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/lib/server/db/index.ts

@@ -3,7 +3,8 @@ import { relations } from './relations';
 import { drizzle } from 'drizzle-orm/postgres-js';
 import postgres from 'postgres';
 
-const client = postgres(DB_URL, { prepare: false });
+/** Raw postgres.js client (same pool), for hand-written SQL such as the music stats. */
+export const client = postgres(DB_URL, { prepare: false });
 
 export const db = drizzle({
 	relations,