- Implement list_evpn_zones with full zone configuration parsing
- Implement create_evpn_zone, update_evpn_zone, delete_evpn_zone
- Implement list_vnets with full virtual network configuration
- Implement create_vnet, update_vnet, delete_vnet
- Implement get_vnet_status and list_dhcp_leases
- All operations use proper error handling with Option safety
- Add 2 unit tests for EVPN zone and virtual network serialization