feat: add referral_code

app/Http/Controllers/UserController.php

@@ -638,6 +638,10 @@ public function status(Request $request)
                 ->first();
         }
 
+        // Expose the referrer's uuid so downstream apps can resolve the
+        // referral relationship (کد معرف) against their own local user.
+        $user['referrer_uuid'] = $user->referred_by ? optional($user->referrer)->uuid : null;
+
         return $user;
     }