Add shuffle stream as second pipeline
stream-harmony.lisp:
- scan-music-library-files: recursive directory scanner for supported formats
- Cached shuffle library pool (2797 tracks, 1hr TTL refresh)
- shuffle-random-batch: picks N random tracks from pool
- refill-shuffle-queue: track-change hook keeps queue topped up
- on-shuffle-track-change: updates recently-played, refills queue
- shuffle-now-playing: now-playing stats for shuffle mounts
- start-shuffle-streaming: creates pipeline sharing curated server,
registers hooks, seeds queue, starts play-list with crossfade
- stop-shuffle-streaming: stops pipeline without stopping shared server
asteroid.lisp:
- Start shuffle pipeline after curated pipeline on startup
- Stop/restart shuffle in stream restart endpoint
- Fix stale cl-streamer:get-listener-count call (needs server arg)
frontend-partials.lisp:
- Route shuffle mounts to shuffle-now-playing
- Fix stale cl-streamer:get-listener-count (use pipeline-listener-count)
listener-stats.lisp:
- Poll shuffle mounts (/shuffle.mp3, /shuffle.aac) for listener stats
parenscript/stream-player.lisp:
- get-stream-config returns /shuffle.* mounts when channel is shuffle
parenscript/front-page.lisp, parenscript/player.lisp:
- Normalize now-playing polling to 15s (was 5s/10s, caused 429s)
Build verified, runtime tested: both pipelines play simultaneously,
channel selector switches streams correctly.
5efa49321e