[BE-36] Implement forgot password and reset password endpoints

[yusuftomilola]

Overview

Implement password reset flow with email-based token delivery inside backend/contrib/.

Location

All work must be inside backend/contrib/src/auth/ and backend/contrib/src/mail/.

Acceptance Criteria

• POST /auth/forgot-password — accepts { email }, generates a short-lived token (15 min), stores hashed token in DB, sends email with reset link via nodemailer
• POST /auth/reset-password — accepts { token, newPassword }, validates token, updates password, invalidates token
• PasswordResetToken entity: id, userId, tokenHash, expiresAt, usedAt
• MailModule and MailService created using nodemailer
• Environment variables used: MAIL_HOST, MAIL_PORT, MAIL_USER, MAIL_PASS, MAIL_FROM

[OmniZlatoon]

@OmniZlatoon has applied to work on this issue as part of the Stellar Wave Program's 4th wave.

I would like to work on this project. I assure you completion and efficiency in the outcome of this work.

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[RUKAYAT-CODER]

@RUKAYAT-CODER has applied to work on this issue as part of the Stellar Wave Program's 4th wave.

Hi am a full stack developer, i will like to work on this task

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

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Congratulations, @RUKAYAT-CODER! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on April 29, 2026.

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[drips-wave]

This issue has been completed by @RUKAYAT-CODER as part of the Stellar Wave Program's 4th Wave 🥳

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