.Features.Payment, providing GET and POST endpoints at /api/payments. Supports listing, retrieving, and creating payments with filtering and error handling. Business logic is delegated to PaymentService.

Distribution/Features/DriverProfile/DriverProfileService.cs

@@ -1,9 +1,10 @@
 using Distribution.Features.Stock;
+using Distribution.Features.User;
 using Distribution.Infra.UoW;
 
 namespace Distribution.Features.DriverProfile;
 
-public class DriverProfileService(IDriverProfileRepository repo, IUnitOfWork uow)
+public class DriverProfileService(IDriverProfileRepository repo, IUnitOfWork uow, IUserRepository userRepo)
 {
     public async Task<PagedResponse<DriverProfileResponse>> GetAllAsync(int page, int pageSize)
     {
@@ -21,13 +22,17 @@ public class DriverProfileService(IDriverProfileRepository repo, IUnitOfWork uow
 
     public async Task<DriverProfileResponse> CreateAsync(CreateDriverProfileRequest request, CancellationToken ct = default)
     {
-        var existing = await repo.GetByUserIdAsync(request.FK_UserId);
+        var user = await userRepo.GetByIdAsync(request.UserId);
+        if (user is null)
+            throw new KeyNotFoundException($"User {request.UserId} not found");
+
+        var existing = await repo.GetByUserIdAsync(request.UserId);
         if (existing is not null && existing.IsActive)
             throw new InvalidOperationException("An active driver profile already exists for this user");
 
         var profile = new global::Distribution.Models.DriverProfile
         {
-            FK_UserId = request.FK_UserId,
+            FK_UserId = request.UserId,
             LicenseNumber = request.LicenseNumber,
             LicenseExpiry = request.LicenseExpiry,
             MedicalClearanceExpiry = request.MedicalClearanceExpiry