feat(payment): implement OxaPay provider and non-recurring subscription sync

- Add comprehensive OxaPay payment provider with invoice creation, webhook processing, and subscription status sync
  - Implement conditional payload fields (to_currency, callback_url) based on configuration
  - Create universal sync command for all non-recurring payment providers
  - Add subscription model fields for payment tracking
  - Implement proper status mapping between OxaPay and Laravel subscription states
  - Add webhook signature validation using HMAC SHA512

routes/web.php

@@ -2,27 +2,6 @@
 
 use App\Http\Controllers\AppController;
 
-// DEBUG: Test route to check PolarProvider
-Route::get('/debug-polar', function () {
-    try {
-        $provider = new \App\Services\Payments\Providers\PolarProvider;
-
-        return response()->json([
-            'status' => 'success',
-            'provider_class' => get_class($provider),
-            'is_active' => $provider->isActive(),
-            'config' => $provider->getConfiguration(),
-            'sandbox' => $provider->config['sandbox'] ?? 'unknown',
-            'timestamp' => '2025-12-04-17-15-00',
-        ]);
-    } catch (\Exception $e) {
-        return response()->json([
-            'status' => 'error',
-            'message' => $e->getMessage(),
-            'trace' => $e->getTraceAsString(),
-        ]);
-    }
-});
 use App\Http\Controllers\ImpersonationController;
 use App\Http\Controllers\WebhookController;
 use App\Http\Middleware\CheckPageSlug;
@@ -180,7 +159,7 @@ Route::middleware(['auth'])->group(function (): void {
     Route::get('settings/appearance', Appearance::class)->name('settings.appearance');
 });
 
-Route::post('/webhook/oxapay', [WebhookController::class, 'oxapay'])->name('webhook.oxapay');
+Route::post('/webhook/oxapayLegacy', [WebhookController::class, 'oxapay'])->name('webhook.oxapayLegacy');
 
 // Unified Payment System Routes
 require __DIR__.'/payment.php';