Update app.py

app.py

@@ -7,6 +7,7 @@ from smolagents import DuckDuckGoSearchTool
 from tools import get_hub_stats
 from langchain.tools import Tool
 from langchain_huggingface import HuggingFaceEndpoint, ChatHuggingFace
+from langchain_openai import ChatOpenAI
 
 # (Keep Constants as is)
 # --- Constants ---