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/main.dart

@@ -24,6 +24,9 @@ import 'ui/pages/auth/login_page.dart';
 import 'ui/pages/main/main_page.dart';
 import 'ui/pages/onboarding/onboarding_page.dart';
 
+/// 全局導航 Key，用於 token 過期時全局跳轉登錄頁
+final GlobalKey<NavigatorState> navigatorKey = GlobalKey<NavigatorState>();
+
 void main() async {
   // 確保 Flutter 綁定初始化
   WidgetsFlutterBinding.ensureInitialized();
@@ -72,7 +75,7 @@ class MyApp extends StatelessWidget {
   }
 
   List<SingleChildWidget> _buildProviders() {
-    final dioClient = DioClient();
+    final dioClient = DioClient(navigatorKey: navigatorKey);
 
     return [
       // Theme Provider (必須放在最前面)
@@ -93,7 +96,7 @@ class MyApp extends StatelessWidget {
         create: (ctx) {
           final authProvider = AuthProvider(ctx.read<UserService>());
           // token 過期時，DioClient 回調 AuthProvider 強制登出
-          dioClient.onUnauthorized = authProvider.forceLogout;
+          dioClient.onForceLogout = authProvider.forceLogout;
           return authProvider;
         },
       ),
@@ -112,6 +115,7 @@ class MyApp extends StatelessWidget {
 
   Widget _buildMaterialApp(BuildContext context, ThemeMode themeMode) {
     return MaterialApp(
+      navigatorKey: navigatorKey,
       debugShowCheckedModeBanner: false,
       theme: AppTheme.lightTheme,
       darkTheme: AppTheme.darkTheme,