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.service

@@ -0,0 +1,15 @@
+[Unit]
+Description=Spotify scrobbler poll (now playing + recently played -> music.*) for stanrunge.dev/trackers/music
+Wants=network-online.target
+After=network-online.target
+ConditionPathExists=%h/.config/music-collector.env
+
+[Service]
+Type=oneshot
+# A checkout of stan/website on main. Not the live dev tree.
+WorkingDirectory=%h/dev/website-music
+# MUSIC_DB_URL (music_collector role), SPOTIFY_CLIENT_ID, SPOTIFY_CLIENT_SECRET; mode 600.
+EnvironmentFile=%h/.config/music-collector.env
+ExecStart=/usr/bin/bun scripts/music-poll.ts
+TimeoutStartSec=50
+Nice=10