Add community.openwrt collection, dlink host to inventory,
openwrt role with system/network/firewall tasks, and two
playbooks: dlink-init.yml for one-time bootstrap from factory
IP, and openwrt.yml for ongoing idempotent configuration.
Network: MGMT untagged + LAN (vlan2) tagged on WAN port trunk
to MikroTik ether3. Firewall zones replace factory WAN/LAN
with mgmt (input ACCEPT) and lan (forward ACCEPT, AP mode).
Move flat tasks/ and vars/routeros-secrets.yml into
roles/routeros/ with a main.yml that imports the domain
task files in order. Update playbooks/routeros.yml to
use the role instead of importing tasks directly.