feat: update voucher purchase urls to match established patterns

src/Controller/Voucher/Step1Controller.php

@@ -38,7 +38,7 @@ class Step1Controller extends AbstractVoucherPurchaseController
         parent::__construct($sessionManager, $thumbnailResolver);
     }
 
-    #[Route('/gutschein/auswahl', name: 'app_voucher_step_1')]
+    #[Route('/vouchers/create/design', name: 'app_voucher_step_1')]
     public function index(Request $request): Response
     {
         $dto = $this->sessionManager->find($request);
@@ -67,7 +67,7 @@ class Step1Controller extends AbstractVoucherPurchaseController
     /**
      * Takes over the current input without validating it and refreshes the summary.
      */
-    #[Route('/gutschein/auswahl/aktualisieren', name: 'app_voucher_step_1_refresh', methods: ['POST'])]
+    #[Route('/vouchers/create/refresh', name: 'app_voucher_step_1_refresh', methods: ['POST'])]
     public function refresh(Request $request): Response
     {
         $dto = $this->sessionManager->find($request);
@@ -94,7 +94,7 @@ class Step1Controller extends AbstractVoucherPurchaseController
      * Takes over the current input like refresh() and opens the preview modal, whose frame loads
      * the PDF from previewPdf().
      */
-    #[Route('/gutschein/auswahl/vorschau', name: 'app_voucher_preview', methods: ['POST'])]
+    #[Route('/vouchers/create/preview', name: 'app_voucher_preview', methods: ['POST'])]
     public function preview(Request $request): Response
     {
         $dto = $this->sessionManager->find($request);
@@ -118,7 +118,7 @@ class Step1Controller extends AbstractVoucherPurchaseController
         ]);
     }
 
-    #[Route('/gutschein/vorschau.pdf', name: 'app_voucher_preview_pdf', methods: ['GET'])]
+    #[Route('/vouchers/create/preview.pdf', name: 'app_voucher_preview_pdf', methods: ['GET'])]
     public function previewPdf(Request $request): Response
     {
         try {