properly loading .env file with dotenv

services/rag/langchain/retrieval.py

@@ -2,6 +2,7 @@
 
 import os
 from typing import List, Optional
+from dotenv import load_dotenv
 from langchain_core.retrievers import BaseRetriever
 from langchain_core.callbacks import CallbackManagerForRetrieverRun
 from langchain_core.documents import Document
@@ -9,6 +10,9 @@ from loguru import logger
 
 from vector_storage import initialize_vector_store
 
+# Load environment variables
+load_dotenv()
+
 
 class VectorStoreRetriever(BaseRetriever):
     """