bug fix

src/llm/loader.py

@@ -3,7 +3,11 @@
 import json
 from pathlib import Path
 from typing import List, Dict, Any
-from langchain.docstore.document import Document
+
+try:
+    from langchain.docstore.document import Document
+except:
+    from langchain_core.documents import Document
 
 
 def load_json(filepath: Path | str) -> List[Dict[str, Any]]: