Refactor code structure for improved readability and maintainability

src/Billing/Controller/BillingController.php

@@ -38,6 +38,7 @@ class BillingController extends BaseController
         private readonly InsuranceRepository        $insuranceRepo,
         private readonly ClaimStatusLogRepository  $statusLogRepo,
         private readonly PatientRecordScopeResolver $scopeResolver,
+        private readonly \App\UserProfile\Repository\UserProfileRepository $profileRepo,
     ) {}
 
     /**
@@ -237,12 +238,14 @@ class BillingController extends BaseController
 
         $result  = $this->invoiceService->patientInvoiceList($entityType, $entityId, $record->getId(), $page, $limit);
         $patient = $record->getUser();
+        // کد ملی روی پروفایل ذخیره می‌شود؛ users.national_code برای بیمارِ ساخته‌شده در نوبت‌دهی خالی است.
+        $nationalCode = $this->profileRepo->findByUser($patient)?->getNationalCode() ?? $patient->getNationalCode();
 
         return $this->success([
             'patient' => [
                 'uuid'          => $record->getUuid(),
                 'name'          => $patient->getRealName(),
-                'national_code' => $patient->getNationalCode(),
+                'national_code' => $nationalCode,
             ],
             'data'    => $result['items'],
             'summary' => $result['summary'],