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fix(bb_mdns): stop single-core browse-notify drops via a task-priority knob (#378)

on single-core boards (C3/S2) the bb_mdns dispatch task (hardcoded priority 3)
is starved by the priority-20 miner on the shared core, so it cannot free the
coalescing batch slot in time and drops bursts of browse-notify events
(notifier: queue+batch full — 673 dropped on the C3 dev unit). knot fleet
discovery lags as a result.

adds BB_MDNS_TASK_PRIORITY (default 3, unchanged for dual-core boards) and
applies it to the dispatch + query tasks, so single-core consumers can raise
the priority via sdkconfig and the dispatcher drains promptly.

Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>

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