I use dwarf fortress for this but the learning curve is pretty steep as it can be a bit complex but once you get the hang of it and you have a nice fort up and running, you can kindof let it run in the background like an idle game
I’m honestly impressed with the performance of the pi lol
Vikunja will cover all the bases you’re looking for I think! I’ve really been enjoying it
I use dwarf fortress for this but the learning curve is pretty steep as it can be a bit complex but once you get the hang of it and you have a nice fort up and running, you can kindof let it run in the background like an idle game