* refactor(jellyfin-scanner): extend BaseScanner for jellyfin scanner
Refactors JellyfinScanner to extend BaseScanner class to align the jellyfin scanner architecture
with the plex scanner and reduce code duplication.
* fix(jellyfin-scanner): add imdbId handling back to fix a regression from original behaviour
* fix: add imdbId assignment for existing media entries
* fix: include imdbId in processed 4k media items and improve 4k detection
* fix(jellyfin-scanner): filter seasons based on settings for special episodes (regression)