Extend subuser permission system and refactor route permission handling

- Update `subusersRoute` to support subuser authentication and permission checks dynamically.
- Add new permission nodes (`SELFSERVE_LIST`, `SELFSERVE_EDIT`, `SELFSERVE_DELETE`) in `subusers_permission_node_key`.
- Fix typos in vehicle permission constants and ensure proper resolution.
- Enhance `vehiclesRoute` with effective customer context and scoped permission checks.
- Localize new permission nodes with descriptions in Danish.

services/nginx/app/routes/vehiclesRoute.php

@@ -57,6 +57,17 @@ class vehiclesRoute
             // Listing: restrict to effective customer when lacking the broader permission
             $vehicles_o = new customer_vehicles_o();
             $effectiveCustomer = self::resolveEffectiveCustomerNumber();
+            $permitted = self::allowOwnOrDepartmentAccess(
+                $permission_own,
+                $permission_other,
+                $effectiveCustomer,
+                null,
+                null,
+                'You do not have permission to view vehicles.'
+            );
+            if (!$permitted) {
+                $response->error('You do not have permission to view vehicles.');
+            }
             $response->success(
                 $vehicles_o->listObjectsWithPaginationIfSet(
                     function ($vehicle) {