Add port 80 HTTP listener and redirect HTTPRoute to artifactapi,
cattle-system (rancher), litellm, paperclip, and puppetboard — restoring
the redirect behaviour that existed on the previous nginx/traefik Ingress
resources.
Reviewed-on: #145
## Summary
- Replace `Ingress` (nginx) with `Gateway` + `HTTPRoute` using `traefik-internal` GatewayClass
- TLS terminated at the Gateway listener; cert-manager provisions the certificate via `vault-issuer`
- external-dns annotations moved to the Gateway
## Test plan
- [ ] ArgoCD syncs the paperclip app cleanly
- [ ] cert-manager issues the `paperclip-tls` certificate
- [ ] external-dns creates the DNS record
- [ ] `https://paperclip.k8s.syd1.au.unkin.net` is reachable
Reviewed-on: #133
unkinben