Require Stripe validation to put event online, disable button and block route

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/Controller/AccountController.php

@@ -407,6 +407,12 @@ class AccountController extends AbstractController
             throw $this->createAccessDeniedException();
         }
 
+        if (!$event->isOnline() && (!$user->isStripeChargesEnabled() || !$user->isStripePayoutsEnabled())) {
+            $this->addFlash('error', 'Configuration Stripe requise pour mettre un evenement en ligne.');
+
+            return $this->redirectToRoute('app_account_edit_event', ['id' => $event->getId()]);
+        }
+
         $event->setIsOnline(!$event->isOnline());
         $em->flush();