Add gateway-httproute source to external-dns

Allows external-dns to create DNS records from Gateway API HTTPRoute
resources, needed for services using the Envoy edge gateway.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

infrastructure/external-dns/values.yaml

@@ -34,9 +34,8 @@ extraArgs:
   # The UniFi webhook listens on localhost:8888 inside the pod. Use IPv4
   # explicitly to avoid external-dns attempting ::1.
   - --webhook-provider-url=http://127.0.0.1:8888
-# We are switching ingress to Istio; manage records from the Istio ingress Service.
 policy: upsert-only
-sources: ["service"]
+sources: ["service", "gateway-httproute"]
 
 # UniFi DNS doesn't support TXT records; use noop registry.
 registry: noop
@@ -59,7 +58,6 @@ resources:
 serviceAccount:
   create: true
   name: "external-dns"
-# No Ingress watching (Istio VirtualServices are used).
 
 # Enable Prometheus metrics
 serviceMonitor: