chore: Add permission serializer to serializers

packages/backend/src/serializers/index.js

@@ -1,9 +1,11 @@
 import userSerializer from './user.js';
 import roleSerializer from './role.js';
+import permissionSerializer from './permission.js';
 
 const serializers = {
   User: userSerializer,
   Role: roleSerializer,
+  Permission: permissionSerializer,
 };
 
 export default serializers;