feat(ansible): add OpenWrt dlink AP configuration

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).

ansible/inventory/hosts.yml

@@ -4,3 +4,9 @@ all:
       hosts:
         crs418:
           ansible_host: 192.168.255.10
+    openwrt:
+      hosts:
+        dlink:
+          ansible_host: 192.168.255.11
+          ansible_user: root
+          ansible_ssh_port: 22