Try to fix "supabase_url is required"

agents.py

@@ -15,6 +15,8 @@ from langchain_core.tools import tool
 from langchain.tools.retriever import create_retriever_tool
 from supabase.client import Client, create_client
 
+load_dotenv()
+
 class BasicAgent:
     def __init__(self):
         print("BasicAgent initialized.")