feat: 添加得分占比计算功能；优化时间格式化工具函数；更新考试记录和用户任务页面以显示得分占比；新增得分占比测试用例；修复时间解析逻辑

api/controllers/quizController.ts

@@ -86,6 +86,7 @@ export class QuizController {
       }
 
       const processedAnswers = [];
+      let totalPossibleScore = 0;
       for (const answer of answers) {
         const question = await QuestionModel.findById(answer.questionId);
         if (!question) {
@@ -93,6 +94,8 @@ export class QuizController {
           continue;
         }
 
+        totalPossibleScore += Number(question.score) || 0;
+
         if (question.type === 'multiple') {
           const optionCount = question.options ? question.options.length : 0;
           const unitScore = optionCount > 0 ? question.score / optionCount : 0;
@@ -160,7 +163,7 @@ export class QuizController {
         processedAnswers.push(answer);
       }
 
-      const result = await QuizModel.submitQuiz({ userId, answers: processedAnswers });
+      const result = await QuizModel.submitQuiz({ userId, answers: processedAnswers, totalPossibleScore });
 
       if (subjectId || taskId) {
         let finalSubjectId: string | null = subjectId || null;