Reorganize repo: one folder per application under apps/.

Move docker/ and configs/ into apps/<name>/ with config/ subfolders.
Proxmox split into hosts/pve and hosts/dell-proxmox. Nginx under
infrastructure/. Update sync script, RESTORE.md, and per-app READMEs.

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

apps/monitoring/README.md

@@ -0,0 +1,16 @@
+# Monitoring (Prometheus + Grafana + postgres-exporter)
+
+Prometheus-config staat in deze map. **Grafana-image** en dashboards bouw je vanuit [homelab-command](http://192.168.1.211:3000/mo/homelab-command):
+
+```bash
+cd /volume1/homes/mo/homelab-command
+export PG_PASSWORD='...'
+export GRAFANA_ADMIN_PASSWORD='...'
+docker build -f Dockerfile.grafana -t grafana-homelab:latest .
+docker compose -f docker-compose.grafana.yml up -d
+# of: sh scripts/recreate_monitoring_docker.sh
+```
+
+Na start: `docker network create homelab-monitor` en verbind postgres-homelab, neo4j, prometheus, exporter, grafana.
+
+Mesh (NATS + normalizer): `docker compose -f docker-compose.mesh.yml --env-file .env up -d` in homelab-command.