优化节点列表国旗显示问题

(cherry picked from commit 7b9d6bb33be8b0c619d35b835017e963d5bdc97f)

lib/app/modules/kr_home/views/kr_home_node_list_view.dart

@@ -542,27 +542,17 @@ class KRHomeNodeListView extends GetView<KRHomeController> {
       }
     }
 
-    // 获取图标颜色
-    Color? getIconColor(int delay) {
-      if (delay == 0) {
-        return null;
-      } else if (delay >= 3000) {
-        return Colors.red;
-      }
-      return null;
-    }
-
     return Container(
       key: ValueKey(item.id),
       padding: EdgeInsets.symmetric(vertical: 8.w),
       child: Row(
         crossAxisAlignment: CrossAxisAlignment.center,
         children: [
-          KrLocalImage(
-            imageName: "home_list_location",
+          // 🔧 修改：显示国旗代替图标
+          KRCountryFlag(
+            countryCode: item.country,
             width: 36.w,
             height: 36.w,
-            color: getIconColor(item.urlTestDelay.value),
           ),
           SizedBox(width: 8.w),
           Expanded(