fix(flutter): fix push_service.dart compile errors for huawei_push 6.x

- Add hide RemoteMessage,Importance to huawei_push import (conflicts with
  firebase_messaging and flutter_local_notifications)
- Replace removed HuaweiPush/Event API with Push.getTokenStream/onMessageReceivedStream
- Replace non-existent DioClient() with standalone Dio instance;
  init() now accepts optional authToken parameter

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

it0_app/lib/core/services/push_service.dart

@@ -2,15 +2,16 @@ import 'dart:async';
 import 'dart:io';
 
 import 'package:device_info_plus/device_info_plus.dart';
+import 'package:dio/dio.dart';
 import 'package:firebase_core/firebase_core.dart';
 import 'package:firebase_messaging/firebase_messaging.dart';
 import 'package:flutter/services.dart';
 import 'package:flutter_local_notifications/flutter_local_notifications.dart';
-import 'package:huawei_push/huawei_push.dart';
+import 'package:huawei_push/huawei_push.dart' hide RemoteMessage, Importance;
 import 'package:logger/logger.dart';
 
 import '../config/api_endpoints.dart';
-import '../network/dio_client.dart';
+import '../config/app_config.dart';
 
 /// Platforms that map to backend PushPlatform enum.
 enum PushPlatform { fcm, hms, mi, oppo, vivo }
@@ -37,6 +38,7 @@ class PushService {
 
   final _log = Logger();
   final _localNotifications = FlutterLocalNotificationsPlugin();
+  late final Dio _dio;
 
   static const _androidChannelId   = 'it0_push_high';
   static const _androidChannelName = 'iAgent 通知';
@@ -57,10 +59,17 @@ class PushService {
 
   // ── Public API ─────────────────────────────────────────────────────────────
 
-  Future<void> init({required String deviceId}) async {
+  Future<void> init({required String deviceId, String? authToken}) async {
     if (_initialized) return;
     _initialized = true;
     _deviceId = deviceId;
+    _dio = Dio(BaseOptions(
+      baseUrl: AppConfig.production().apiBaseUrl,
+      headers: {
+        'Content-Type': 'application/json',
+        if (authToken != null) 'Authorization': 'Bearer $authToken',
+      },
+    ));
 
     await _initLocalNotifications();
 
@@ -83,7 +92,7 @@ class PushService {
   Future<void> unregister() async {
     if (_platform == null || _deviceId == null) return;
     try {
-      await DioClient().dio.delete(
+      await _dio.delete(
         ApiEndpoints.notificationDeviceToken,
         data: {
           'platform': _platform!.name.toUpperCase(),
@@ -139,26 +148,24 @@ class PushService {
   // ── HMS (Huawei / Honor) ──────────────────────────────────────────────────
   //
   // huawei_push 6.x API:
-  //   HuaweiPush.getToken()        — triggers async token delivery via onTokenEvent
-  //   HuaweiPush.onTokenEvent      — Stream<TokenEvent> where event.event == Event.ON_NEW_TOKEN
-  //   HuaweiPush.onMessageReceivedEvent — Stream<RemoteMessage>
+  //   Push.getToken(scope)         — triggers async token delivery via getTokenStream
+  //   Push.getTokenStream          — Stream<String>
+  //   Push.onMessageReceivedStream — Stream<RemoteMessage>
 
   Future<void> _initHms() async {
     try {
-      await HuaweiPush.turnOnPush();
+      await Push.turnOnPush();
 
-      // Request token — delivered asynchronously via onTokenEvent
-      HuaweiPush.onTokenEvent.listen((tokenEvent) {
-        if (tokenEvent.event == Event.ON_NEW_TOKEN) {
-          _registerToken(PushPlatform.hms, tokenEvent.result);
-        }
+      // Token delivered asynchronously via getTokenStream
+      Push.getTokenStream.listen((token) {
+        if (token.isNotEmpty) _registerToken(PushPlatform.hms, token);
       });
 
       // Trigger token request
-      HuaweiPush.getToken('');
+      Push.getToken('');
 
       // Foreground messages
-      HuaweiPush.onMessageReceivedEvent.listen((msg) {
+      Push.onMessageReceivedStream.listen((msg) {
         _showLocal(
           title: msg.notification?.title ?? '',
           body:  msg.notification?.body  ?? '',
@@ -166,7 +173,7 @@ class PushService {
       });
 
       // Background tap
-      HuaweiPush.onNotificationOpenedApp.listen((_) => _tapController.add(null));
+      Push.onNotificationOpenedApp.listen((_) => _tapController.add(null));
 
     } catch (e) {
       // HMS init failed on this Huawei device — log and do nothing.
@@ -276,7 +283,7 @@ class PushService {
   Future<void> _registerToken(PushPlatform platform, String token) async {
     _log.i('[Push] Registering token [$platform]');
     try {
-      await DioClient().dio.post(
+      await _dio.post(
         ApiEndpoints.notificationDeviceToken,
         data: {
           'platform': platform.name.toUpperCase(),