Switch from Ingress to HTTPRoute for Gateway API compatibility.
Changes:
- Remove k8s/ingress.yaml
- Add k8s/httproute.yaml with Gateway API configuration
- Update kustomization.yaml to reference httproute.yaml
- Update README.md references from Ingress to HTTPRoute
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via [Happy](https://happy.engineering)
Co-Authored-By: Claude <noreply@anthropic.com>
Co-Authored-By: Happy <yesreply@happy.engineering>
