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>

docker-registry/install.sh

@@ -0,0 +1,48 @@
+#!/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/${WILD_INSTANCE}"
+DOCKER_REGISTRY_DIR="${INSTANCE_DIR}/apps/docker-registry"
+
+echo "=== Setting up Docker Registry ==="
+echo ""
+
+echo "Using pre-compiled Docker Registry templates..."
+if [ ! -f "${DOCKER_REGISTRY_DIR}/kustomization.yaml" ]; then
+    echo "ERROR: Compiled templates not found at ${DOCKER_REGISTRY_DIR}"
+    echo "Templates should be compiled before deployment."
+    exit 1
+fi
+
+echo "Deploying Docker Registry..."
+kubectl apply -k "${DOCKER_REGISTRY_DIR}/"
+
+echo "Waiting for Docker Registry to be ready..."
+kubectl wait --for=condition=available --timeout=300s deployment/docker-registry -n docker-registry
+
+echo ""
+echo "Docker Registry installed successfully"
+echo ""
+echo "Deployment status:"
+kubectl get pods -n docker-registry
+kubectl get services -n docker-registry
+echo ""
+echo "To use the registry:"
+echo "  docker tag myimage registry.local/myimage"
+echo "  docker push registry.local/myimage"