feat: Move cluster services to wild-directory as unified packages

Convert all 15 cluster services from embedded API format to
wild-directory packages using the unified manifest format:
- metallb, traefik, cert-manager, longhorn, snapshot-controller
- nfs, smtp, coredns, node-feature-discovery, nvidia-device-plugin
- externaldns, docker-registry, headlamp, crowdsec, utils

Changes:
- wild-manifest.yaml → manifest.yaml with is, defaultConfig, requires
- Eliminated configReferences and serviceConfig fields
- Flattened kustomize.template/ to package root
- Template vars use flat defaultConfig keys
- install.sh paths updated for apps/ layout
- Updated 9 app manifests: cloud.smtp.* → apps.smtp.* with requires
- Removed dead install: true field from 6 app manifests

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

externaldns/externaldns-cloudflare.yaml

@@ -0,0 +1,38 @@
+---
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: external-dns
+  namespace: externaldns
+spec:
+  selector:
+    matchLabels:
+      app: external-dns
+  strategy:
+    type: Recreate
+  template:
+    metadata:
+      labels:
+        app: external-dns
+    spec:
+      serviceAccountName: external-dns
+      containers:
+        - name: external-dns
+          image: registry.k8s.io/external-dns/external-dns:v0.13.4
+          args:
+            - --source=service
+            - --source=ingress
+            - --txt-owner-id={{ .ownerId }}
+            - --provider=cloudflare
+            - --domain-filter=payne.io
+            #- --exclude-domains=internal.${DOMAIN}
+            - --cloudflare-dns-records-per-page=5000
+            - --publish-internal-services
+            - --no-cloudflare-proxied
+            - --log-level=debug
+          env:
+            - name: CF_API_TOKEN
+              valueFrom:
+                secretKeyRef:
+                  name: cloudflare-api-token
+                  key: api-token