修复token过期不跳转登录页：统一401和业务0002拦截，全局导航跳转

flutter_monisuo/lib/core/network/dio_client.dart

@@ -1,5 +1,6 @@
 import 'package:dio/dio.dart';
 import 'package:flutter/foundation.dart';
+import 'package:flutter/widgets.dart';
 import '../constants/api_endpoints.dart';
 import '../storage/local_storage.dart';
 import 'api_exception.dart';
@@ -17,10 +18,13 @@ class NetworkConfig {
 class DioClient {
   late final Dio _dio;
 
-  /// 未授權回調（token 過期時觸發）
-  VoidCallback? onUnauthorized;
+  /// 全局導航 key，用於未授權時跳轉登錄頁
+  GlobalKey<NavigatorState>? navigatorKey;
 
-  DioClient() {
+  /// 未授權回調（token 過期時觸發 AuthProvider.forceLogout）
+  VoidCallback? onForceLogout;
+
+  DioClient({this.navigatorKey}) {
     _dio = _createDio();
     _setupInterceptors();
     debugPrint('DioClient initialized with baseUrl: ${NetworkConfig.baseUrl}');
@@ -97,12 +101,9 @@ class DioClient {
     if (data is Map<String, dynamic>) {
       final apiResponse = ApiResponse.fromJson(data, fromJson);
       // 檢測業務層未授權（後端返回 HTTP 200 + code "0002"）
-      // 注意：不再自動清除用戶數據，避免誤判
-      // 只有在 HTTP 401 時才清除用戶數據
       if (apiResponse.isUnauthorized) {
         debugPrint('業務層未授權響應: ${apiResponse.message}');
-        // 不再自動調用 onUnauthorized，避免刷新時誤判
-        // onUnauthorized?.call();
+        _handleUnauthorized();
       }
       return apiResponse;
     }
@@ -120,8 +121,7 @@ class DioClient {
     debugPrint('====================');
 
     if (_isUnauthorized(e)) {
-      _clearUserData();
-      onUnauthorized?.call();
+      _handleUnauthorized();
       return ApiResponse.unauthorized('登錄已過期，請重新登錄');
     }
 
@@ -137,6 +137,19 @@ class DioClient {
     LocalStorage.clearUserData();
   }
 
+  /// 統一處理未授權：清除本地數據 → 通知 Provider → 全局跳轉登錄頁
+  void _handleUnauthorized() {
+    _clearUserData();
+    onForceLogout?.call();
+    final context = navigatorKey?.currentContext;
+    if (context != null) {
+      Navigator.of(context).pushNamedAndRemoveUntil(
+        '/login',
+        (route) => false,
+      );
+    }
+  }
+
   String _getErrorMessage(DioException e) {
     switch (e.type) {
       case DioExceptionType.connectionTimeout: