Empirically (staging on 9201): traefik v3 issues a cert from a router-level
tls.domains but NOT from the entrypoint http.tls.domains. So the wildcard moves
to RenderControllerRoute (the always-present anchor): when DNS-01 ACME is
configured it carries tls.certResolver+domains *.<domain>+apex, and every other
router serves that wildcard by SNI (no per-app labels). Reverts v0.42.0's dead
entrypoint-domains + TraefikData.Domain.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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