feat: add Settings tab with provider management and language preferences

- Implemented AppSettings model and table using SQLModel.
- Created Settings router with endpoints for preferences and provider toggling.
- Added Settings tab to the UI with real-time health status of providers.
- Integrated language and provider filtering into anime and series search logic.
- Updated templates to respect user-defined settings.

app/database.py

@@ -22,6 +22,7 @@ def create_db_and_tables():
     from app.models.watchlist import WatchlistItemTable, WatchlistSettingsTable
     from app.models.favorites import FavoriteTable
     from app.models.sonarr import SonarrMappingTable, SonarrConfigTable
+    from app.models.settings import AppSettingsTable
     
     SQLModel.metadata.create_all(engine)