feat(cattle-system): migrate rancher Ingress to Gateway API (#132)

## 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 cattle-system app cleanly
- [ ] cert-manager issues the `rancher-tls` certificate
- [ ] external-dns creates the DNS record
- [ ] `https://rancher.k8s.syd1.au.unkin.net` is reachable

Reviewed-on: #132

apps/base/cattle-system/gateway.yaml

@@ -0,0 +1,29 @@
+---
+apiVersion: gateway.networking.k8s.io/v1
+kind: Gateway
+metadata:
+  labels:
+    traefik.io/instance: internal
+  annotations:
+    cert-manager.io/cluster-issuer: vault-issuer
+    cert-manager.io/common-name: rancher.k8s.syd1.au.unkin.net
+    cert-manager.io/private-key-size: "4096"
+    external-dns.alpha.kubernetes.io/hostname: rancher.k8s.syd1.au.unkin.net
+    external-dns.alpha.kubernetes.io/target: "198.18.200.4"
+  name: rancher
+  namespace: cattle-system
+spec:
+  gatewayClassName: traefik-internal
+  listeners:
+    - allowedRoutes:
+        namespaces:
+          from: Same
+      hostname: rancher.k8s.syd1.au.unkin.net
+      name: https
+      port: 443
+      protocol: HTTPS
+      tls:
+        certificateRefs:
+          - kind: Secret
+            name: rancher-tls
+        mode: Terminate

apps/base/cattle-system/httproute.yaml

@@ -0,0 +1,20 @@
+---
+apiVersion: gateway.networking.k8s.io/v1
+kind: HTTPRoute
+metadata:
+  name: rancher
+  namespace: cattle-system
+spec:
+  hostnames:
+    - rancher.k8s.syd1.au.unkin.net
+  parentRefs:
+    - name: rancher
+      sectionName: https
+  rules:
+    - backendRefs:
+        - name: rancher
+          port: 80
+      matches:
+        - path:
+            type: PathPrefix
+            value: /

apps/base/cattle-system/ingress.yaml

@@ -1,29 +0,0 @@
----
-apiVersion: networking.k8s.io/v1
-kind: Ingress
-metadata:
-  name: rancher
-  namespace: cattle-system
-  annotations:
-    cert-manager.io/cluster-issuer: vault-issuer
-    cert-manager.io/common-name: rancher.k8s.syd1.au.unkin.net
-    cert-manager.io/private-key-size: "4096"
-    external-dns.alpha.kubernetes.io/hostname: rancher.k8s.syd1.au.unkin.net
-    external-dns.alpha.kubernetes.io/target: "198.18.200.0"
-spec:
-  ingressClassName: nginx
-  tls:
-    - hosts:
-        - rancher.k8s.syd1.au.unkin.net
-      secretName: rancher-tls
-  rules:
-    - host: rancher.k8s.syd1.au.unkin.net
-      http:
-        paths:
-          - path: /
-            pathType: Prefix
-            backend:
-              service:
-                name: rancher
-                port:
-                  number: 80

apps/base/cattle-system/kustomization.yaml

@@ -6,4 +6,5 @@ resources:
   - namespace.yaml
   - vaultauth.yaml
   - vaultstaticsecret.yaml
-  - ingress.yaml
+  - gateway.yaml
+  - httproute.yaml