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>

snapshot-controller/install.sh

@@ -0,0 +1,66 @@
+#!/bin/bash
+set -e
+set -o pipefail
+
+# Ensure WILD_INSTANCE is set
+if [ -z "${WILD_INSTANCE}" ]; then
+    echo "❌ ERROR: WILD_INSTANCE is not set"
+    exit 1
+fi
+
+# Ensure WILD_API_DATA_DIR is set
+if [ -z "${WILD_API_DATA_DIR}" ]; then
+    echo "❌ ERROR: WILD_API_DATA_DIR is not set"
+    exit 1
+fi
+
+# Ensure KUBECONFIG is set
+if [ -z "${KUBECONFIG}" ]; then
+    echo "❌ ERROR: KUBECONFIG is not set"
+    exit 1
+fi
+
+INSTANCE_DIR="${WILD_API_DATA_DIR}/instances/${WILD_INSTANCE}"
+SNAPSHOT_CONTROLLER_DIR="${INSTANCE_DIR}/apps/snapshot-controller"
+
+echo "🔧 === Setting up Snapshot Controller ==="
+echo ""
+
+# Templates should already be compiled
+echo "📦 Using pre-compiled snapshot-controller templates..."
+if [ ! -f "${SNAPSHOT_CONTROLLER_DIR}/kustomization.yaml" ]; then
+    echo "❌ ERROR: Compiled templates not found at ${SNAPSHOT_CONTROLLER_DIR}/kustomization.yaml"
+    echo "Templates should be compiled before deployment."
+    exit 1
+fi
+
+echo "🚀 Deploying Snapshot Controller..."
+kubectl apply -k ${SNAPSHOT_CONTROLLER_DIR}/
+
+echo "⏳ Waiting for snapshot-controller to be ready..."
+kubectl wait --for=condition=available --timeout=300s deployment/snapshot-controller -n kube-system || true
+
+# Check if VolumeSnapshot CRDs are installed
+echo "✔️ Checking VolumeSnapshot CRDs..."
+kubectl api-resources | grep -q "snapshot.storage.k8s.io" && echo "✅ VolumeSnapshot CRDs found" || echo "⚠️ VolumeSnapshot CRDs not found"
+
+echo ""
+echo "✅ Snapshot Controller installed successfully"
+echo ""
+echo "💡 To verify the installation:"
+echo "  kubectl get pods -n kube-system | grep snapshot-controller"
+echo "  kubectl get crd | grep snapshot"
+echo ""
+echo "📘 To create a snapshot:"
+echo "  kubectl apply -f - <<EOF"
+echo "  apiVersion: snapshot.storage.k8s.io/v1"
+echo "  kind: VolumeSnapshot"
+echo "  metadata:"
+echo "    name: test-snapshot"
+echo "    namespace: default"
+echo "  spec:"
+echo "    volumeSnapshotClassName: longhorn-snapshot-class"
+echo "    source:"
+echo "      persistentVolumeClaimName: your-pvc"
+echo "  EOF"
+echo ""