First check to make sure you are monitoring for all seasons and episodes not just new ones.
Next, Sonarr works by checking RSS feeds for new torrents that match what you’re monitoring.
No new torrents for that show = no downloads.
You need to use the Search button on a show, season, or episode for it to search existing torrents and download them.
The usual go to for self hosted password managers is VaultWarden. There’s no deb or rpm package but you can get it spun up with docker pretty easily. Any reason you’re specifically looking for “included” or packaged solutions? That’s going to severely limit your options.