init

client/lib/core/constants/app_constants.dart

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+import '../config/environment.dart';
+
+/// 应用常量配置
+class AppConstants {
+  // 应用信息
+  static const String appName = 'AI英语学习';
+  static const String appVersion = '1.0.0';
+  
+  // API配置 - 从环境配置获取
+  static String get baseUrl => EnvironmentConfig.baseUrl;
+  static int get connectTimeout => EnvironmentConfig.connectTimeout;
+  static int get receiveTimeout => EnvironmentConfig.receiveTimeout;
+  
+  // 存储键名
+  static const String accessTokenKey = 'access_token';
+  static const String refreshTokenKey = 'refresh_token';
+  static const String userInfoKey = 'user_info';
+  static const String settingsKey = 'app_settings';
+  
+  // 分页配置
+  static const int defaultPageSize = 20;
+  static const int maxPageSize = 100;
+  
+  // 学习配置
+  static const int dailyWordGoal = 50;
+  static const int maxRetryAttempts = 3;
+  static const Duration studySessionDuration = Duration(minutes: 25);
+  
+  // 音频配置
+  static const double defaultPlaybackSpeed = 1.0;
+  static const double minPlaybackSpeed = 0.5;
+  static const double maxPlaybackSpeed = 2.0;
+  
+  // 图片配置
+  static const int maxImageSize = 5 * 1024 * 1024; // 5MB
+  static const List<String> supportedImageFormats = ['jpg', 'jpeg', 'png', 'webp'];
+  
+  // 缓存配置
+  static const Duration cacheExpiration = Duration(hours: 24);
+  static const int maxCacheSize = 100 * 1024 * 1024; // 100MB
+}
+
+/// 路由常量
+class RouteConstants {
+  static const String splash = '/splash';
+  static const String onboarding = '/onboarding';
+  static const String login = '/login';
+  static const String register = '/register';
+  static const String home = '/home';
+  static const String profile = '/profile';
+  static const String vocabulary = '/vocabulary';
+  static const String vocabularyTest = '/vocabulary/test';
+  static const String listening = '/listening';
+  static const String reading = '/reading';
+  static const String writing = '/writing';
+  static const String speaking = '/speaking';
+  static const String settings = '/settings';
+}
+
+/// 学习等级常量
+enum LearningLevel {
+  beginner('beginner', '初级'),
+  intermediate('intermediate', '中级'),
+  advanced('advanced', '高级');
+  
+  const LearningLevel(this.value, this.label);
+  
+  final String value;
+  final String label;
+}
+
+/// 词库类型常量
+enum VocabularyType {
+  elementary('elementary', '小学'),
+  junior('junior', '初中'),
+  senior('senior', '高中'),
+  cet4('cet4', '四级'),
+  cet6('cet6', '六级'),
+  toefl('toefl', '托福'),
+  ielts('ielts', '雅思'),
+  business('business', '商务'),
+  daily('daily', '日常');
+  
+  const VocabularyType(this.value, this.label);
+  
+  final String value;
+  final String label;
+}