Add Ansible playbooks for MeshCore monitoring node deployment

Roles: base (apt, tailscale, motd), meshcore_cli (pipx), meshcore_capture
(agessaman/meshcore-packet-capture + .env.local template), scripts (voltage, bandwidth).

Host vars contain per-device serial ports; group vars hold shared MQTT broker config.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

ansible/roles/base/tasks/main.yml

@@ -0,0 +1,47 @@
+---
+- name: Install base packages
+  apt:
+    name:
+      - screen
+      - pipx
+      - vnstat
+      - git
+    state: present
+  become: true
+
+- name: Set MOTD
+  template:
+    src: motd.j2
+    dest: /etc/motd
+    owner: root
+    group: root
+    mode: "0644"
+  become: true
+
+- name: Add Tailscale apt signing key
+  get_url:
+    url: https://pkgs.tailscale.com/stable/debian/bookworm.nosetup.sh
+    dest: /tmp/tailscale-setup.sh
+    mode: "0755"
+  when: tailscale_auth_key != ""
+
+- name: Run Tailscale install script
+  shell: sh /tmp/tailscale-setup.sh
+  args:
+    creates: /usr/bin/tailscale
+  become: true
+  when: tailscale_auth_key != ""
+
+- name: Enable and start tailscaled
+  systemd:
+    name: tailscaled
+    enabled: true
+    state: started
+  become: true
+  when: tailscale_auth_key != ""
+
+- name: Authenticate Tailscale
+  shell: tailscale up --authkey {{ tailscale_auth_key }}
+  become: true
+  when: tailscale_auth_key != ""
+  no_log: true