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feat: acquire a durable MQTT egress consumer for bb_data_http's log stream (#1263)

- floor_mqtt_egress.c/h: pure translation from bb_mqtt_client_enqueue()'s
  return code to bb_data_http_send_fn's two-class retry contract, plus the
  send_fn/abort_fn implementations wired onto a DURABLE bb_data_http client
- floor_app.c: acquires the durable client mirroring the already-attached
  "log" key, after bb_mqtt_client_init_default(), publishing under
  "floor/<key>" -- gated on floor_mqtt_egress_should_acquire() (a pure,
  host-tested predicate) so a board with MQTT disabled in NVS never
  permanently claims a bb_data_http client slot for a client that could
  never deliver anything
- CONFIG_BB_DATA_HTTP_MAX_CLIENTS is deliberately NOT bumped here: raising
  it to 3 trips bb_data_http_espidf.c's own compile-time sweep-budget guard
  (3*20ms >= the 50ms sweep interval) -- confirmed by an actual failed
  build -- so floor is left at 2 slots pending a follow-up that also widens
  that headroom
- host tests exercise the translation matrix, the send_fn/abort_fn seams
  directly (including the oversized-key truncation guard and its exact
  "one byte of slack" boundary), the should_acquire gate, and a real
  bb_data_http_sweep_step() against bb_mqtt_client's host stub for
  outbox-full, no-client, and fatal-reject scenarios


Claude-Session: https://claude.ai/code/session_0119nuE2NZME9y2aYEVJTPB5

Co-authored-by: Claude Opus 5 <noreply@anthropic.com>

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