Fix: Remove redundant load_dotenv from graph.py for HF Spaces compatibility

src/graph.py

@@ -7,9 +7,7 @@ from langgraph.checkpoint.sqlite import SqliteSaver
 from.agent_state import AgentState
 from.tools import search_tool, scrape_tool
 
-from dotenv import load_dotenv
- 
-load_dotenv()  # Load environment variables from .env
+# Environment variables are loaded in main.py or set by HF Spaces
 
 llm = ChatGroq(
     model="llama-3.3-70b-versatile",