feat(infra,kura): Expose Kura gRPC ingress in Helm chart

Adds optional gRPC ingress support to the Kura Helm chart so REAPI clients can reach the service’s gRPC port externally while HTTP ingress keeps its own controller annotations.

How to test locally

• helm lint ops/helm/kura
• helm template kura ops/helm/kura --namespace kura
• helm template kura ops/helm/kura --namespace kura --set grpcIngress.enabled=true --set grpcIngress.className=nginx --set 'grpcIngress.annotations.nginx\\.ingress\\.kubernetes\\.io/backend-protocol=GRPC'

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