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fix(bb_sse_writer): add SO_SNDTIMEO to stop SSE socket/session leak (#547)

A stalled or uncleanly-closed SSE client made the writer's send() block forever (only SO_RCVTIMEO was set), leaking the httpd async session + lwIP socket. Two such leaks exhaust the socket pool, wedging the whole network stack (lost IP, HTTP/MQTT/stratum dead) while mining continues -- an outright hang, no reboot; heap-tight boards OOM-panic instead. Add SO_SNDTIMEO via CONFIG_BB_SSE_SEND_TIMEOUT_MS (default 3000ms); also make SO_RCVTIMEO tunable via CONFIG_BB_SSE_RECV_TIMEOUT_MS (default 30000ms). Reproduced + isolated on hardware.

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

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