Implement Request Validation Middleware

[llinsss]

Description:
Add comprehensive request validation for all endpoints.

Tasks:

• Create validation schemas for all endpoints
• Add validation middleware
• Return detailed validation errors
• Add validation tests

Files to modify:

• backend/schemas/*.js
• backend/middleware/validation.js

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[Adedayo-Data]

@Adedayo-Data has applied to work on this issue as part of the Stellar Wave Program's 2nd wave.

I'd like to be assigned to this issue. I will implement a robust validation layer using Joi or Zod to create schemas for all backend endpoints. I'll develop the middleware in backend/middleware/validation.js to intercept requests and return structured, detailed error responses (400 Bad Request) for any schema mismatches. I'll also include comprehensive integration tests to ensure all edge cases are covered. Ready to start immediately.

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

[drips-wave]

Congratulations, @Adedayo-Data! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on February 26, 2026.

🧑‍💻 @Adedayo-Data: 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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This issue has been completed by @Adedayo-Data as part of the Stellar Wave Program's 2nd Wave 🥳

😎 @Adedayo-Data: You earned 200 Points for completing this issue! After the current Wave ends, you'll be eligible for a percentage of the Wave's reward pool based on the percentage of total points you've earned. Learn more here. You can also Leave a review to share your experience working on this issue.

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