internxt: add Internxt backend - fixes #7610

Co-Authored-By: lullius <lullius@users.noreply.github.com>
Co-Authored-By: StarHack <StarHack@users.noreply.github.com>
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Internal Server Error - Gitea: Git with a cup of tea
500 Internal Server Error

Gitea Version: 1.28.0+dev-477-g8b6ad49a5f