feat(puppet): migrate puppetboard Ingress to Gateway API

Replace nginx Ingress with Gateway + HTTPRoute using the traefik-internal
GatewayClass. TLS is terminated at the Gateway listener via cert-manager.

apps/base/puppet/gateway_puppetboard.yaml

@@ -0,0 +1,32 @@
+---
+apiVersion: gateway.networking.k8s.io/v1
+kind: Gateway
+metadata:
+  annotations:
+    cert-manager.io/cluster-issuer: vault-issuer
+    cert-manager.io/common-name: puppetboard.k8s.syd1.au.unkin.net
+    cert-manager.io/private-key-size: "4096"
+    external-dns.alpha.kubernetes.io/hostname: puppetboard.k8s.syd1.au.unkin.net
+    external-dns.alpha.kubernetes.io/target: 198.18.200.0
+  labels:
+    app.kubernetes.io/component: puppetboard
+    app.kubernetes.io/instance: puppetserver
+    app.kubernetes.io/name: puppetserver
+    app.kubernetes.io/version: 8.8.0
+  name: puppetboard
+  namespace: puppet
+spec:
+  gatewayClassName: traefik-internal
+  listeners:
+    - allowedRoutes:
+        namespaces:
+          from: Same
+      hostname: puppetboard.k8s.syd1.au.unkin.net
+      name: https
+      port: 443
+      protocol: HTTPS
+      tls:
+        certificateRefs:
+          - kind: Secret
+            name: puppetboard-tls
+        mode: Terminate