Update BasicAgent to use Groq as the provider instead of HuggingFace

app.py

@@ -18,7 +18,7 @@ class BasicAgent:
     """Is a langgraph agent."""
     def __init__(self):
         print("BasicAgent initialized.")
-        self.graph = build_graph(provider="huggingface")
+        self.graph = build_graph(provider="groq")
 
     def __call__(self, question: str) -> str:
         print(f"Agent received question (first 50 chars): {question[:50]}...")