Replace single-connection relay with per-rig audio manager that spawns independent TCP connections for each rig. Each rig gets its own broadcast channel, stream info, and vchan command routing. Selected rig mirrors to global channels for backward compat. Also fix bookmark apply to update spectrum marker instantly and fire all requests in parallel.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Signed-off-by: Stan Grams <sjg@haxx.space>
sjg
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