perf: 禁用主机名查找加速打印任务提交

- 添加 HostNameLookups Off 配置
- 解决手机发送打印任务慢的问题（DNS反向解析延迟）

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

setup_cups.sh

@@ -786,6 +786,11 @@ configure_cups() {
         echo "Browsing Yes" >> /etc/cups/cupsd.conf
     fi
 
+    # 禁用主机名查找（加速打印任务提交）
+    if ! grep -q "^HostNameLookups" /etc/cups/cupsd.conf; then
+        echo "HostNameLookups Off" >> /etc/cups/cupsd.conf
+    fi
+
     # 修改 Policy default 允许匿名打印
     # 找到 <Limit Create-Job Print-Job Print-URI Validate-Job> 块并修改
     sed -i '/<Limit Create-Job Print-Job Print-URI Validate-Job>/,/<\/Limit>/{