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feat(bb_mqtt,bb_pub): connection suspend/resume + pause quiesce for heap-heavy TLS ops (B1-281) (#430)

- bb_mqtt_suspend_default/resume_default: fully release the auto mqtt client
  (destroy — frees ~11KB of task+buffers+struct) and recreate it from NVS, so a
  heap-tight board (ESP32-S2) can free the connection's heap for a concurrent
  GitHub update-check TLS handshake, then reconnect.
- bb_pub_pause() now quiesces the worker (waits for any in-flight tick under a
  tick lock) so the suspend/destroy can't race an in-flight publish — fixes a
  bb_pub use-after-free panic seen during teardown.
- hardware-validated on ESP32-S2: /api/update/check completes with telemetry
  active, no crash, telemetry reconnects after.

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

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