Add full NAS service catalog for disaster recovery.

Compose files and configs for postgres, adguard, duckdns, homarr, neo4j,
portainer, remotely, and monitoring; RESTORE.md and sync-from-nas script.
Sanitize pgAdmin secrets; document homelab-command as separate repo.

Co-authored-by: Cursor <cursoragent@cursor.com>

docker/duckdns/docker-compose.yml

@@ -0,0 +1,16 @@
+# DuckDNS — dynamisch DNS voor mohome020.duckdns.org
+# Start: cp .env.example .env && docker compose up -d
+
+services:
+  duckdns:
+    image: linuxserver/duckdns:latest
+    container_name: duckdns
+    restart: unless-stopped
+    environment:
+      PUID: ${PUID:-1026}
+      PGID: ${PGID:-100}
+      TZ: ${TZ:-Europe/Brussels}
+      SUBDOMAINS: ${DUCKDNS_SUBDOMAINS:?}
+      TOKEN: ${DUCKDNS_TOKEN:?}
+      UPDATE_IP: ${DUCKDNS_UPDATE_IP:-true}
+      INTERVAL: ${DUCKDNS_INTERVAL:-300}