Implement Update Offering API (Startup, Partial Update)

[thlpkee20-wq]

Description
Implement PATCH /api/offerings/:id (or PUT) for the issuer to update offering fields (e.g. name, description, status). Enforce that only the issuer can update.

Requirements and context

• Implement only in new files or by extending offerings route/service. Use offering repository update and updateStatus. Do not modify package.json, src/index.ts, or DB client. Require JWT; verify req.user matches offering.issuer_user_id. Return 200 with updated offering or 403/404.
• Support partial payload (only send fields to update).

Suggested execution

• Branch: git checkout -b feature/update-offering-api
• Add PATCH handler; validate body; check ownership; call repository update; return offering.
• Add tests for success, forbidden, not found, validation.

Test and commit

• Run tests. Example commit message: feat(api): add update offering endpoint

Guidelines

• Additive route/service only. Timeframe: 96 hours.

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[spartan124]

@spartan124 has applied to work on this issue as part of the Stellar Wave Program's 2nd wave.

Pls assign the task to me, i am good at creating CRUD APIs and understand the importance of idempotency.

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Congratulations, @spartan124! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on February 26, 2026.

🧑‍💻 @spartan124: 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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