Use provider=auto instead of hardcoding novita

Novita specifically may not have spend authorized on this account; auto
lets huggingface_hub pick the first provider actually available/authorized
for the user rather than failing on one specific provider.

app.py

@@ -228,7 +228,7 @@ class BasicAgent:
                 ],
             model= InferenceClientModel(
                 "Qwen/Qwen3-235B-A22B-Instruct-2507",
-                provider="novita",
+                provider="auto",
                 temperature=0.3,
             ),
             additional_authorized_imports=["pandas", "requests", "re", "io"],