feat(dashboard): SSL card expired/expiring split + HAProxy frontend labels
Expired certs now show a red error alert ("renew immediately") instead
of being silently folded into the orange "expiring soon" warning.
HAProxy frontend technical names (public_http, public_https, mgmt_https)
now display as human-readable labels (HTTP In, HTTPS In, Management).
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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