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>

longhorn/README.md

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+# Longhorn Storage
+
+See: [Longhorn Docs v 1.8.1](https://longhorn.io/docs/1.8.1/deploy/install/install-with-kubectl/)
+
+## Installation Notes
+
+- Manifest copied from https://raw.githubusercontent.com/longhorn/longhorn/v1.8.1/deploy/longhorn.yaml
+- Using kustomize to apply custom configuration (see `kustomization.yaml`)
+
+## Important Settings
+
+- **Number of Replicas**: Set to 1 (default is 3) to accommodate smaller clusters
+  - This avoids "degraded" volumes when fewer than 3 nodes are available
+  - For production with 3+ nodes, consider changing back to 3 for better availability
+
+## Common Operations
+
+- View volumes: `kubectl get volumes.longhorn.io -n longhorn-system`
+- Check volume status: `kubectl describe volumes.longhorn.io <volume-name> -n longhorn-system`
+- Access Longhorn UI: Set up port-forwarding with `kubectl -n longhorn-system port-forward service/longhorn-frontend 8080:80`

longhorn/ingress.yaml

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+apiVersion: networking.k8s.io/v1
+kind: Ingress
+metadata:
+  name: longhorn-ingress
+  namespace: longhorn-system
+spec:
+  rules:
+    - host: "longhorn.{{ .internalDomain }}"
+      http:
+        paths:
+          - path: /
+            pathType: Prefix
+            backend:
+              service:
+                name: longhorn-frontend
+                port:
+                  number: 80
+  tls:
+    - secretName: wildcard-internal-wild-cloud-tls
+      hosts:
+        - "longhorn.{{ .internalDomain }}"

longhorn/install.sh

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+#!/bin/bash
+set -e
+set -o pipefail
+
+if [ -z "${WILD_INSTANCE}" ]; then
+    echo "ERROR: WILD_INSTANCE is not set"
+    exit 1
+fi
+
+if [ -z "${WILD_API_DATA_DIR}" ]; then
+    echo "ERROR: WILD_API_DATA_DIR is not set"
+    exit 1
+fi
+
+if [ -z "${KUBECONFIG}" ]; then
+    echo "ERROR: KUBECONFIG is not set"
+    exit 1
+fi
+
+INSTANCE_DIR="${WILD_API_DATA_DIR}/instances/${WILD_INSTANCE}"
+LONGHORN_DIR="${INSTANCE_DIR}/apps/longhorn"
+
+echo "=== Setting up Longhorn ==="
+echo ""
+
+echo "Using pre-compiled Longhorn templates..."
+if [ ! -f "${LONGHORN_DIR}/kustomization.yaml" ]; then
+    echo "ERROR: Compiled templates not found at ${LONGHORN_DIR}"
+    echo "Templates should be compiled before deployment."
+    exit 1
+fi
+
+echo "Deploying Longhorn..."
+kubectl apply -k ${LONGHORN_DIR}/
+
+echo "Waiting for Longhorn to be ready..."
+kubectl wait --for=condition=available --timeout=300s deployment/longhorn-driver-deployer -n longhorn-system || true
+
+echo ""
+echo "Longhorn installed successfully"
+echo ""
+echo "To verify the installation:"
+echo "  kubectl get pods -n longhorn-system"
+echo "  kubectl get storageclass"
+echo ""
+echo "To access the Longhorn UI:"
+echo "  kubectl port-forward -n longhorn-system svc/longhorn-frontend 8080:80"

longhorn/kustomization.yaml

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+apiVersion: kustomize.config.k8s.io/v1beta1
+kind: Kustomization
+
+resources:
+  - longhorn.yaml
+  - ingress.yaml
+  - volumesnapshotclass-longhorn.yaml

longhorn/manifest.yaml

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+name: longhorn
+is: longhorn
+description: Cloud-native distributed block storage for Kubernetes
+version: v1.8.1
+namespace: longhorn-system
+deploymentName: longhorn-ui
+category: infrastructure
+requires:
+  - name: traefik
+  - name: nfs
+defaultConfig:
+  internalDomain: "{{ .cloud.internalDomain }}"
+  backupTarget: "nfs://{{ .apps.nfs.host }}:/data/{{ .cluster.name }}/backups"

longhorn/volumesnapshotclass-longhorn.yaml

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+apiVersion: snapshot.storage.k8s.io/v1
+kind: VolumeSnapshotClass
+metadata:
+  name: longhorn-snapshot-class
+driver: driver.longhorn.io
+deletionPolicy: Delete
+parameters:
+  type: snap