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

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

app/Helpers/OrderHelper.php

@@ -2,7 +2,7 @@
 
 namespace App\Helpers;
 
-use App\Enums\Product\ProductBillingCycle;
+use App\Support\BillingCycleCatalog;
 use App\Models\Invoice;
 use App\Models\Order;
 use Illuminate\Support\Str;
@@ -37,9 +37,9 @@ class OrderHelper
      */
     public static function cycleToMonths(?string $cycle): int
     {
-        $enum = ProductBillingCycle::tryFrom($cycle ?? '')
+        $months = BillingCycleCatalog::monthsFor($cycle)
             ?? throw new \InvalidArgumentException("Unknown billing cycle: " . ($cycle ?? 'null'));
 
-        return $enum === ProductBillingCycle::ONE_TIME ? 1 : $enum->months();
+        return $months ?: 1;
     }
 }