Vaultwarden is what I use: https://github.com/dani-garcia/vaultwarden/
Their wiki is pretty good assuming you’re comfortable with Docker.
Back before I self-hosted, KeePassXC for desktop and Keepass2Android for mobile (along with Synching to sync the database) got the job done.
The Bolt EUV is the only reason we have an electric car now (personally, I would have gotten the smaller and cheaper Bolt but it was a family decision to go with the EUV). It was reasonable for what you get. The only downside is the slower charging compared to other EVs but I don’t plan on taking it for longer trips. We have an ICE for that.