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/localization/app_localizations.dart

@@ -231,6 +231,20 @@ class AppLocalizations {
   String get usbUsageStep3 => _localizedValues[locale.languageCode]?['usbUsageStep3'] ?? '检测成功后点击"导入程序"加载程序列表';
   String get usbPathInvalid => _localizedValues[locale.languageCode]?['usbPathInvalid'] ?? 'U盘路径无效';
 
+  // ---- 启动认证 ----
+  String get authTitle => _localizedValues[locale.languageCode]?['authTitle'] ?? '身份验证';
+  String get authSubtitle => _localizedValues[locale.languageCode]?['authSubtitle'] ?? '请输入操作员密码以继续使用';
+  String get enterPassword => _localizedValues[locale.languageCode]?['enterPassword'] ?? '请输入密码';
+  String get passwordError => _localizedValues[locale.languageCode]?['passwordError'] ?? '密码错误';
+  String lockCountdown(int seconds) =>
+    locale.languageCode == 'en'
+      ? 'Please wait $seconds seconds to retry'
+      : '请等待 $seconds 秒后重试';
+  String remainingAttempts(int count) =>
+    locale.languageCode == 'en'
+      ? '$count attempt${count > 1 ? 's' : ''} remaining'
+      : '剩余 $count 次尝试机会';
+
   // ---- 通用 ----
   String get back => _localizedValues[locale.languageCode]?['back'] ?? '返回';
   String get totalProgress => _localizedValues[locale.languageCode]?['totalProgress'] ?? '总进度';
@@ -427,6 +441,10 @@ class AppLocalizations {
       'usbUsageStep2': '插入 U盘后点击"重新检测"',
       'usbUsageStep3': '检测成功后点击"导入程序"加载程序列表',
       'usbPathInvalid': 'U盘路径无效',
+      'authTitle': '身份验证',
+      'authSubtitle': '请输入操作员密码以继续使用',
+      'enterPassword': '请输入密码',
+      'passwordError': '密码错误',
       'back': '返回',
       'totalProgress': '总进度',
       'appTitle': '污水毒品快检一体机',
@@ -607,6 +625,10 @@ class AppLocalizations {
       'usbUsageStep2': 'Insert USB then click "Re-detect"',
       'usbUsageStep3': 'After detection, click "Import Programs" to load',
       'usbPathInvalid': 'USB path invalid',
+      'authTitle': 'Authentication',
+      'authSubtitle': 'Enter operator password to continue',
+      'enterPassword': 'Enter password',
+      'passwordError': 'Password incorrect',
       'back': 'Back',
       'totalProgress': 'Total Progress',
       'appTitle': 'Wastewater Drug Detection System',

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();
+}