[Feature]模型切换的二级菜单

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问题描述
目前在使用中切换模型，可以切换同一个模型提供商的不同模型，但是如果要切换模型提供商，就必须在设置里进行切换，中间流程有点复杂。

解决思路
能否在目前对话界面模型切换选项的左侧，增加一个选项切换按钮，这样就有两个模型切换按钮，左侧那妞切换模型服务提供商，右侧按钮切换统一厂商的不同模型；
或者在目前对话界面模型切换选项的基础上，增加二级菜单，一级菜单切换模型服务提供商，二级菜单按钮切换统一厂商的不同模型；

附加上下文
请提供任何其他上下文或信息，以便更好地理解您的功能请求，例如截图、示例或用例。

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Problem Description
Currently switching models in use allows you to switch different models from the same model provider, but if you want to switch model providers, you have to do it in the settings, which makes the intermediate process a bit complicated.

Proposed Solution
Could an option switch button be added to the left side of the current dialog interface model switching options, so that there are two model switching buttons, the left one switching the model service provider and the right one switching the different models of the unified vendor;
Or add a secondary menu to the current dialog interface model switching options, with the first menu switching model service providers and the secondary menu button switching different models from a unified vendor;

Additional Context

Thanks a lot!