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feat(bb_diag): GET /api/diag/sockets — LWIP TCP state distribution (#240)

Returns a JSON snapshot of every active TCP PCB and counts by state.
Built to investigate suspected CLOSE_WAIT / FIN_WAIT_2 pile-up that
appears to exhaust the LWIP socket pool after sustained SSE churn.

Walks tcp_active_pcbs + tcp_tw_pcbs + tcp_bound_pcbs + tcp_listen_pcbs
under LOCK_TCPIP_CORE. Output:
  - lwip_max_sockets (compile-time)
  - in_use (count of all non-CLOSED PCBs)
  - by_state (per-state count)
  - pcbs[] (local_port, remote_ip:port, state per PCB)

No expected effect on normal operation; endpoint is read-only.

Co-authored-by: Claude Opus 4.7 <noreply@anthropic.com>

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