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/roles/openwrt/tasks/preflight.yml

@@ -0,0 +1,11 @@
+---
+- name: Verify connectivity to OpenWrt device
+  community.openwrt.ping:
+
+- name: Gather OpenWrt facts
+  community.openwrt.setup:
+  register: openwrt_facts
+
+- name: Show device info
+  ansible.builtin.debug:
+    msg: "Managing {{ inventory_hostname }} ({{ openwrt_facts.ansible_facts.ansible_system | default('OpenWrt') }})"