Nu77P0inter/jellyfin — reverse-engineered prompt

Build me a free personal media server backend like Jellyfin. I want to point it at folders with my movies, shows, music, and photos, have the server scan them into a library, organize them nicely, and let my devices stream them from home.

It should run on Windows, macOS, and Linux, use C# and modern .NET, and use ffmpeg when a file needs to be converted for playback. Make a clean API that separate web, phone, or TV apps could use, and also allow hosting a static web client if I add one later. Keep it fully self hosted with no premium accounts, no cloud lock in, and no paid features.

Please set up the project so it can be built and run locally, include sensible defaults, basic configuration, logging, and tests where they make sense. Look up the current Jellyfin docs online if you need to match the expected development setup.