Allow the openclaw pod to reach the Radicale CalDAV/CardDAV server
(namespace: radicale, port 5232) so Kosmos can read/write Valentin's
calendar via the in-cluster service. Mirrors networkpolicy-mail-egress.yaml.
Workaround for spec.networkPolicy.additionalEgress not being in the CRD
bundled with operator chart 0.39.0 yet (silently pruned).
