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/hosts/pve/interfaces

@@ -0,0 +1,19 @@
+auto lo
+iface lo inet loopback
+
+iface enp2s0 inet manual
+
+auto vmbr0
+iface vmbr0 inet static
+	address 192.168.1.216/24
+	gateway 192.168.1.1
+	bridge-ports enp2s0
+	bridge-stp off
+	bridge-fd 0
+
+iface enp0s13f0u2u2 inet manual
+
+iface wlp3s0 inet manual
+
+
+source /etc/network/interfaces.d/*