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>

node-feature-discovery/install.sh

@@ -0,0 +1,51 @@
+#!/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/${WILD_INSTANCE}"
+NFD_DIR="${INSTANCE_DIR}/apps/node-feature-discovery"
+
+echo "🔧 === Setting up Node Feature Discovery ==="
+echo ""
+
+# Templates should already be compiled
+echo "📦 Using pre-compiled Node Feature Discovery templates..."
+if [ ! -f "${NFD_DIR}/kustomization.yaml" ]; then
+    echo "❌ ERROR: Compiled templates not found at ${NFD_DIR}/kustomization.yaml"
+    echo "Templates should be compiled before deployment."
+    exit 1
+fi
+
+echo "🚀 Deploying Node Feature Discovery..."
+kubectl apply -k "${NFD_DIR}/"
+
+echo "⏳ Waiting for Node Feature Discovery DaemonSet to be ready..."
+kubectl rollout status daemonset/node-feature-discovery-worker -n node-feature-discovery --timeout=300s
+
+echo ""
+echo "✅ Node Feature Discovery installed successfully"
+echo ""
+echo "💡 To verify the installation:"
+echo "  kubectl get pods -n node-feature-discovery"
+echo "  kubectl get nodes --show-labels | grep feature.node.kubernetes.io"
+echo ""
+echo "🎮 GPU nodes should now be labeled with GPU device information:"
+echo "  kubectl get nodes --show-labels | grep pci-10de"