i found emby to be the easiest and most functional solution over stuff like media assistant or jellyfin. there is a free docker container you can run using minimal space and just add any smb share in the webinterface. just have a shared folder of the downloaded dj sets. e.g. i have most/many solid steel radio shows in a folder and it did not cause any problems. opening stuff to the net and making it not publicly accessible can be easily done with cloudflared.

Do you need a web player? I’ve got several years of a radio show on my web server and wrote a script that created an RSS feed for them. This way I can open that in any podcast player (even web based ones) to listen to it.

mstream maybe? I use it from my job, and it is hosted from my house

DO NOT use funkwhale unless you want a headache.

Jellyfin should be fine. Why do you say it breaks it?

You could just use a local NFO for artist/album with jellyfin, thats what I do for everything from stuff friends have made to home movies and fanedits.

mstream just uses folders, so you can organise however you want.

Apps for Android and iOS, webui for everything else. Does basic (single setting for whole server) transcoding if you wish (I don't for mp3/m4a/ogg sets, I have them on a second server instance, mstream is very light)