Fix api_server create db engine

pqai_agent_server/api_server.py

@@ -559,7 +559,7 @@ if __name__ == '__main__':
         chat_history_table=chat_history_db_config['table']
     )
     app.session_manager = session_manager
-    agent_db_engine = create_ai_agent_db_engine(config['database']['ai_agent'])
+    agent_db_engine = create_ai_agent_db_engine()
     app.session_maker = sessionmaker(bind=agent_db_engine)
 
     wecom_db_config = config['storage']['user_relation']