Update api_service.py

api_service.py

@@ -16,7 +16,7 @@ from langchain_core.runnables import RunnablePassthrough
 from langchain_core.documents import Document
 
 import chromadb
-from langchain_community.vectorstores import Chroma  # ✅ Updated import
+from langchain_chroma import Chroma  # ✅ Updated import
 
 # --- 1. Environment & Constants ---
 load_dotenv()