新增调试信息

lib/app/services/singbox_imp/kr_sing_box_imp.dart

@@ -97,6 +97,36 @@ class KRSingBoxImp {
   /// Stream 订阅管理器
   final List<StreamSubscription<dynamic>> _kr_subscriptions = [];
 
+  /// 当前混合代理端口是否就绪
+  bool get kr_isProxyReady => kr_status.value is SingboxStarted;
+
+  String? _lastProxyRule;
+
+  /// 构建 Dart HttpClient 可识别的代理规则字符串
+  ///
+  /// 当 sing-box 尚未启动时返回 `DIRECT`，启动后返回
+  /// `PROXY 127.0.0.1:<port>; DIRECT`，以便在代理不可用时自动回落。
+  String kr_buildProxyRule({bool includeDirectFallback = true}) {
+    if (!kr_isProxyReady) {
+      const directRule = 'DIRECT';
+      if (_lastProxyRule != directRule) {
+        KRLogUtil.kr_i('⏳ sing-box 未就绪，使用 DIRECT 直连', tag: 'SingBox');
+        _lastProxyRule = directRule;
+      }
+      return directRule;
+    }
+    final proxyRule = StringBuffer('PROXY 127.0.0.1:$kr_port');
+    if (includeDirectFallback) {
+      proxyRule.write('; DIRECT');
+    }
+    final ruleString = proxyRule.toString();
+    if (_lastProxyRule != ruleString) {
+      KRLogUtil.kr_i('🛠️ 使用代理规则: $ruleString', tag: 'SingBox');
+      _lastProxyRule = ruleString;
+    }
+    return ruleString;
+  }
+
   /// 初始化
   Future<void> init() async {
     try {
@@ -426,8 +456,10 @@ class KRSingBoxImp {
 
     kr_outbounds = outbounds;
 
-    final map = {};
-    map["outbounds"] = kr_outbounds;
+    // 只保存 outbounds，Mobile.buildConfig() 会添加其他配置
+    final map = {
+      "outbounds": kr_outbounds
+    };
 
     final file = _file(kr_configName);
     final temp = _tempFile(kr_configName);