dangernoodle-io / breadboard / 25093345788

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perf(bb_http): raise max_open_sockets default + tighten timeouts (#149)

- max_open_sockets: 7 → 9 (Kconfig override). IDF reserves 3 for
  internal control sockets, so the previous 7 left only 4 client
  slots — insufficient when SSE log streaming + web UI + occasional
  OTA upload run concurrently. lru_purge_enable=true was silently
  dropping the oldest socket (often the SSE stream) under load.
  Default 9 = 6 client slots; range 4-16.
- recv_wait_timeout: 30s → 10s (Kconfig override). OTA push has a
  30-retry loop, giving 300s total stall budget at 10s/retry. SSE
  bypasses httpd timeouts via setsockopt after async handoff. The
  previous 30s let stalled clients hold sockets 6× longer than
  needed, amplifying the max_open_sockets pressure.
- send_wait_timeout: 30s → 10s (Kconfig override). Same rationale.

Three new Kconfig knobs:
- CONFIG_BB_HTTP_MAX_OPEN_SOCKETS (default 9)
- CONFIG_BB_HTTP_RECV_WAIT_TIMEOUT_S (default 10)
- CONFIG_BB_HTTP_SEND_WAIT_TIMEOUT_S (default 10)

Closes B1-119.

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