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/adguard/docker-compose.yml

@@ -0,0 +1,21 @@
+# AdGuard Home — DNS + filtering (host network, poort 53 + web UI).
+# Config: apps/adguard/config/AdGuardHome.yaml → /volume1/docker/Configs/adguard/
+
+services:
+  adguard:
+    image: adguard/adguardhome:latest
+    container_name: Adguard
+    restart: always
+    network_mode: host
+    volumes:
+      - ${ADGUARD_CONFIG_DIR:-/volume1/docker/Configs/adguard}:/opt/adguardhome/conf
+      - adguard-work:/opt/adguardhome/work
+    command:
+      - --no-check-update
+      - -c
+      - /opt/adguardhome/conf/AdGuardHome.yaml
+      - -w
+      - /opt/adguardhome/work
+
+volumes:
+  adguard-work: