feature/ct template storage
- Allow a per-node custom storage for LXC CT templates
- Don't require the token on a Proxmox environment update
- Auto-stage the ISO/CT-template pick on selection
- Wait for Proxmox's create/delete task to finish before returning
- LXC: start at boot, enable nesting, assign real IPs, optional docker caps
- Revert lxc.cap.drop / docker_enabled — Proxmox's API rejects it
- Show swap and live network state (bridge/VLAN/MAC/IP) on the device page
- LXC: don't write ip=manual when a family has no assigned address
- LXC: set gw=/gw6= from the interface's gateway_ips NetBox custom field