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/lxc/117.conf

@@ -0,0 +1,11 @@
+arch: amd64
+cores: 1
+features: nesting=1
+hostname: Proxy
+memory: 512
+net0: name=eth0,bridge=vmbr0,firewall=1,hwaddr=BC:24:11:2F:94:86,ip=dhcp,type=veth
+onboot: 0
+ostype: ubuntu
+rootfs: Storage:vm-117-disk-0,size=8G
+swap: 512
+unprivileged: 1