[feature] use system SOCKS proxy to mirror repositories hosted on Tor

[MattDHill]

This may not be necessary if there is already a setting in Gitea UI to use the proxy. Then we just need to provide instructions.

[EthnTuttle]

go-gitea/gitea#35203
Perhaps this issue can help provide config context that can be surfaced to enable a TOR hidden service interface for mirroring TOR hosted repositories.