Fix user info response

lib/models/user_info.dart

@@ -10,10 +10,13 @@ class UserInfo {
   });
 
   factory UserInfo.fromJson(Map<String, dynamic> json) {
+    // Handle wrapped response from API (e.g., {"success": {...}})
+    final data = json.containsKey('success') ? json['success'] : json;
+
     return UserInfo(
-      id: json['id'] as int,
+      id: data['id'] as int,
-      name: json['name'] as String?,
+      name: data['name'] as String?,
-      username: json['username'] as String?,
+      username: data['username'] as String?,
     );
   }