Introduce a global watchlist override feature and UI to control release/content filters across all watchlist artists. Backend: add /api/watchlist/global-config (GET/POST) for reading/updating global settings, validation to require at least one release type when override is enabled, and _apply_watchlist_global_overrides() to apply settings to WatchlistArtist objects. Scanners (manual and automatic) now call _apply_watchlist_global_overrides() and perform additional checks (_should_include_release, _should_include_track) to skip releases/tracks according to config. Frontend: add a Global Watchlist Settings modal, controls (release types, content filters, include-all shortcut), save/validation logic, banners/notices when global override is active, and integration into the watchlist modal and per-artist config. Styles: add supporting CSS for the modal and banners. Small cleanup/whitespace adjustments included.
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