feat(identity): identity, DNS, NTP, service hardening

Implements Task 5. Disables telnet/ftp/www/www-ssl/api/api-ssl (winbox kept
for recovery), sets DNS + NTP client, ensures SSH on the configured port.
Verified run-twice idempotent (changed=0) against crs310-maker on the bench.
Also sets ansible_user=sjat in host_vars for day-2 key auth.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

host_vars/crs310-maker.yml

@@ -10,6 +10,10 @@
 # group_vars/mikrotik.vault.yml). Key login verified. Default `admin` still enabled
 # (not yet hardened). Switch currently on the bench at 192.168.88.1 (defconf, not yet
 # reset/VLAN-configured). Real mgmt addressing below is the FUTURE production plan.
+# Day-2 connection: key auth as the named admin user (overrides the bootstrap
+# default ansible_user=admin in group_vars/mikrotik.yml).
+ansible_user: sjat
+
 switch_identity_name: "crs310-maker"
 switch_mgmt_vlan_id: 99
 switch_mgmt_address: "10.0.99.2/24"      # EDIT: real mgmt IP

roles/makerfloss.mikrotik_switch/tasks/identity.yml

@@ -1,4 +1,37 @@
 ---
-- name: Placeholder
-  ansible.builtin.debug:
-    msg: "not yet implemented"
+# Identity, management services, DNS/NTP and service hardening.
+# All commands here are `set` on singleton/named items, so they are naturally
+# idempotent; RouterOS `command` cannot report change, hence `changed_when: false`.
+
+- name: Set system identity
+  community.routeros.command:
+    commands:
+      - /system/identity/set name="{{ switch_identity_name }}"
+  changed_when: false
+
+- name: Configure DNS servers
+  community.routeros.command:
+    commands:
+      - /ip/dns/set servers="{{ switch_dns_servers }}" allow-remote-requests=no
+  changed_when: false
+
+- name: Configure NTP client
+  community.routeros.command:
+    commands:
+      - /system/ntp/client/set enabled=yes servers="{{ switch_ntp_servers }}"
+  changed_when: false
+
+- name: Disable unused IP services (hardening; winbox kept for recovery)
+  community.routeros.command:
+    commands:
+      - /ip/service/set {{ item }} disabled=yes
+  loop: "{{ switch_disabled_services }}"
+  loop_control:
+    label: "{{ item }}"
+  changed_when: false
+
+- name: Ensure SSH service is enabled on the configured port
+  community.routeros.command:
+    commands:
+      - /ip/service/set ssh disabled=no port={{ switch_ssh_port }}
+  changed_when: false