fix: 修改样式

lib/app/services/singbox_imp/kr_sing_box_imp.dart

@@ -607,6 +607,15 @@ class KRSingBoxImp {
       KRLogUtil.kr_i('✅ [智能代理模式] region 设为 $effectiveRegion', tag: 'SingBox');
     }
 
+    final useWindowsDnsDefaults = Platform.isWindows;
+    final remoteDnsAddress = useWindowsDnsDefaults
+        ? 'udp://1.1.1.1'
+        : 'https://dns.google/dns-query';
+    final directDnsAddress = useWindowsDnsDefaults
+        ? (effectiveRegion == 'cn' ? 'udp://223.5.5.5' : 'udp://1.1.1.1')
+        : 'local';
+    final dnsDomainStrategy = useWindowsDnsDefaults ? '' : 'prefer_ipv4';
+
     final op = {
       "region": effectiveRegion, // 🔧 修复：根据出站模式动态设置 region
       "block-ads": false, // 参考 hiddify-app: 默认关闭广告拦截
@@ -616,11 +625,10 @@ class KRSingBoxImp {
       "resolve-destination": false,
       "ipv6-mode":
           "ipv4_only", // 参考 hiddify-app: 仅使用 IPv4 (有效值: ipv4_only, prefer_ipv4, prefer_ipv6, ipv6_only)
-      "remote-dns-address":
-          "https://dns.google/dns-query", // 使用 Google DoH，避免中转节点 DNS 死锁
-      "remote-dns-domain-strategy": "prefer_ipv4",
-      "direct-dns-address": "local", // 使用系统 DNS，确保中转服务器域名能被解析
-      "direct-dns-domain-strategy": "prefer_ipv4",
+      "remote-dns-address": remoteDnsAddress,  // 使用 Google DoH，避免中转节点 DNS 死锁
+      "remote-dns-domain-strategy": dnsDomainStrategy,
+      "direct-dns-address": directDnsAddress,  // 使用系统 DNS，确保中转服务器域名能被解析
+      "direct-dns-domain-strategy": dnsDomainStrategy,
       "mixed-port": kr_port,
       "tproxy-port": kr_port,
       "local-dns-port": 36450,