Check
Aggregated check: current vs latest, sidecar reachability, pulled status.
Safe to call from any same-origin client; respects the origin guard.
Response Body
application/json
curl -X GET "https://example.com/admin/upgrade/check"{
"current_version": "string",
"latest_version": "string",
"update_available": true,
"pulled": false,
"is_docker_deploy": true,
"auto_update_available": true,
"auto_update_reason": "string",
"registry_error": "string",
"last_checked_at": 0
}