Disable SSH; serve git.unkin.net + git.k8s.syd1 admin route

Per the forge design: drop git-over-ssh (HTTPS clones only, estate norm) and
serve the new instance on both the canonical git.unkin.net and a
git.k8s.syd1.au.unkin.net admin/backup route (same dual-name pattern as
identity). Only the k8s admin name goes live now (external-dns); the
git.unkin.net DNS flip stays the gated final cutover step.

- values: DISABLE_SSH + START_SSH_SERVER false; DOMAIN/ROOT_URL/SSH_DOMAIN ->
  git.unkin.net; drop the SSH LoadBalancer service
- overlay: $patch-delete the chart's leftover gitea-ssh Service
- gateway/httproute: listeners + routes for git.unkin.net and
  git.k8s.syd1.au.unkin.net; cert CN git.unkin.net (both as SANs); external-dns
  publishes only git.k8s.syd1.au.unkin.net -> 198.18.200.4
- bind-internal: prepared (commented) git-dns-internal DNSRecord as the gated
  apex cutover step
- docs: SSH removed, dual hostnames, git.unkin.net flip as the final step

Claude-Session: https://claude.ai/code/session_015ur3i7D2azsMAWTSVABApv

apps/base/bind-internal/authoritative/records.yaml

@@ -20,6 +20,32 @@ spec:
     # identity.unkin.net hostname there.
     - 198.18.200.4
 ---
+# PRODUCTION CUTOVER RECORD — intentionally commented out.
+# git.unkin.net currently resolves to the LIVE VM forge (HAProxy VRRP VIP
+# 198.18.19.17), which holds every repo the estate depends on. Uncommenting this
+# repoints the whole org's git.unkin.net at the new k8s Gitea gateway VIP, so it
+# is the FINAL step of the forge migration — gated on the data migration (gitea
+# dump/restore + SECRET_KEY copy) in argocd-apps docs/gitea-migration.md.
+# NOTE: the live git.unkin.net answer is served by the puppet DNS master today
+# (profiles::dns::master, records from PuppetDB); this k8s apex zone holds only
+# SOA+NS + a few DNSRecords so far. Confirm the k8s bind cluster is the live
+# authority for unkin.net (or update the puppet record instead) before relying
+# on this CR at cutover.
+# ---
+# apiVersion: bind.unkin.net/v1alpha1
+# kind: DNSRecord
+# metadata:
+#   name: git-dns-internal
+#   namespace: bind-internal
+# spec:
+#   zoneRef: unkin-net
+#   name: git
+#   type: A
+#   ttl: 600
+#   values:
+#     # traefik-internal gateway VIP; the gitea Gateway serves git.unkin.net there.
+#     - 198.18.200.4
+---
 apiVersion: bind.unkin.net/v1alpha1
 kind: DNSRecord
 metadata: