feat: add is_skippable field to Quiz model with default value true

Add is_skippable boolean field to Quiz schema, update quiz creation and update logic to handle the new field, and include it in student course content responses. Update seed data and type definitions accordingly.

Backend/prisma/schema.prisma

@@ -302,6 +302,7 @@ model Quiz {
   shuffle_questions             Boolean   @default(false)
   shuffle_choices               Boolean   @default(false)
   show_answers_after_completion Boolean   @default(true)
+  is_skippable                  Boolean   @default(true)
   created_at                    DateTime  @default(now())
   created_by                    Int
   updated_at                    DateTime? @updatedAt

Backend/prisma/seed.js

@@ -299,6 +299,7 @@ async function main() {
         time_limit: 10,
         shuffle_questions: true,
         shuffle_choices: true,
+        is_skippable: true,
         created_by: instructor.id,
         questions: {
           create: [

Backend/src/services/ChaptersLesson.service.ts

@@ -1187,7 +1187,7 @@ export class ChaptersLessonService {
      */
     async updateQuiz(request: UpdateQuizInput): Promise<UpdateQuizResponse> {
         try {
-            const { token, course_id, lesson_id, title, description, passing_score, time_limit, shuffle_questions, shuffle_choices, show_answers_after_completion } = request;
+            const { token, course_id, lesson_id, title, description, passing_score, time_limit, shuffle_questions, shuffle_choices, show_answers_after_completion, is_skippable } = request;
             const decodedToken = jwt.verify(token, config.jwt.secret) as { id: number };
             await CoursesInstructorService.validateCourseStatus(course_id);
 
@@ -1217,6 +1217,7 @@ export class ChaptersLessonService {
             if (shuffle_questions !== undefined) updateData.shuffle_questions = shuffle_questions;
             if (shuffle_choices !== undefined) updateData.shuffle_choices = shuffle_choices;
             if (show_answers_after_completion !== undefined) updateData.show_answers_after_completion = show_answers_after_completion;
+            if (is_skippable !== undefined) updateData.is_skippable = is_skippable;
 
             // Update the quiz
             const updatedQuiz = await prisma.quiz.update({

Backend/src/services/CoursesStudent.service.ts

@@ -575,6 +575,7 @@ export class CoursesStudentService {
                         time_limit: lesson.quiz.time_limit,
                         shuffle_questions: lesson.quiz.shuffle_questions,
                         shuffle_choices: lesson.quiz.shuffle_choices,
+                        is_skippable: lesson.quiz.is_skippable,
                         questions: lesson.quiz.questions.map(q => ({
                             id: q.id,
                             question: q.question as { th: string; en: string },

Backend/src/types/ChaptersLesson.typs.ts

@@ -35,6 +35,7 @@ export interface QuizData {
     shuffle_questions: boolean;
     shuffle_choices: boolean;
     show_answers_after_completion: boolean;
+    is_skippable: boolean;
     created_at: Date;
     created_by: number;
     updated_at: Date | null;
@@ -570,6 +571,7 @@ export interface UpdateQuizInput {
     shuffle_questions?: boolean;
     shuffle_choices?: boolean;
     show_answers_after_completion?: boolean;
+    is_skippable?: boolean;
 }
 
 /**
@@ -650,4 +652,5 @@ export interface UpdateQuizBody {
     shuffle_questions?: boolean;
     shuffle_choices?: boolean;
     show_answers_after_completion?: boolean;
+    is_skippable?: boolean;
 }

Backend/src/types/CoursesStudent.types.ts

@@ -157,6 +157,7 @@ export interface LessonContentData {
         time_limit: number | null;
         shuffle_questions: boolean;
         shuffle_choices: boolean;
+        is_skippable: boolean;
         questions: {
             id: number;
             question: MultiLangText;