配置model_format为internlm_silicon，报错：Invalid token

配置为internlm_silicon，请求后端时报错invalid token，硅基的API key已配置

报错信息如下：
```
python -m mindsearch.app --lang cn --model_format internlm_silicon --search_engine DuckDuckGoSearch --asy
INFO: Started server process [10608]
INFO: Waiting for application startup.
INFO: Application startup complete.
INFO: Uvicorn running on http://0.0.0.0:8002 (Press CTRL+C to quit)
C:\Users\MI\.pyenv\pyenv-win\versions\3.10.0\lib\site-packages\lagent\llms\openai.py:513: DeprecationWarning: `top_k` parameter is deprecated in OpenAI APIs.
warnings.warn('`top_k` parameter is deprecated in OpenAI APIs.',
C:\Users\MI\.pyenv\pyenv-win\versions\3.10.0\lib\site-packages\lagent\agents\stream.py:212: UserWarning: Neither plugin nor interpreter executor is initialized. An exception will be thrown when the agent call a tool.
warnings.warn(
INFO: 127.0.0.1:63318 - "POST /solve HTTP/1.1" 200 OK
"Invalid token"
```