The SLM live view now consumes SLMM's shared DOD /monitor feed instead of
the per-client DRD /stream. This fixes the single-connection contention
(many viewers share one device feed) and finally puts L1/L10 in the live
chart (DRD couldn't carry percentiles).
- New WS proxy handler /api/slmm/{unit}/monitor -> SLMM /api/nl43/{unit}/monitor.
Uses asyncio.wait(FIRST_COMPLETED) + cancel-sibling instead of gather(), so
it doesn't leave a task sending into a closed socket ("Unexpected ASGI
message after close").
- Live view JS points at /monitor; onmessage reflects feed_status and ignores
heartbeat / unreachable frames so they don't blank the cards or zero-spike
the chart. Adds a small Live/Device-offline badge.
Still on the old /live (DRD): the dashboard live tile (sound_level_meters.html)
— next slice.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>