feat(courses): Add quiz/assessment system

[zeemscript]

Description:
Implement a quiz system with multiple choice questions for course modules. Track learner scores and require passing grade to mark lessons complete. This ensures learners understand the material.

Acceptance Criteria:

• Create quiz questions with multiple choice answers
• Support multiple quizzes per course/module
• Track quiz attempts and scores
• Require minimum passing score to proceed
• Display quiz results and correct answers after submission

Files to modify/create:

• src/models/quiz.model.ts - Quiz and question schema
• src/models/quiz-attempt.model.ts - User quiz attempts
• src/services/quiz.service.ts - Quiz logic and scoring
• src/controllers/quiz.controller.ts - Quiz endpoints

[Gadflyxx]

@Gadflyxx has applied to work on this issue as part of the Stellar Wave Program's 8th wave.

hello maintainer, i would love to work on this issue

ℹ️ Repo Maintainers: To accept this application, review their application or assign @Gadflyxx to this issue.

[drips-wave]

Congratulations, @Gadflyxx! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on August 31, 2026.

🧑‍💻 @Gadflyxx: Please resolve the issue such that the repo's maintainers have enough time to review your contribution before the due date. You'll earn Points for completing the issue on-time, which will make you eligible for a share of the Stellar Wave Program's reward pool.

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🌊 Happy Wave 🌊

[bubah911]

@bubah911 has applied to work on this issue as part of the Stellar Wave Program's 8th wave.

Would love to contribute here. I’ll take a look and work on a clean fix

ℹ️ Repo Maintainers: To accept this application, review their application or assign @bubah911 to this issue.

[bolajigate-cell]

@bolajigate-cell has applied to work on this issue as part of the Stellar Wave Program's 8th wave.

Hello, this task matches my skills and I’m confident I can resolve it properly. Kindly assign it to me.

ℹ️ Repo Maintainers: To accept this application, review their application or assign @bolajigate-cell to this issue.

[official-rex]

@official-rex has applied to work on this issue as part of the Stellar Wave Program's 8th wave.

I’d like to work on this issue. I can implement the quiz system, scoring, attempts tracking, passing requirements, and quiz endpoints with the required models and tests.

ℹ️ Repo Maintainers: To accept this application, review their application or assign @official-rex to this issue.

[kuse-design]

@kuse-design has applied to work on this issue as part of the Stellar Wave Program's 8th wave.

i would like to work on this issue because am a software engineer and am capable of completing this task effectively.

ℹ️ Repo Maintainers: To accept this application, review their application or assign @kuse-design to this issue.

[barnabasolutayo-lgtm]

@barnabasolutayo-lgtm has applied to work on this issue as part of the Stellar Wave Program's 8th wave.

Please Maintainer. Assign this issue to me. I've only been assigned 2 issues so far

ℹ️ Repo Maintainers: To accept this application, review their application or assign @barnabasolutayo-lgtm to this issue.

[Oluwasuyi-Oluwatimilehin-Daniel]

@Oluwasuyi-Oluwatimilehin-Daniel has applied to work on this issue as part of the Stellar Wave Program's 8th wave.

Hello @maintainer, I’d like to work on this issue. I have experience handling similar tasks and can start immediately. And I will deliver at the shortest possible time.

ℹ️ Repo Maintainers: To accept this application, review their application or assign @Oluwasuyi-Oluwatimilehin-Daniel to this issue.

[doncross03]

@doncross03 has applied to work on this issue as part of the Stellar Wave Program's 8th wave.

Hi Maintainer, I understand the problem and already have an approach in mind for resolving it. I'm ready to start immediately and would be grateful if you could assign the issue to me.

ℹ️ Repo Maintainers: To accept this application, review their application or assign @doncross03 to this issue.