[Feature Request] Add sportarr server type

[Sportarr]

Hi. I build Sportarr (https://github.com/Sportarr/Sportarr), a sports event manager that speaks the Sonarr v3 contract (leagues surface as series, events as episodes). People already point Seerr at it through that compatibility, and I'd like it to be a first-class server type instead. I've built and validated a working implementation on a branch (a SportarrAPI extending SonarrAPI the way Whisparr rides Radarr across the ecosystem, its own settings section and modal, full test suite and production build passing, verified end to end against a live instance). Before opening a PR I want to ask whether that's something you'd accept and how you'd want it shaped. One design point worth your input up front: discovery is TMDB-keyed today, so sports requests only work where a league maps to a browsable entry; first-class sports discovery backed by Sportarr's public metadata API feels like a natural phase 2 but needs your direction. Happy to adapt the work to whatever structure you prefer.