Backend - Add commitments overview aggregates endpoint for dashboard KPIs

[1nonlypiece]

Description

Add GET /api/commitments/overview?ownerAddress=... returning aggregates (counts, totals, average compliance, fees, violations) for dashboard KPI cards.

Requirements and context

• Must be secure, tested, and documented
• Must require auth for ownerAddress

Suggested execution

• Implement aggregator (reuse analytics code where possible)
• Add docs and tests

Test and commit

• Add tests for empty and non-empty datasets

Example commit message

feat: add commitments overview aggregates endpoint for dashboard

Guidelines

• Minimum 95 percent test coverage
• Timeframe: 72 hours

[Agatha00133]

@Agatha00133 has applied to work on this issue as part of the Stellar Wave Program's 4th wave.

i would love to work on this issue

ℹ️ Repo Maintainers: To accept this application, review their application or assign @Agatha00133 to this issue.

[drips-wave]

Congratulations, @Agatha00133! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on April 29, 2026.

🧑‍💻 @Agatha00133: 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 🌊