fix(traefik): set controllerName on GatewayClasses and Traefik providers

GatewayClasses were stuck as Unknown because neither Traefik instance
had controllerName configured, causing both to default to
traefik.io/gateway-controller which matched neither GatewayClass.

Align the GatewayClass controllerName fields with what each Traefik
instance is now explicitly configured to advertise.

apps/base/traefik-system/gatewayclass-external.yaml

@@ -4,4 +4,4 @@ kind: GatewayClass
 metadata:
   name: traefik-external
 spec:
-  controllerName: traefik.io/gateway-controller
+  controllerName: traefik.io/gateway-controller-external

apps/base/traefik-system/gatewayclass-internal.yaml

@@ -4,4 +4,4 @@ kind: GatewayClass
 metadata:
   name: traefik-internal
 spec:
-  controllerName: traefik.io/gateway-controller
+  controllerName: traefik.io/gateway-controller-internal

apps/overlays/au-syd1/traefik-system/values-external.yaml

@@ -28,6 +28,7 @@ providers:
     namespaces: []
     nativeLBByDefault: false
     labelSelector: "traefik.io/instance=external"
+    controllerName: "traefik.io/gateway-controller-external"
 
 logs:
   access:

apps/overlays/au-syd1/traefik-system/values-internal.yaml

@@ -28,6 +28,7 @@ providers:
     namespaces: []
     nativeLBByDefault: false
     labelSelector: "traefik.io/instance=internal"
+    controllerName: "traefik.io/gateway-controller-internal"
 
 logs:
   access: