Allow AI chatbots to use third-party (custom provider) models

[AnnAngela]

Not all users use first-party service providers since the prices are too high.

Please add some options to allow users to configure AI chatbots to use third-party (custom provider) models.

[koshkiicobaka]

I just can't agree more. Especially for me in China, none of the chatbots currently provided (showed in the uploaded screenshot) can be used due to network causes (such as the GFW) and policy limitations. I wish that users can be free to use third-party models like Qianwen, Deepseek and others so that users in China can use this function more fluently.