[Feature Request]: 支持配置 Google Fonts 镜像地址

[CH3CHO]

Problem Description

NextChat 在访问时会从 Google Fonts 加载字体信息。由于众所周知的原因，中国大陆访问 Google Fonts 的官方地址 https://fonts.googleapis.com 会有一些困难，导致访问页面时报“Internal Server Error”。

Solution Description

支持通过环境变量自定义镜像地址，例如：

• 谷歌官方镜像：https://fonts.font.im
• 上海交通大学镜像：https://google-fonts.mirrors.sjtug.sjtu.edu.cn

Alternatives Considered

No response

Additional Context

No response

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Title: [Feature Request]: Support configuring Google Fonts mirror address

[sanbei101]

That's true, but mine doesn't have that problem

[Dean-YZG]

Thank you for your feedback, we will adopt the suggestion