feat(auth): 添加启动认证功能

- 在本地化文件中添加认证相关的多语言支持
- 实现密码验证逻辑和锁定机制
- 创建登录页面UI组件
- 集成路由保护，未认证用户自动重定向到登录页
- 支持密码错误次数限制和倒计时锁定功能

lib/core/router/app_router.dart

@@ -1,22 +1,53 @@
+import 'package:flutter/material.dart';
 import 'package:flutter_riverpod/flutter_riverpod.dart';
 import 'package:go_router/go_router.dart';
 
+import '../../features/auth/pages/login_page.dart';
 import '../../features/home/pages/home_page.dart';
 import '../../features/programs/pages/programs_page.dart';
 import '../../features/program_detail/pages/program_detail_page.dart';
 import '../../features/settings/pages/settings_page.dart';
 import '../../features/home/pages/complete_page.dart';
+import '../../features/auth/providers/auth_provider.dart';
+
+final _authRefreshStream = AuthRefreshStream();
 
 /// 应用路由配置
 final goRouterProvider = Provider<GoRouter>((ref) {
+  final authState = ref.watch(authProvider);
+
+  // 监听认证状态变化，触发 GoRouter 重新评估 redirect
+  ref.listen(authProvider, (prev, next) {
+    _authRefreshStream.notify();
+  });
+
   return GoRouter(
     initialLocation: '/',
+    redirect: (context, state) {
+      final isAuthenticated = authState.status == AuthStatus.authenticated;
+      final isLoginPage = state.uri.path == '/login';
+
+      if (!isAuthenticated && !isLoginPage) {
+        return '/login';
+      }
+
+      if (isAuthenticated && isLoginPage) {
+        return '/';
+      }
+
+      return null;
+    },
+    refreshListenable: _authRefreshStream,
     routes: [
+      GoRoute(
+        path: '/login',
+        name: 'login',
+        builder: (context, state) => const LoginPage(),
+      ),
       GoRoute(
         path: '/',
         name: 'home',
         builder: (context, state) {
-          // 支持 ?tab=N 查询参数,用于从其他页面跳回首页并切换到指定 tab
           final tabParam = state.uri.queryParameters['tab'];
           final initialTab = int.tryParse(tabParam ?? '') ?? 0;
           return HomePage(initialTab: initialTab);
@@ -47,4 +78,9 @@ final goRouterProvider = Provider<GoRouter>((ref) {
       ),
     ],
   );
-});
+});
+
+/// 桥接 Riverpod 到 GoRouter 的 refreshListenable
+class AuthRefreshStream extends ChangeNotifier {
+  void notify() => notifyListeners();
+}