Validate request payloads using Zod on public routes

[robertocarlous]

Body:

Some controllers assume well-formed input. Add Zod schemas for key endpoints and middleware to validate inputs, returning 400 with a consistent error payload for malformed requests.

Acceptance Criteria:

• Zod schemas exist for major public endpoints (auth, deposit, withdraw, webhook).
• Invalid payloads return 400 with a descriptive error body.
• Tests cover validation failures and success cases.

[dotunv]

I am interested in this issue

[grantfox-oss]

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Next steps:

1. Open a Pull Request referencing this issue (e.g., Closes #146)
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[BernardOnuh]

@BernardOnuh has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

I've checked the requirements and am confident I can resolve this efficiently. Happy to take it on.

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

[TomikeDS]

@TomikeDS has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

Can i solve this?

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[drips-wave]

Congratulations, @TomikeDS! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on June 30, 2026.

🧑‍💻 @TomikeDS: 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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[grantfox-oss]

🦊 GrantFox — @TomikeDS has been assigned to this issue as part of the Official Campaign campaign!

Next steps:

1. Open a Pull Request referencing this issue (e.g., Closes #146)
2. Your PR will be reviewed by the Neurowealth maintainers

Good luck! Track your progress on GrantFox.