feat(rustdesk): onboard self-hosted RustDesk server on hk2

Deploy hbbs + hbbr via a safe-by-default Ansible role (playbooks/rustdesk.yml):
with rustdesk_confirm=false it only reports whether compose.yml matches live
state and refuses to recreate the stack; with rustdesk_confirm=true it deploys
and recreates. The relay assert rejects the known-bad hk2.wsvc.info hostname.

Add health profiles rustdesk (hbbs/hbbr health, relay DNS) and hk2aux (co-located
traefik/adguard/remark42 on hk2), plus the rustdesk-health runbook and AGENTS.md
entry. Server image pinned rustdesk/rustdesk-server:1.1.14.

ansible/roles/rustdesk/tasks/main.yml

@@ -0,0 +1,85 @@
+---
+# Deploy/reconcile the self-hosted RustDesk server (hbbs + hbbr).
+# Idempotent: deploys the declared compose file; only recreates the stack with
+# explicit confirmation.
+
+- name: Validate relay address is set and not the known-bad value
+  ansible.builtin.assert:
+    that:
+      - rustdesk_relay | length > 0
+      - "'hk2.wsvc.info' not in rustdesk_relay"
+    fail_msg: >-
+      rustdesk_relay must be a resolvable relay address. The known-bad
+      'hk2.wsvc.info' has no DNS record and must not be used.
+
+- name: Ensure compose project directory exists
+  ansible.builtin.file:
+    path: "{{ rustdesk_compose_dir }}"
+    state: directory
+    owner: windy
+    group: root
+    mode: "0755"
+
+- name: Deploy compose file
+  ansible.builtin.template:
+    src: compose.yml.j2
+    dest: "{{ rustdesk_compose_dir }}/compose.yml"
+    owner: windy
+    group: windy
+    mode: "0644"
+  register: rustdesk_compose_deployed
+
+- name: Report no change needed
+  ansible.builtin.debug:
+    msg: "compose.yml already matches declared state; no change needed."
+  when: not rustdesk_compose_deployed.changed
+
+- name: Refuse to recreate without explicit confirmation
+  ansible.builtin.fail:
+    msg: >-
+      compose.yml differs from declared state but rustdesk_confirm is not true.
+      Supply rustdesk_confirm=true to deploy the file and recreate the stack.
+  when:
+    - rustdesk_compose_deployed.changed
+    - not (rustdesk_confirm | bool)
+    - not ansible_check_mode
+
+- name: Apply compose stack
+  ansible.builtin.command:
+    argv:
+      - docker
+      - compose
+      - --project-directory
+      - "{{ rustdesk_compose_dir }}"
+      - up
+      - -d
+  when:
+    - rustdesk_compose_deployed.changed
+    - rustdesk_confirm | bool
+  changed_when: true
+  register: rustdesk_apply
+
+- name: Verify hbbs relay command
+  ansible.builtin.command:
+    argv:
+      - docker
+      - inspect
+      - hbbs
+      - --format
+      - '{{ "{{" }}json .Config.Cmd{{ "}}" }}'
+  register: rustdesk_hbbs_cmd
+  changed_when: false
+  when:
+    - rustdesk_compose_deployed.changed
+    - rustdesk_confirm | bool
+    - not ansible_check_mode
+
+- name: Assert hbbs advertises the declared relay
+  ansible.builtin.assert:
+    that:
+      - "'{{ rustdesk_relay }}' in rustdesk_hbbs_cmd.stdout"
+    fail_msg: "hbbs is not advertising the declared relay {{ rustdesk_relay }}."
+  when:
+    - rustdesk_compose_deployed.changed
+    - rustdesk_confirm | bool
+    - not ansible_check_mode