Windows has WinGet now, which is a built in package manager. It might not be as good as most linux distro package managers, but it does exist.

I’m using Zoho. It’s pretty cheap and wasn’t hard to set up with my domain.

Oddly it doesn’t load in Firefox but works fine in Chrome. Firefox shows this error:

On the positive side, if your vaultwarden server dies, the cached vault on any/all of your devices can be logged into and export the vault.

Why would your Jellyfin traffic need to go over the Internet if it’s on your local network? You should be able to install the Jellyfin app on your smart TV/Roku/etc or use the web client from a computer, point it at the Jellyfin local IP address, and view it over your LAN.