There’s a plugin for Jellyfin that will analyze the audio of your content to automatically tag intros, recaps, and credits

If you’re feeling adventurous, you could cut your front panel audio wires and connect them to a new 3.5mm jack inside the case. It might be a lil janky but it would get the job done for <$10

AudioQuest Dragonfly wouldn’t be a bad way to go. I have a Red on my PC because the onboard mobo audio picks up USB noise. I’ve also got a Cobalt for my phone/headphones. They have a firmware update utility for the Red/Black that you manually install and can uninstall afterwards, the Cobalt ships with current FW and hasn’t been updated yet. That said, they’re pretty expensive for what they are and I got both of mine 50+% off. If you’re considering a “proper” audio setup, I’d go straight to to the Denon unit you’re looking at

You’re thinking of adenine when it comes to DNA/RNA

Audio/video contractors are absolutely a thing. It involves a lot of TV mounting, but there’s usually a lot more behind the scenes.

Source: I am one

If it’s cable internet and not fiber/DSL, I’d look at connecting the ISP’s coax to the house’s coax. Provided all of the house’s coax ports are connected to a splitter, you could feed the ISP coax into the nearest port and plug the cable modem into the office port.

My mother is a fish