Not a full answer but yes it’s a system app. I tried to get rid of it a while back but you needed root to do it. It’s absolutely unconscionable that Samsung hasn’t given people a toggle to disable it.

Immich is really good actually. Completely replaced Google Photos for me.

100W while idling seems like way too much?

Edit: maybe not, they list 75W for whole system idle here with 5800X3D.