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/install.sh

@@ -0,0 +1,17 @@
+#!/usr/bin/env bash
+# Install the optional host-side Spotify poller as a systemd user timer (run as stan on the
+# server). Copies the units; enables the timer only with --enable (needs
+# ~/.config/music-collector.env, see README.md). Normally not needed: the app polls itself.
+set -euo pipefail
+here="$(cd "$(dirname "$0")" && pwd)"
+install -D -m 644 "$here/music-collector.service" "$HOME/.config/systemd/user/music-collector.service"
+install -D -m 644 "$here/music-collector.timer" "$HOME/.config/systemd/user/music-collector.timer"
+systemctl --user daemon-reload
+if [ "${1:-}" = --enable ]; then
+  test -f "$HOME/.config/music-collector.env" || { echo 'Missing ~/.config/music-collector.env' >&2; exit 1; }
+  systemctl --user enable --now music-collector.timer
+  systemctl --user start music-collector.service || true
+  systemctl --user --no-pager status music-collector.service | head -5
+else
+  echo 'Installed (not enabled). Enable with: bash deploy/music-collector/install.sh --enable'
+fi