Update default model name in _create_kg_agent

Author: gkorland

api/llm.py

@@ -237,7 +237,7 @@ def _define_ontology() -> Ontology:
 def _create_kg_agent(repo_name: str):
     global ontology
 
-    model_name = os.getenv('MODEL_NAME', 'gemini/gemini-2.0-flash-001')
+    model_name = os.getenv('MODEL_NAME', 'gemini/gemini-2.0-flash')
 
     model = LiteModel(model_name)