Add conditional check for self-request in userRoute and fix customer_number type in orderBookingRoute

- Updated `getUserId` logic in `userRoute` to allow users to fetch their own user ID without requiring additional permissions.
- Corrected `customer_number` type in `orderBookingRoute` to always return an array.

services/nginx/app/routes/orderBookingRoute.php

@@ -110,7 +110,7 @@ class orderBookingRoute
                         'department' => $user->getGroup()->getDepartments()
                     ] : []),
                     ...(!$has_permission_other ? [
-                        'customer_number' => (int)$user->customer_number->value()
+                        'customer_number' => [(int)$user->customer_number->value()]
                     ] : [])
                 ])
             ));