[MateoLostanlen]

Part of pyronear/roadmap#16, fixes #445 (API reboot step). Stacked on #458.

• The stuck detector only caught a PTZ whose poses all look alike, every 30 min. It now checks every camera every 5 min for three problems: no new image, new images with the exact same pixels (frozen camera, each pose on its own image as at Epinay), and the existing turret not moving check.
• Two checks in a row reboot the camera through its API, at most 3 attempts per 24 h and 30 min apart. Cameras that cannot reboot are only logged. Power cuts stay with the Shelly watchdog.
• /patrol_status exposes the detected problem and the reboot attempts, for monitoring.
• ALLOW_STILL_CAMERA=true (testing only, warned at startup) ignores frozen and not moving cameras, to work with a still PTZ at home.

[MateoLostanlen]

Tested on pi-test (Pi 5, Debian 13, Docker 29), branch develop + #419 + #459 + #461, images built on the Pi, ALLOW_STILL_CAMERA=true, both real cameras unplugged.

Camera without fresh image, API reboot with budget: OK

• Seen: first check is the baseline (+5 min), Camera no_fresh_image (hit 1/2) at +10 min, hit 2/2 and Rebooting camera, no_fresh_image at +15 min, then Reboot raised: ... Max retries exceeded and Reboot command rejected by camera.
• /patrol/patrol_status shows recovery: {status: no_fresh_image, reboot_attempts_24h: 1, last_reboot_attempt: 2026-10-28T10:42:19Z}.
• With the fake cameras of feat: fake Reolink camera driven by scenarios pyro-envdev#65 (same frame on every visit) the frozen case was ignored as designed by ALLOW_STILL_CAMERA, with the startup warning.

Not tested: frozen and not_moving on a real moving camera, and the 3 per day budget (stopped before the second attempt).

Remarks:

• Reboot raised: logs the Reolink URL with password=... in clear. patrol.py already does it on Error at pose, but this PR adds a new place.
• After a failed attempt hits goes back to 0, so the next hit 2/2 comes at +15 min while the cooldown is 30 min: reboot budget spent will be logged every 5 min for 15 min. Cosmetic.