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

src/hooks.server.ts

@@ -1,4 +1,5 @@
-import type { Handle } from '@sveltejs/kit/hooks';
+import type { Handle, ServerInit } from '@sveltejs/kit/hooks';
+import { startMusicPoller } from '#lib/server/music/poller.js';
 import { building } from '$app/env';
 import { auth } from '#lib/server/auth.js';
 import { isOwner, isOwnerOnlyPath, isOwnerWritePath } from '#lib/server/owner.js';
@@ -6,6 +7,11 @@ import { error } from '@sveltejs/kit';
 
 const analytics = /<!-- analytics -->[\s\S]*?<!-- \/analytics -->/;
 
+// Background jobs that live in the app process: the Spotify scrobbler (idle until connected).
+export const init: ServerInit = () => {
+	if (!building) startMusicPoller();
+};
+
 export const handle: Handle = async ({ event, resolve }) => {
 	// Match the endpoint path here: the dev proxy may terminate HTTPS before Vite.
 	// Better Auth validates request origins against its configured public URL.