feat(cuttlefish): auto-recover from stale HO state on power.on()

[bennyz]

Adds an auto_reset config option that calls reset_host() and retries power.on() once when Host Orchestrator state looks stale (orphaned CVDs that won't delete, or creation failing with "in use"/"already running"). Off by default since HO's /reset is host-wide and stops every CVD on the host.

ADB port-mismatch is deliberately left
out of auto-reset scope since the occupied slot may belong to a different tenant's legitimate CVD.

Also documents that cvd reset must run as the httpcvd user, not root, since HO launches CVDs as httpcvd and cvd's instance database is per-user.

[coderabbitai]

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