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/proxmox/README.md

@@ -0,0 +1,41 @@
+# Proxmox VE
+
+Back-ups van `/etc/pve` per host. Na herstel op nieuwe node: bestanden terugzetten en `pct`/`qm` configuratie controleren.
+
+## Hosts
+
+### `hosts/pve` — 192.168.1.216
+
+- PVE 9.x, RTX 3090
+- VMs: `qemu-server/101.conf`, `111.conf`
+- LXCs: 100–119 (zie `lxc/`)
+
+### `hosts/dell-proxmox` — 192.168.1.56
+
+- PVE 8.x, Dell server
+- VMs: `qemu-server/101`–`105`
+- LXCs: 100, 106–119
+
+## Bestanden per host
+
+| Bestand | Doel |
+|---------|------|
+| `datacenter.cfg` | Cluster/datacenter instellingen |
+| `storage.cfg` | Storage pools |
+| `interfaces` | Netwerk bridges |
+| `hosts` | `/etc/hosts` |
+| `hostname` | Node naam |
+| `lxc/*.conf` | LXC containers |
+| `qemu-server/*.conf` | VMs |
+
+## Backup ophalen (vanaf NAS)
+
+```bash
+# pve
+scp -r root@192.168.1.216:/etc/pve/* apps/proxmox/hosts/pve/
+
+# dell
+scp -r root@192.168.1.56:/etc/pve/* apps/proxmox/hosts/dell-proxmox/
+```
+
+Daarna: `sh scripts/sync-from-nas.sh` niet nodig voor proxmox — handmatig of via bovenstaande scp.