Update subuser_grants_o to use default permissions and remove hardcoded driver permission

- Define `defaultPermissions` constant in `subuser_grants_o` for managing default subuser permissions.
- Adjust `add` method to use `defaultPermissions` instead of a hardcoded array.
- Update `/subusers` route to reflect this change.

services/nginx/app/objects/subuser_grants_o.php

@@ -5,6 +5,7 @@ namespace objects;
 use classes\db;
 use classes\object_property;
 use Exception;
+use modules\subusers\helpers\subusers_permission_node_key;
 use Random\RandomException;
 use traits\db_object_t;
 
@@ -20,6 +21,14 @@ class subuser_grants_o extends db
     public object_property $created_at;
     public object_property $updated_at;
     public object_property $deleted_at;
+    const defaultPermissions = [
+        subusers_permission_node_key::VEHICLES_LIST,
+        subusers_permission_node_key::SELFSERVE_ADD,
+        subusers_permission_node_key::BOOKINGS_LIST,
+        subusers_permission_node_key::BOOKINGS_ADD,
+        subusers_permission_node_key::BOOKINGS_EDIT,
+        subusers_permission_node_key::BOOKINGS_DELETE,
+    ];
 
 
     public function structure(): void
@@ -55,7 +64,7 @@ class subuser_grants_o extends db
      * @return $this
      * @throws Exception If the object creation fails
      */
-    public function add(int $billing_customer_number, int $subuser, bool $enabled, ?string $note, ?array $permissions = ['driver']): subuser_grants_o
+    public function add(int $billing_customer_number, int $subuser, bool $enabled, ?string $note, ?array $permissions = self::defaultPermissions): subuser_grants_o
     {
         global $db;
         $tmp = $this->add_object([