music: self-hosted scrobbler (Spotify poller, Last.fm + streaming-history importers, /trackers/music, homepage listening card)

- music schema: artists/albums/tracks (+album art), plays with source + dedupe, now_playing,
  spotify_auth, import_state; plays_deduped view hides Last.fm scrobbles Spotify also has
- in-app Spotify poller (60s, leased) started from hooks init; no new role or env needed
- /api/spotify/connect + callback (owner only), /trackers/music public stats
- scripts: music-poll, music-import-lastfm (resumable), music-import-history
- deploy/music-collector: optional host timer with its own role

deploy/music-collector/music-collector.timer

@@ -0,0 +1,10 @@
+[Unit]
+Description=Spotify scrobbler poll every minute (optional; the app polls by itself)
+
+[Timer]
+OnBootSec=45s
+OnUnitActiveSec=60s
+AccuracySec=5s
+
+[Install]
+WantedBy=timers.target