feat: 添加卸载功能 (--uninstall)

- 添加 --uninstall 参数支持一键卸载
- 卸载 CUPS、Avahi、CUPS-PDF 等组件
- 清理配置文件、日志、中文模板
- 添加 --help 参数显示帮助信息

用法:
  ./setup_cups.sh              # 安装
  ./setup_cups.sh --uninstall  # 卸载
  ./setup_cups.sh --help       # 帮助

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

setup_cups.sh

@@ -3,7 +3,9 @@
 # CUPS 打印服务一键配置脚本
 # 适用于 Armbian / Debian / Ubuntu
 # 作者: 自动生成
-# 用法: chmod +x setup_cups.sh && ./setup_cups.sh
+# 用法:
+#   安装: chmod +x setup_cups.sh && ./setup_cups.sh
+#   卸载: ./setup_cups.sh --uninstall
 #
 
 set -e
@@ -1027,5 +1029,94 @@ main() {
     echo ""
 }
 
-# 运行主函数
-main
+# 卸载函数
+uninstall() {
+    echo -e "${RED}"
+    echo "╔══════════════════════════════════════════════════════════╗"
+    echo "║              CUPS 打印服务卸载程序                       ║"
+    echo "╚══════════════════════════════════════════════════════════╝"
+    echo -e "${NC}"
+    echo ""
+
+    check_root
+
+    echo -e "${YELLOW}即将卸载以下组件:${NC}"
+    echo "  - CUPS 打印服务"
+    echo "  - Avahi 服务 (AirPrint)"
+    echo "  - CUPS-PDF 虚拟打印机"
+    echo "  - 中文界面模板"
+    echo "  - 所有打印任务和配置"
+    echo ""
+    read -p "确定要卸载吗? [y/N]: " confirm < /dev/tty
+    confirm=${confirm:-N}
+
+    if [[ ! "$confirm" =~ ^[Yy]$ ]]; then
+        echo "已取消"
+        exit 0
+    fi
+
+    echo ""
+    info "开始卸载..."
+
+    # 停止服务
+    info "停止服务..."
+    systemctl stop cups 2>/dev/null || true
+    systemctl stop avahi-daemon 2>/dev/null || true
+    systemctl disable cups 2>/dev/null || true
+    systemctl disable avahi-daemon 2>/dev/null || true
+
+    # 卸载软件包
+    info "卸载软件包..."
+    apt remove --purge -y cups cups-common cups-client cups-bsd cups-core-drivers \
+        cups-daemon cups-filters cups-ipp-utils cups-pdf cups-ppdc \
+        avahi-daemon 2>/dev/null || true
+
+    # 删除配置和数据
+    info "删除配置和数据..."
+    rm -rf /etc/cups
+    rm -rf /var/spool/cups
+    rm -rf /var/spool/cups-pdf
+    rm -rf /var/log/cups
+    rm -rf /usr/share/cups/templates-zh_CN
+    rm -rf /usr/share/cups/templates-zh
+    rm -rf /usr/share/cups/templates-en-backup
+
+    # 清理依赖
+    info "清理依赖..."
+    apt autoremove -y 2>/dev/null || true
+
+    echo ""
+    echo -e "${GREEN}╔══════════════════════════════════════════════════════════╗${NC}"
+    echo -e "${GREEN}║                    卸载完成!                             ║${NC}"
+    echo -e "${GREEN}╚══════════════════════════════════════════════════════════╝${NC}"
+    echo ""
+}
+
+# 显示帮助
+show_help() {
+    echo "CUPS 打印服务一键配置脚本"
+    echo ""
+    echo "用法:"
+    echo "  $0              安装 CUPS 打印服务"
+    echo "  $0 --uninstall  卸载 CUPS 打印服务"
+    echo "  $0 --help       显示此帮助信息"
+    echo ""
+}
+
+# 解析参数并运行
+case "${1:-}" in
+    --uninstall|-u)
+        uninstall
+        ;;
+    --help|-h)
+        show_help
+        ;;
+    "")
+        main
+        ;;
+    *)
+        echo "未知参数: $1"
+        show_help
+        exit 1
+        ;;
+esac