fix: install chrony on host via curl|bash setup path (#366)

The host clock needs an NTP daemon; without one it drifts and SigV4 request
signatures fall outside the skew window, kicking the web console back to /login.
Mirrors the ISO rootfs (iso-builder packages.list) so both host-install paths
ship the same software. Guest VMs track the host via kvm-clock.

Bug: mulga-siv-335

scripts/setup.sh

@@ -221,6 +221,7 @@ install_apt_deps() {
             pciutils \
             jq curl iproute2 netcat-openbsd wget unzip xz-utils file \
             ovn-central ovn-host openvswitch-switch openvswitch-ipsec strongswan-charon dhcpcd-base \
+            chrony \
             > /dev/null
 
         info "System dependencies installed"