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.

main.py

@@ -126,6 +126,7 @@ from app.routers import (
     player_router,
     static_router,
     root_router,
+    settings_router,
 )
 
 
@@ -140,6 +141,7 @@ app.include_router(watchlist_router)
 app.include_router(sonarr_router)
 app.include_router(player_router)
 app.include_router(static_router)
+app.include_router(settings_router)
 
 
 if __name__ == "__main__":