feat(app): 请求头加语言

@@ -4,6 +4,7 @@ abstract final class NetworkConst {
   static const Duration receiveTimeout = Duration(seconds: 30);
 
   static const String headerUserAgent = 'User-Agent';
+  static const String headerAcceptLanguage = 'Accept-Language';
   static const String headerAccessToken = 'access_token';
 
   static const String contentTypeApplicationJson = 'application/json';

+import 'dart:ui' as ui;
+
 import 'package:dio/dio.dart';
+import 'package:get/get.dart';
 
-import '../../constants/app_const.dart';
 import '../../constants/network_const.dart';
 import '../dio_extra.dart';
 import '../user_agent_provider.dart';
@@ -17,6 +19,10 @@ class TokenInterceptor extends Interceptor {
       NetworkConst.headerUserAgent,
       () => _buildUserAgent(),
     );
+    options.headers.putIfAbsent(
+      NetworkConst.headerAcceptLanguage,
+      () => _buildAcceptLanguage(),
+    );
 
     if (options.extra[DioExtra.noToken] == true) {
       handler.next(options);
@@ -43,6 +49,17 @@ class TokenInterceptor extends Interceptor {
     handler.next(options);
   }
 
+  String _buildAcceptLanguage() {
+    try {
+      final currentLocale = Get.locale ?? ui.PlatformDispatcher.instance.locale;
+      final tag = currentLocale.toLanguageTag();
+      if (tag.isNotEmpty && tag != 'und') {
+        return tag;
+      }
+    } catch (_) {}
+    return 'en';
+  }
+
   /// 构建完整 User-Agent，格式与 Android 端 [DeviceInfoUtils.userAgent] 完全一致：
   /// `{systemWebViewUA} doublefeel/{versionCode}({versionName})({manufacturer}##{brand}##{model}; Android{sdkInt}; {height}x{width})(huawei)`
   ///