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mckero
699561794a
POST /api/power/{on,off,reset,pause,resume}, and every route now tolerates there
being no emulator: /api/status reports powered:false, /frame.png returns 503,
keypresses return 409 with "press On first". Previously create_app required a live
client and the whole page would 500.
The client is fetched through the supervisor per request rather than captured once,
because a power cycle replaces it and the captured one goes stale.
After any power action the pump is rebound, so Off actually goes dark instead of
freezing on the last frame.
Off is refused with 409 for an adopted emulator: we did not start that process.
Reset is allowed either way, since system_reset ends nothing.
Verified over HTTP with a real supervisor and real QEMU:
start powered=False qemu=0 frame=503
key 409 as expected
On powered=True qemu=1 frame=2920 bytes
Reset qemu=1 (process survived)
Off powered=False qemu=0 frame=503
On again powered=True qemu=1 frame=2920 bytes
The web server stayed up throughout, which is the requested behaviour.