Filter disabled libraries from settings and add episode/season/series ID context for sharing migration

[Copilot]

The settings page currently lists libraries even when SkipMe.db is disabled at the Jellyfin library level. This update aligns the UI with Jellyfin’s media-segment provider configuration and starts moving sharing-related identifier plumbing from Segment Editor into the plugin backend.

• Settings page: library visibility now honors provider enablement

  • Added virtual-folder lookup (GET /Library/VirtualFolders) and library option typing.
  • Resolved SkipMe.db provider disablement from LibraryOptions.DisabledMediaSegmentProviders.
  • Filtered dashboard library sections to only include libraries where SkipMe is enabled (checks both provider hash ID and skipme.db name fallback).

• Backend: episode-level provider context groundwork

  • Added provider extraction across episode/season/series scopes in SyncSegmentsTask.
  • Added explicit episode lookup context carrying:
    • tvdb_season_id
    • tvdb_series_id
    • imdb_series_id
    • tmdb_id
    • season / episode numbers
  • Wired this context into episode lookup request construction paths.

• Backend: season/series access to all episode IDs

  • Extended show work-item aggregation to retain:
    • all episode IDs for a series
    • episode ID lists grouped by season ID
  • This provides the data shape needed for sharing behavior previously hosted in Segment Editor.

var lookupContext = GetEpisodeLookupContext(episodeItem, providerIds);
// exposes: TvdbSeasonId, TvdbSeriesId, ImdbSeriesId, TmdbId, SeasonNumber, EpisodeNumber
tvdbId = providerIds.Episode.TvdbId ?? lookupContext.TvdbSeasonId ?? lookupContext.TvdbSeriesId;
imdbId = lookupContext.ImdbSeriesId ?? providerIds.Season.ImdbId ?? providerIds.Episode.ImdbId;