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
+[]

apps/monitoring/prometheus/targets/extra.yml.example

@@ -0,0 +1,7 @@
+# Hernoem naar extra.yml of merge handmatig. Formaat: lijst van static config groepen.
+#
+# Proxmox VE exporter (github.com/prometheus-pve/prometheus-pve-exporter):
+- targets:
+    - "192.168.1.50:9221"
+  labels:
+    instance: proxmox

apps/monitoring/prometheus/targets/snmp.yml

@@ -0,0 +1,2 @@
+# SNMP exporter targets (Synology via snmp_exporter). Leeg = geen scrapes.
+[]

apps/monitoring/prometheus/targets/snmp.yml.example

@@ -0,0 +1,5 @@
+# snmp_exporter (poort 9116) die naar je Synology SNMP wijst.
+- targets:
+    - "snmp-exporter:9116"
+  labels:
+    job: synology