dnsmasq was failing to start or staying inactive because it was starting
before the bridge members were added. Updated van-ap-dnsmasq.service to
depend on van-br0-setup.service, ensuring the bridge is ready before
dnsmasq binds to br0.
Fixes: DHCP not provisioning addresses on boot.
Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>