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fix(bb_http): pre-allocate httpd lwip TLS sem to close OOM race (B1-223) (#302)

- add prealloc_tls_sem_cb static work-item callback that calls lwip_socket_thread_init()
- queue the callback via httpd_queue_work immediately after httpd_start succeeds so the
  per-thread netconn sem is allocated at boot when heap is plentiful
- eliminates the lazy-alloc-under-load path that triggers the LWIP_ASSERT in
  tcpip_send_msg_wait_sem (tcpip.c:453) during high-chunk /api/pool responses

Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>

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