fix: update types for quiz attempts in lesson content

- Add allow_multiple_attempts and latest_attempt to quiz type
- Make quiz fields optional to support conditional return
- Fix AuditAction enum usage in RecommendedCourses service

Backend/src/services/RecommendedCourses.service.ts

@@ -211,7 +211,7 @@ export class RecommendedCoursesService {
             // Audit log
             await auditService.logSync({
                 userId: decoded.id,
-                action: isRecommended ? AuditAction.UPDATE_COURSE : AuditAction.UPDATE_COURSE,
+                action: AuditAction.UPDATE,
                 entityType: 'Course',
                 entityId: courseId,
                 oldValue: { is_recommended: course.is_recommended },

Backend/src/types/CoursesStudent.types.ts

@@ -154,12 +154,20 @@ export interface LessonContentData {
         title: MultiLangText;
         description: MultiLangText | null;
         passing_score: number;
-        time_limit: number | null;
-        shuffle_questions: boolean;
-        shuffle_choices: boolean;
-        is_skippable: boolean;
-        show_answers_after_completion: boolean;
-        questions: {
+        time_limit?: number | null;
+        shuffle_questions?: boolean;
+        shuffle_choices?: boolean;
+        is_skippable?: boolean;
+        show_answers_after_completion?: boolean;
+        allow_multiple_attempts?: boolean;
+        latest_attempt?: {
+            score: number;
+            is_passed: boolean;
+            attempt_number: number;
+            started_at: Date;
+            completed_at: Date | null;
+        };
+        questions?: {
             id: number;
             question: MultiLangText;
             question_type: 'MULTIPLE_CHOICE' | 'TRUE_FALSE' | 'SHORT_ANSWER';