dangernoodle-io / breadboard / 24908131202

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feat(bb_http): /api/ping liveness endpoint with uptime (B1-64) (#80)

cheap text endpoint for client-side liveness probes. returns
"ok <uptime_s>" on port 80, content-type text/plain. no locks,
no heap alloc, no nvs — safe to call during any firmware state
including ota finalize. the uptime token lets a reboot-recovery
probe distinguish "device came back from a real reboot" (uptime
small) from "tcp connection bounced" (uptime large) with one
roundtrip.

arduino/host backends return uptime=0 for now; a real consumer
can swap in millis()/1000 or similar later.

consumers: taipanminer will swap webui ping() from /api/version
to /api/ping in a follow-up.

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