feat(ansible): add K3s installation playbooks and configuration templates

ansible/roles/common/handlers/main.yml

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+---
+- name: Apply sysctl
+  ansible.builtin.command: sysctl --system
+

ansible/roles/common/tasks/main.yml

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+# 基础配置 Role
+# 功能: hostname、sysctl、Tailscale 安装
+---
+- name: Set hostname
+  ansible.builtin.hostname:
+    name: "{{ node_hostname }}"
+  when: node_hostname is defined
+
+- name: Update /etc/hosts
+  ansible.builtin.lineinfile:
+    path: /etc/hosts
+    regexp: '^127\.0\.1\.1'
+    line: "127.0.1.1 {{ node_hostname }}"
+  when: node_hostname is defined
+
+- name: Configure sysctl for IP forwarding
+  ansible.builtin.copy:
+    dest: /etc/sysctl.d/99-k3s.conf
+    content: |
+      net.ipv4.ip_forward = 1
+      net.ipv6.conf.all.forwarding = 1
+    mode: '0644'
+  notify: Apply sysctl
+
+- name: Install dependencies
+  ansible.builtin.apt:
+    name: [curl, wget, ca-certificates]
+    state: present
+    update_cache: yes
+
+- name: Check if Tailscale is installed
+  ansible.builtin.command: which tailscale
+  register: tailscale_check
+  ignore_errors: yes
+  changed_when: false
+
+- name: Install Tailscale
+  ansible.builtin.shell: curl -fsSL https://tailscale.com/install.sh | sh
+  when: tailscale_check.rc != 0
+
+- name: Enable Tailscale service
+  ansible.builtin.systemd:
+    name: tailscaled
+    enabled: yes
+    state: started
+