[S3] Implement GET /users/me to return the authenticated user's profile

[Akshola00]

Description

Return the profile of the currently authenticated wallet.

Deliverables

• Requires JWT auth
• GET /users/me looks up user by publicKey from JWT payload
• Returns the User object (id, publicKey, displayName, createdAt)
• Returns 404 if user record doesn't exist yet (should not happen if auto-create is in place)
• npm run build passes

Notes

Depends on #12 (StellarAuthGuard), #31 (users migration), and #34 (auto-create user).

[SpacePanda7077]

@SpacePanda7077 has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

Hey maintainer, I’ll be happy to handle this issue

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[otobongdev]

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

Good day, I will love to work on this issue

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[Ceejaytech25]

@Ceejaytech25 has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

GM GM Maintainer, pls can I work on this issue ? ETA - 12hrs

ℹ️ Repo Maintainers: To accept this application, review their application or assign @Ceejaytech25 to this issue.

[drips-wave]

Congratulations, @Ceejaytech25! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on June 30, 2026.

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