init

client/lib/features/reading/models/reading_exercise_model.dart

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+/// 阅读练习类型枚举
+enum ReadingExerciseType {
+  news,        // 新闻
+  story,       // 故事
+  science,     // 科学
+  business,    // 商务
+  culture,     // 文化
+  technology,  // 科技
+  health,      // 健康
+  travel,      // 旅游
+}
+
+/// 阅读难度枚举
+enum ReadingDifficulty {
+  elementary,        // 初级 A1-A2
+  intermediate,      // 中级 B1
+  upperIntermediate, // 中高级 B2
+  advanced,          // 高级 C1
+  proficient,        // 精通 C2
+}
+
+/// 阅读练习分类
+class ReadingCategory {
+  final String id;
+  final String name;
+  final String description;
+  final String icon;
+  final int articleCount;
+  final ReadingExerciseType type;
+
+  const ReadingCategory({
+    required this.id,
+    required this.name,
+    required this.description,
+    required this.icon,
+    required this.articleCount,
+    required this.type,
+  });
+}
+
+/// 阅读练习
+class ReadingExercise {
+  final String id;
+  final String title;
+  final String content;
+  final String summary;
+  final ReadingExerciseType type;
+  final ReadingDifficulty difficulty;
+  final int wordCount;
+  final int estimatedTime; // 预估阅读时间（分钟）
+  final List<ReadingQuestion> questions;
+  final List<String> tags;
+  final String source;
+  final DateTime publishDate;
+  final String imageUrl;
+
+  const ReadingExercise({
+    required this.id,
+    required this.title,
+    required this.content,
+    required this.summary,
+    required this.type,
+    required this.difficulty,
+    required this.wordCount,
+    required this.estimatedTime,
+    required this.questions,
+    required this.tags,
+    required this.source,
+    required this.publishDate,
+    required this.imageUrl,
+  });
+}
+
+/// 阅读问题
+class ReadingQuestion {
+  final String id;
+  final String question;
+  final List<String> options;
+  final int correctAnswer; // 正确答案的索引
+  final String explanation;
+  final String type; // multiple_choice, true_false, fill_blank
+
+  const ReadingQuestion({
+    required this.id,
+    required this.question,
+    required this.options,
+    required this.correctAnswer,
+    required this.explanation,
+    required this.type,
+  });
+}
+
+/// 阅读结果
+class ReadingResult {
+  final String exerciseId;
+  final int correctAnswers;
+  final int totalQuestions;
+  final int readingTime; // 实际阅读时间（秒）
+  final DateTime completedAt;
+  final List<UserAnswer> userAnswers;
+
+  const ReadingResult({
+    required this.exerciseId,
+    required this.correctAnswers,
+    required this.totalQuestions,
+    required this.readingTime,
+    required this.completedAt,
+    required this.userAnswers,
+  });
+
+  double get accuracy => correctAnswers / totalQuestions;
+}
+
+/// 用户答案
+class UserAnswer {
+  final String questionId;
+  final int selectedAnswer;
+  final bool isCorrect;
+
+  const UserAnswer({
+    required this.questionId,
+    required this.selectedAnswer,
+    required this.isCorrect,
+  });
+}