Initial bind-operator: 9 CRDs + controllers

Implements a Kubernetes operator that manages fleets of BIND9 servers
declaratively, using controller-runtime (matching forgebot conventions).

- add BindCluster reconciler: StatefulSet (pod-0 primary, secondaries),
  headless + client Services, rendered named.conf ConfigMap, TSIG keys
  Secret and rndc control Secret; watches dependent CRs to re-render
- add BindTSIGKey reconciler that generates key material into a Secret
- add BindZone/DNSRecord reconcilers using fully-dynamic delivery
  (rndc addzone + TSIG nsupdate against the primary pod)
- add BindCatalogZone reconciler so secondaries auto-provision zones
- add BindPolicy (RPZ), BindDNSSECPolicy, BindView, BindACL reconcilers
- render primary/secondary named.conf variants selected by pod ordinal
- generate CRDs, deepcopy and RBAC; add samples mapping the three Puppet
  roles (authoritative/resolver/external-dns) to three BindClusters
- add Makefile, Dockerfile.operator, Woodpecker CI and kind manifests

config/samples/04-view.yaml

@@ -0,0 +1,26 @@
+---
+# Split-horizon example: an internal view answering RFC1918 clients and a
+# default external view. Bind a zone to a view via BindZone.spec.viewRef.
+apiVersion: bind.unkin.net/v1alpha1
+kind: BindView
+metadata:
+  name: internal
+  namespace: bind-auth
+spec:
+  clusterRef: auth
+  order: 10
+  matchClients:
+    - internal-nets
+  recursion: false
+---
+apiVersion: bind.unkin.net/v1alpha1
+kind: BindView
+metadata:
+  name: external
+  namespace: bind-auth
+spec:
+  clusterRef: auth
+  order: 100
+  matchClients:
+    - any
+  recursion: false