use litellm as default model_format

app.py

@@ -5,7 +5,7 @@ import gradio as gr
 import requests
 from lagent.schema import AgentStatusCode
 
-os.system("python -m mindsearch.app --lang cn --model_format internlm_silicon &")
+os.system("python -m mindsearch.app --lang cn --model_format litellm_completion &")
 
 PLANNER_HISTORY = []
 SEARCHER_HISTORY = []
@@ -151,4 +151,4 @@ demo.queue()
 demo.launch(server_name='0.0.0.0',
             server_port=7860,
             inbrowser=True,
-            share=True)
+            share=True)