Add Gateway API HTTPRoute support to Helm chart

What would you like to be added?

Gateway API HTTPRoute support as an alternative to traditional Ingress for exposing Kubernetes Dashboard.

Why is this needed?

• Gateway API reached GA status (v1.0+, October 2023)
• Provides vendor-neutral, portable ingress configuration
• More flexible routing capabilities compared to Ingress
• Wide adoption by major Gateway controllers (Cilium, Istio, Traefik, Envoy Gateway, Kong Gateway API)
• Modern, role-oriented API design

Gateway API documentation: https://gateway-api.sigs.k8s.io/

Implementation approach

Add HTTPRoute template similar to existing Ingress template:

• Uses Kong proxy service as backend (matching current architecture)
• Configurable via values.yaml
• Compatible with existing Ingress setup (one or the other, not both)
• Support for custom parentRefs, hostnames, and routing rules