[Feature] 支持 DeepSeek-R1 模型，及其思考过程的展示

[DillionApple]

Problem Description
The API of DeepSeek-R1 supports the reasoning_content field to display chain-of-thought content. It is hoped that LobeChat can support this as well.

Proposed Solution
Support the reasoning_content field to display in different styles.

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问题描述
DeepSeek-R1 的 API 支持 reasoning_content 字段来展示思维链内容。希望 lobechat 能够支持

解决思路
支持 reasoning_content 以不同的样式展示

[EvanSong77]

+1, we need it.

[forMwish]

+1

[pguyennet]

+1 thanks

[EvanSong77]

xdm 可以试试Cherry Studio，这个支持了，用了一天，挺好用的

[lgjssn]

+1, 看更新日志1.9.1说是支持了, 但是r1根本没效果