refactor: remove fields from podcast and episode entities to be replaced with plugins

...ons/2024-12-10-170000_drop_deprecated_podcasts_fields.php

...ons/2024-12-10-180000_drop_deprecated_episodes_fields.php

app/Entities/Episode.php

app/Entities/Podcast.php

app/Helpers/rss_helper.php

app/Helpers/seo_helper.php

app/Libraries/RssFeed.php

app/Models/EpisodeModel.php

app/Models/PodcastModel.php

app/Resources/js/modules/xml-editor.ts

app/Views/Components/Alert.php

app/Views/Components/Charts/ChartsComponent.php

app/Views/Components/Forms/Checkbox.php

app/Views/Components/Forms/Field.php

app/Views/Components/Forms/RadioButton.php

app/Views/Components/Forms/Toggler.php

app/Views/Components/Forms/XMLEditor.php

app/Views/Components/IconButton.php

app/Views/Components/Pill.php

modules/Admin/Config/Routes.php