* fix: use fs/promises for settings
This PR switches from synchronous operations with the 'fs' module to asynchronous operations with
the 'fs/promises' module. It also corrects a small error with hostname migration.
* fix: add missing merge function of default and current config
* refactor: add more logs to migration
* feat(jellyfinapi): create Jellyfin API key from admin user
* fix(jellyfinapi): add migration script for Jellyfin API key
* feat(jellyfinapi): use Jellyfin API key instead of admin auth token
* fix(jellyfinapi): fix api key migration
* feat(jellyfinapi): add API key field to Jellyfin settings
* fix: move the API key field in the Jellyfin settings
