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/dell-proxmox/lxc/107.conf

@@ -0,0 +1,41 @@
+arch: amd64
+cores: 2
+features: nesting=1
+hostname: Virtualmin
+memory: 2048
+net0: name=eth0,bridge=vmbr1,firewall=1,hwaddr=BC:24:11:AA:20:40,ip=dhcp,type=veth
+onboot: 1
+ostype: debian
+parent: snap2
+rootfs: local-lvm:vm-107-disk-0,size=20G
+swap: 1024
+unprivileged: 1
+
+[Snap1]
+arch: amd64
+cores: 2
+features: nesting=1
+hostname: Virtualmin
+memory: 2048
+net0: name=eth0,bridge=vmbr1,firewall=1,hwaddr=BC:24:11:AA:20:40,ip=dhcp,type=veth
+onboot: 1
+ostype: debian
+rootfs: local-lvm:vm-107-disk-0,size=20G
+snaptime: 1748346112
+swap: 1024
+unprivileged: 1
+
+[snap2]
+arch: amd64
+cores: 2
+features: nesting=1
+hostname: Virtualmin
+memory: 2048
+net0: name=eth0,bridge=vmbr1,firewall=1,hwaddr=BC:24:11:AA:20:40,ip=dhcp,type=veth
+onboot: 1
+ostype: debian
+parent: Snap1
+rootfs: local-lvm:vm-107-disk-0,size=20G
+snaptime: 1748383156
+swap: 1024
+unprivileged: 1