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>

infrastructure/nginx/postgres.el-kadi.nl.conf

@@ -0,0 +1,14 @@
+# NOT IN USE — Gebruik Nginx Proxy Manager (NPM) op 192.168.1.173:81
+#
+# Deze nginx config is een referentie voor de proxy regels.
+# De daadwerkelijke reverse proxy staat in NPM (LXC container op Proxmox).
+#
+# NPM proxy host (al geconfigureerd via API):
+#   Domein:           postgres.el-kadi.nl
+#   Forward naar:     http://192.168.1.211:5434
+#   SSL:              Let's Encrypt (cert pas mogelijk na DNS record)
+#
+# DNS: postgres.el-kadi.nl  A  62.166.181.56
+# Port forward op UniFi: 80/443 → 192.168.1.173
+#
+# Toegang direct (LAN): http://192.168.1.211:5434