Check Executor Health

Endpoint to run health check on a node.

The check creates a temporary GPU container on the executor, so it must never run on a machine a customer is actively using. It is skipped (and passed) when the executor has an active customer rental — signalled by the validator's rental_in_progress flag, confirmed by a fresh DB check, or detected after the fact if a rental landed mid-check. See services/rental_gate.py.