feat: 添加主菜单，运行脚本时可选择安装或卸载

- 运行脚本显示主菜单：1)安装 2)卸载 0)退出
- 支持命令行参数：--install / --uninstall
- 优化用户体验

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

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

setup_cups.sh

@@ -1097,22 +1097,63 @@ 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              显示主菜单"
+    echo "  $0 --install    直接安装 CUPS 打印服务"
+    echo "  $0 --uninstall  直接卸载 CUPS 打印服务"
     echo "  $0 --help       显示此帮助信息"
     echo ""
 }
 
+# 显示主菜单
+show_menu() {
+    clear
+    echo -e "${GREEN}"
+    echo "╔══════════════════════════════════════════════════════════╗"
+    echo "║         CUPS 打印服务一键配置脚本                        ║"
+    echo "║         适用于 Armbian / Debian / Ubuntu                 ║"
+    echo "╚══════════════════════════════════════════════════════════╝"
+    echo -e "${NC}"
+    echo ""
+    echo "  请选择操作："
+    echo ""
+    echo "    1) 安装 CUPS 打印服务"
+    echo "    2) 卸载 CUPS 打印服务"
+    echo "    0) 退出"
+    echo ""
+    read -p "  请输入选项 [1/2/0]: " choice < /dev/tty
+
+    case "$choice" in
+        1)
+            main
+            ;;
+        2)
+            uninstall
+            ;;
+        0)
+            echo "已退出"
+            exit 0
+            ;;
+        *)
+            echo "无效选项，请重新选择"
+            sleep 1
+            show_menu
+            ;;
+    esac
+}
+
 # 解析参数并运行
 case "${1:-}" in
     --uninstall|-u)
         uninstall
         ;;
+    --install|-i)
+        main
+        ;;
     --help|-h)
         show_help
         ;;
     "")
-        main
+        show_menu
         ;;
     *)
         echo "未知参数: $1"