Add API Load Testing Workflow

[Abd-Standard]

Description:
Introduce a repeatable load-testing workflow for critical NotifyChain API endpoints.

Acceptance Criteria:

Test scenarios are documented.
Requests per second and latency can be measured.
Results can be compared across changes.

[sheyman546]

@sheyman546 has applied to work on this issue as part of the Stellar Wave Program's 9th wave.

please i will love love to work on these issue

ℹ️ Repo Maintainers: To accept this application, review their application or assign @sheyman546 to this issue.

[drips-wave]

Congratulations, @sheyman546! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on September 30, 2026.

🧑‍💻 @sheyman546: 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.

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