Fix QR code URL: use app_order_public instead of removed app_ticket_verify

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

src/Service/BilletOrderService.php

@@ -55,8 +55,8 @@ class BilletOrderService
 
         $design = $this->em->getRepository(BilletDesign::class)->findOneBy(['event' => $event]);
 
-        $qrData = $this->urlGenerator->generate('app_ticket_verify', [
-            'reference' => $ticket->getReference(),
+        $qrData = $this->urlGenerator->generate('app_order_public', [
+            'reference' => $order->getReference(),
         ], UrlGeneratorInterface::ABSOLUTE_URL);
 
         $qrCode = (new Builder(