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/prometheus/targets/extra.yml

@@ -0,0 +1,9 @@
+# Voeg hier scrape-targets toe (YAML array van scrape_configs entries wordt NIET ondersteund —
+# dit bestand is voor **file_sd** formaat: lijst van static_configs targets).
+#
+# Voorbeeld Proxmox (prometheus-pve-exporter op host of VM):
+# - targets:
+#     - '192.168.1.10:9221'
+#   labels:
+#     instance: pve
+[]