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/qemu-server/101.conf

@@ -0,0 +1,20 @@
+agent: 1
+bios: ovmf
+boot: order=ide0;ide2;net0
+cores: 4
+cpu: x86-64-v2-AES
+efidisk0: Storage:vm-101-disk-0,efitype=4m,pre-enrolled-keys=1,size=4M
+ide0: Storage:vm-101-disk-1,size=64G
+ide2: local:iso/en-us_windows_11_consumer_editions_version_23h2_updated_april_2025_x64_dvd_5e6831d3.iso,media=cdrom,size=7198542K
+machine: pc-q35-10.0+pve1
+memory: 4096
+meta: creation-qemu=10.0.2,ctime=1758615516
+name: W11
+net0: e1000=BC:24:11:19:34:DB,bridge=vmbr0,firewall=1
+numa: 0
+ostype: win11
+scsihw: virtio-scsi-single
+smbios1: uuid=39cec2fd-f3e5-4664-b489-ed8db9b70231
+sockets: 1
+tpmstate0: Storage:vm-101-disk-2,size=4M,version=v2.0
+vmgenid: 7ed24d3b-870e-4ab7-ae87-d9e7b01ea73b