Implement `GET /campaigns/:id/donations` endpoint

[ayshadogo]

User Story:
As a visitor, I want to see a campaign's donation history so that I can view the donor leaderboard.
Acceptance Criteria:

• Returns paginated donations list (20 per page)
• Anonymous donations show wallet as "Anonymous"
• Sorted by amount descending by default
• Includes: rank, walletAddress, amount, assetCode, createdAt, txHash

---

[neyij]

@neyij has applied to work on this issue as part of the Stellar Wave Program's 5th wave.

hi, i would like to work on this.

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

[MerlinTheWhiz]

@MerlinTheWhiz has applied to work on this issue as part of the Stellar Wave Program's 5th wave.

Let me handle this. Please assign

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

[dDevAhmed]

@dDevAhmed has applied to work on this issue as part of the Stellar Wave Program's 5th wave.

I'd like to work on this issue

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

[drips-wave]

Congratulations, @dDevAhmed! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on June 2, 2026.

🧑‍💻 @dDevAhmed: 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.

Warning

When opening a PR, please link it to this issue to ensure it gets tracked accurately. Points are awarded when this issue is marked as completed by the maintainer.

🤠 Repo maintainers: Please keep an eye on the contributor's progress and review their work before the due date. You can manage this issue, including adjusting its complexity and points, here.

🌊 Happy Wave 🌊