It would appear Sourcehut has finally caught up with Shadowchat, and the original source repo is now gone. I'm not sure why its 401 unauthorized instead of 404 not found, but I have no idea how they do things.

Forks exist on Lukesmith's forked repo, my own clone on github, and my JP localized version on Gitgud:

・https://github.com/LukeSmithxyz/shadowchat

・https://github.com/ChanoSan/shadowchat

・https://gitgud.io/japananon/shadowchatjp

Links and references on www.shadowchat.app will be updated at the soonest opportunity.