Restrict Linux OS updates to full BetterFrame OS installations

[bcbetterninja]

Linux app-only installations could enter OS OTA when BF_ENABLE_OS_OTA=0 was missing. Require the full BetterFrame image's OS version, compatibility identity, and RAUC configuration before checking or applying OS updates, including forced updates. Recheck eligibility after download and report the same eligibility in heartbeats. App updates continue to restart only the app.

Clear inherited systemd SuccessAction alongside failure/start-limit actions when repairing standalone installations. Existing service configuration requires rerunning the updated installer. The reported device's exact reboot cause has not been confirmed from device logs.

Validation:

• 18 Rust tests passed in a harness compiling the actual app/OS update modules, including public/authenticated/forced rejection on an app-only host and all image-marker combinations.
• 33 installer tests passed; 2 skipped.
• 13 OS lifecycle tests passed.
• Shell syntax and diff checks passed.
• Full GUI build not run locally: GTK/GStreamer/WebKit development packages are unavailable.

[coderabbitai]

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[chatgpt-codex-connector]

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