Add Proxmox LXC Deployment

Proxmox-LXC-Deployment.md

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+# Proxmox LXC Deployment
+
+Athenix supports building and deploying NixOS LXC containers to Proxmox.
+
+## Requirements
+
+- Proxmox VE
+- SSH access to the host
+- Host configured with `boot.isContainer = true`
+
+## Build LXC Tarball
+
+```bash
+nix build .#lxc-nix-builder
+```
+
+## Deploy
+
+Use the provided deployment script:
+
+```bash
+./installer/deploy-proxmox-lxc.sh nix-builder pve.example.com --start
+```
+
+## Management
+
+After deployment, containers are managed using standard Proxmox tools.