[Backend] -- Implement Request Validation Middleware

[Devsol-01]

Description

Add comprehensive request validation middleware using class-validator.

Tasks

• Create validation middleware
• Add DTOs for all endpoints
• Implement custom validators
• Add validation error formatting
• Test with invalid inputs
• Document validation rules

Acceptance Criteria

• All endpoints validated
• Clear error messages
• Custom validators work
• Documented

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[NnamdiCyber]

@NnamdiCyber has applied to work on this issue as part of the Stellar Wave Program's 5th wave.

I’d like to work on this issue because it contributes to improving the project's functionality, reliability, and overall user experience. I enjoy working on open-source projects and collaborating with maintainers to deliver clean, maintainable solutions.

I have experience with software development across frontend, backend, testing, and debugging tasks. I’m comfortable working with existing codebases, following project guidelines, writing tests, and ensuring changes are well-documented. I can investigate the current implementation, propose a clear solution, and deliver a high-quality contribution that meets the acceptance criteria.

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

[ositaemmanuel653-netizen]

@ositaemmanuel653-netizen has applied to work on this issue as part of the Stellar Wave Program's 5th wave.

Hello

please can i work on this issue

ℹ️ Repo Maintainers: To accept this application, review their application or assign @ositaemmanuel653-netizen to this issue.

[Babigdk]

@Babigdk has applied to work on this issue as part of the Stellar Wave Program's 5th wave.

Hi 👋, Kindly assign this issue to me.

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

[dee-john]

@dee-john has applied to work on this issue as part of the Stellar Wave Program's 5th wave.

Hi, I'd like to work on this issue! because I am very conversant with solving problems like this!

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

[mikevill20]

@mikevill20 has applied to work on this issue as part of the Stellar Wave Program's 5th wave.

Hello maintainer, please assign this issue to me. Thanks.

ℹ️ Repo Maintainers: To accept this application, review their application or assign @mikevill20 to this issue.

[ussyalfaks]

@ussyalfaks has applied to work on this issue as part of the Stellar Wave Program's 5th wave.

I would like to work on this issue

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

[drips-wave]

Congratulations, @ussyalfaks! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on June 2, 2026.

🧑‍💻 @ussyalfaks: 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.

Warning

When opening a PR, please link it to this issue to ensure it gets tracked accurately. Points are awarded when this issue is marked as completed by the maintainer.

🤠 Repo maintainers: Please keep an eye on the contributor's progress and review their work before the due date. You can manage this issue, including adjusting its complexity and points, here.

🌊 Happy Wave 🌊