[Feature]: 新增评论通知渠道 ntfy || [Feature]: Added comment notification channel ntfy

[0x5c0f]

功能概述 | Describe the feature

需求:

希望增加新的评论通知渠道 ntfy, 或者增加自定义的webhook 。目前我是部署在vercel上的，已测试邮件通知，但似乎是无法成功通知的，希望能增加ntfy或者自定义的webhook,用于解决类似问题.

参考链接:

https://github.com/binwiederhier/ntfy
https://ntfy.sh

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Feature Overview | Describe the feature

need:

I hope to add a new comment notification channel ntfy, or add a custom webhook. Currently, I deploy it on vercel and have tested the email notification, but it seems that the notification cannot be successful. I hope to add ntfy or a customized webhook to solve similar problems.

Reference link:

https://github.com/binwiederhier/ntfy
https://ntfy.sh

[lizheming]

WEBHOOK 看一下这个， https://waline.js.org/reference/server/env.html#%E9%AB%98%E7%BA%A7%E9%85%8D%E7%BD%AE