Player: Replace HLS with direct FileResponse streaming. Token passed as
query param (?token=JWT) so browser <audio> can authenticate. Multi-track
support: seeks and track transitions handled in AudioPlayer with refs.
Removes hls.js dependency from playback path.
Admin: Add DNB to match sources list. Replace toggle buttons with ordered
drag-to-reorder list (HTML5 drag API) + separate add/remove buttons so
source priority is explicit and adjustable.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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