👑[Enhancement] 解决对github ssh连接出错的问题

### 🥰 需求描述(Description)

因为 ssh 本身访问github是畅通无阻的，这种方式访问没有任何阻碍，所以可以删除这一支持。

### 🧐 解决方案(Solution)

删除支持github的相关ssh的东西，或者开一个专用的ssh隧道，使可以在Hosts模式下放行ssh连接。

Start by tracing the existing GitHub SSH support and the Hosts mode entry point. Clarify whether the intended result is removing GitHub SSH support or adding a dedicated SSH tunnel that Hosts mode can allow. Done means the chosen behavior works for GitHub SSH connections and the existing access mode remains consistent.

Written by the indexing model from the issue text.