添加百川智能模型

[WHMyyds]

支持baichuan模型（百小应）

[syfantasy]

百川的官方api是适配openai格式调用的，你只需要按照官方文档，把反代修改为https://api.baichuan-ai.com/v1 ，然后填入你自己的key和可用的模型名称，就能在API模式调用了

[github-actions]

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