Introduce the ability to select the media server type on the setup page. Users can now choose their
preferred media server (e.g., Plex through the Plex sign-in or Emby/Jellyfin sign-in to select
either Emby or Jellyfin). The selected media server type is then reflected in the application
settings. This enhancement provides users with increased flexibility and customization options
during the initial setup process, eliminating the need to rely on environment variables (which
cannot be set if using platforms like snaps). Existing Emby users, who use the environment variable,
should log out and log back in after updating to set their mediaServerType to Emby.
BREAKING CHANGE: This commit deprecates the JELLYFIN_TYPE variable to identify Emby media server and
instead rely on the mediaServerType that is set in the `settings.json`. Existing environment
variable users can log out and log back in to set the mediaServerType to `3` (Emby).
