fix: migrations, auth, providers health check, E2E tests, remove neko-sama

- Add proper Alembic initial migration (0001_initial_schema.py)
- Migrate refresh tokens from JSON file to SQLite (RefreshTokenTable)
- Remove Neko-Sama provider entirely (redirects to Gupy, not a host)
- Fix provider health check always showing UNKNOWN
  - Run check_all_health() on startup
  - Fix POST /providers/health/check background task bug
  - Add HTMX refresh after manual health check trigger
- Fix anime search relevance scoring with MIN_RELEVANCE_THRESHOLD=0.5
- Replace bare 'except:' with 'except Exception:' across codebase
- Add Playwright E2E test suite (12 tests, auth setup, helpers)
- Fix toast container blocking clicks via pointer-events: none
- Remove obsolete Jest/Vite test files and config
- Clean up obsolete test_watchlist scripts
- Update sonarr model comment for active providers

app/database.py

@@ -18,7 +18,7 @@ engine = create_engine(DATABASE_URL, connect_args={"check_same_thread": False})
 def create_db_and_tables():
     """Create the database and tables based on the models"""
     # CRITICAL: Import ALL models here to ensure they are registered with SQLModel.metadata
-    from app.models.auth import UserTable
+    from app.models.auth import UserTable, RefreshTokenTable
     from app.models.watchlist import WatchlistItemTable, WatchlistSettingsTable
     from app.models.favorites import FavoriteTable
     from app.models.sonarr import SonarrMappingTable, SonarrConfigTable