fix: remaining DHCP drifts + improve validation script
- Fixed apps LXC 105: /etc/network/interfaces was still 'iface eth0 inet
dhcp' -> changed to static 192.168.8.205/24, killed dhclient, applied
- Fixed mule-images LXC 120: DHCP client had overridden static .136 with
DHCP lease .108 -> killed dhclient, restored .136
- Fixed sophia docs: inventory said .157, actual Proxmox config is .109
- Updated check-caddy-backends.sh: uses curl with connect-timeout for
reliable TCP checks, distinguishes 'port open / no HTTP' from 'unreachable'
dtoro
35b1a25f08