feat: 将PDF打印机改为可选安装（选项7）

- 在驱动选择菜单添加选项7: 虚拟PDF打印机
- 默认选项改为 "1 7" (通用驱动 + PDF打印机)
- PDF打印机不再强制安装，用户可自行选择
- 完成提示根据是否安装PDF打印机动态显示

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

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

setup_cups.sh

@@ -430,12 +430,13 @@ select_drivers() {
     echo "  4) 兄弟 (brlaser)"
     echo "  5) 奔图 Pantum (从官网下载)"
     echo "  6) 全部安装 (不含奔图)"
+    echo "  7) 虚拟 PDF 打印机 (测试连接用，无需真实打印机)"
     echo "  0) 仅安装CUPS (不安装额外驱动)"
     echo ""
-    echo -e "  ${BLUE}示例: 1 5 或 1,5 表示同时安装通用驱动和奔图驱动${NC}"
+    echo -e "  ${BLUE}示例: 1 7 或 1,7 表示同时安装通用驱动和虚拟PDF打印机${NC}"
     echo ""
-    read -p "请输入选项 (默认: 1): " driver_choice < /dev/tty
-    driver_choice=${driver_choice:-1}
+    read -p "请输入选项 (默认: 1 7): " driver_choice < /dev/tty
+    driver_choice=${driver_choice:-"1 7"}
     # 统一分隔符
     driver_choice=$(echo "$driver_choice" | tr ',' ' ')
 }
@@ -519,6 +520,7 @@ install_pantum_driver() {
 install_drivers() {
     local packages=""
     local install_pantum=false
+    local install_pdf=false
 
     for choice in $driver_choice; do
         case $choice in
@@ -545,6 +547,9 @@ install_drivers() {
                 info "添加全部驱动..."
                 packages="printer-driver-all hplip printer-driver-gutenprint printer-driver-brlaser"
                 ;;
+            7)
+                install_pdf=true
+                ;;
             0)
                 info "跳过驱动安装"
                 return 0
@@ -561,6 +566,11 @@ install_drivers() {
     if [ "$install_pantum" = true ]; then
         install_pantum_driver
     fi
+
+    # 安装虚拟PDF打印机
+    if [ "$install_pdf" = true ]; then
+        install_pdf_printer
+    fi
 }
 
 # 安装虚拟PDF打印机（用于测试连接）
@@ -759,8 +769,6 @@ main() {
     echo "  $step. 将当前用户添加到 lpadmin 组"
     ((step++))
     echo "  $step. 启动并设置开机自启"
-    ((step++))
-    echo "  $step. 安装虚拟 PDF 打印机（测试用）"
     echo ""
     read -p "是否继续? [Y/n]: " confirm < /dev/tty
     confirm=${confirm:-Y}
@@ -847,9 +855,6 @@ main() {
     systemctl enable avahi-daemon
     success "Avahi 服务已启动并设置开机自启"
 
-    # 7. 安装虚拟PDF打印机（用于测试）
-    install_pdf_printer
-
     # 更新IP地址（如果配置了静态IP）
     LOCAL_IP=$(get_ip)
 
@@ -867,14 +872,22 @@ main() {
     echo -e "  ${BLUE}用户名:${NC} root"
     echo -e "  ${BLUE}密码:${NC} 你的 SSH 密码"
     echo ""
+    # 检查是否安装了PDF打印机
+    if lpstat -p PDF 2>/dev/null | grep -q "PDF"; then
         echo -e "  ${GREEN}[PDF打印机]${NC} 已安装虚拟 PDF 打印机用于测试"
         echo -e "  ${GREEN}            ${NC} PDF 输出目录: /var/spool/cups-pdf/"
         echo ""
+    fi
     echo -e "  ${YELLOW}下一步:${NC}"
     echo "  1. 用浏览器打开上面的地址"
+    if lpstat -p PDF 2>/dev/null | grep -q "PDF"; then
         echo "  2. 可使用已安装的 PDF 打印机测试连接"
         echo "  3. 点击 Administration → Add Printer 添加真实打印机"
         echo "  4. 勾选 Share This Printer"
+    else
+        echo "  2. 点击 Administration → Add Printer 添加打印机"
+        echo "  3. 勾选 Share This Printer"
+    fi
     echo ""
     echo -e "  ${YELLOW}客户端连接:${NC}"
     echo "  - Windows: 设置 → 打印机 → 添加打印机"