Add scrobbling to Last.fm/ListenBrainz + update What's New
Scrobbling:
- Last.fm: API signing, web auth flow, batch scrobble (50/request)
- ListenBrainz: submit_listens (batch 1000, listen_type=import)
- Worker hook: scrobbles unscrobbled events after each poll
- DB: scrobbled_lastfm/scrobbled_listenbrainz tracking columns
- Settings: API secret input, authorize button, scrobble toggles
- Config: lastfm.api_secret, lastfm.session_key, *.scrobble_enabled
What's New: added all features from this session (scrobbling,
personalized discovery, stats page, SoulID, lossy codecs, import,
hero redesign, Hydrabase, orphan fixes, year collection).
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