The web interface is by default disabled since Kodi 19, but can be enabled via GUI. Yes it's Kodi 19.1 since this is what Debian ships on Bullseye: https://packages.debian.org/bullseye/kodi
If keyboard and mouse do not work, that's of course a problem. Is it the same when simply calling the kodi command or kodi --standalone from command line? As you found out about the missing plugin repository, obviously input worked at first.
If keyboard and mouse do not work, that's of course a problem. Is it the same when simply calling the kodi command or kodi --standalone from command line? As you found out about the missing plugin repository, obviously input worked at first.