merge: internal services stop advertising themselves in public DNS

Six exposure:internal services published A records into the public Cloudflare
zone answering 192.168.2.20, disclosing the internal subnet, the Gateway VIP
and a full service inventory, and forming a DNS-rebind primitive that is why
the SOHO router strips these answers in the first place.

The renderer now stamps external-dns.alpha.kubernetes.io/controller: none on
every HTTPRoute it renders for an internal service, derived from the exposure
field alone — so a service that omits exposure defaults to internal and is
likewise unpublishable. Established against the deployed v0.21.0's own source,
where the controller check runs before hostname resolution in both configured
sources, then proven live on a throwaway hostname including that adding the
annotation to an existing record triggers the DELETE.

Deletes exactly 12 records: the A and TXT pair for jackett, pihole,
qbittorrent, radarr, semaphore and sonarr. A 39-record recovery baseline is
committed alongside.

Safe to land before the DHCP change, contrary to my earlier caution: the
router returns NOTHING for all six names today, so these records serve nobody
on the LAN, while Pi-hole at 192.168.2.23 already answers for anyone pointed
at it.

The five exposure:public services are untouched. They remain unreachable
publicly, which is a separate problem: the legacy edge at 136.51.115.252
returns HTTP 403 for our hostnames and serves a placeholder certificate, so
nothing is reverse-proxying them today.

apps/wave-0/jackett.yaml

@@ -268,6 +268,7 @@ metadata:
   annotations:
     homelab.keithjackson.dev/auth-mode: forward-auth
     homelab.keithjackson.dev/auth-groups: media-users,platform-admins
+    external-dns.alpha.kubernetes.io/controller: none
 spec:
   parentRefs:
   - name: shared

apps/wave-0/pihole.yaml

@@ -232,6 +232,7 @@ metadata:
   annotations:
     homelab.keithjackson.dev/auth-mode: forward-auth
     homelab.keithjackson.dev/auth-groups: platform-admins
+    external-dns.alpha.kubernetes.io/controller: none
 spec:
   parentRefs:
   - name: shared

apps/wave-0/qbittorrent.yaml

@@ -344,6 +344,7 @@ metadata:
   annotations:
     homelab.keithjackson.dev/auth-mode: forward-auth
     homelab.keithjackson.dev/auth-groups: media-users,platform-admins
+    external-dns.alpha.kubernetes.io/controller: none
 spec:
   parentRefs:
   - name: shared

apps/wave-1/radarr.yaml

@@ -348,6 +348,7 @@ metadata:
   annotations:
     homelab.keithjackson.dev/auth-mode: forward-auth
     homelab.keithjackson.dev/auth-groups: media-users,platform-admins
+    external-dns.alpha.kubernetes.io/controller: none
 spec:
   parentRefs:
   - name: shared

apps/wave-1/semaphore.yaml

@@ -227,6 +227,7 @@ metadata:
   annotations:
     homelab.keithjackson.dev/auth-mode: oidc
     homelab.keithjackson.dev/auth-groups: platform-admins
+    external-dns.alpha.kubernetes.io/controller: none
 spec:
   parentRefs:
   - name: shared

apps/wave-1/sonarr.yaml

@@ -348,6 +348,7 @@ metadata:
   annotations:
     homelab.keithjackson.dev/auth-mode: forward-auth
     homelab.keithjackson.dev/auth-groups: media-users,platform-admins
+    external-dns.alpha.kubernetes.io/controller: none
 spec:
   parentRefs:
   - name: shared