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fix: expose metrics containerPort to support K8s 1.33 endpoint registration

Kubernetes 1.33 introduced stricter endpoint publishing behavior that requires container ports to be explicitly declared in the pod spec for services to register endpoints.

This patch updates `manager_metrics_patch.yaml` to:
- add `--metrics-bind-address=:8443` to container args
- declare `containerPort: 8443` explicitly

Without the port declaration, the metrics service has no endpoints and connections (e.g., from a curl pod) fail with `connection refused`.

This ensures metrics access continues to work under network policies in K8s 1.33+.