feat(billing): renewals, coupons, VAT numbering, billing cycles and invoice payment tracking

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

app/Http/Controllers/Api/Admin/Service/ServiceController.php

@@ -16,6 +16,8 @@ use Illuminate\Http\JsonResponse;
 use Illuminate\Support\Collection;
 use Illuminate\Http\Request;
 use Illuminate\Support\Facades\DB;
+use Illuminate\Validation\Rule;
+use App\Support\BillingCycleCatalog;
 
 class ServiceController extends Controller
 {
@@ -61,7 +63,7 @@ class ServiceController extends Controller
     {
         $data = $request->validate([
             'domain' => 'required|string|max:255',
-            'billing_cycle' => 'nullable|in:monthly,quarterly,semi_annually,annually,biennially,triennially',
+            'billing_cycle' => ['nullable', Rule::in(BillingCycleCatalog::codes())],
         ]);
 
         $pricing = DomainPricing::matchDomain($data['domain']);