添加自定义供应商配置界面希望调整一下：无需切换cli,只添加供应商访问的关键信息。

### 你想完成什么 / What are you trying to do

### 已尝试的步骤 / What you have tried

高级参数里面加上：添加模型、添加请求头、测试连接、获取模型列表

### 环境 / Environment

windows平台

Start at the existing custom-provider configuration UI and trace how it currently switches to the CLI and stores provider access details. Compare the requested advanced options—adding models, adding request headers, testing the connection, and fetching the model list—with the current provider flow; done means these actions are available without switching CLI on Windows.

Written by the indexing model from the issue text.