[server] - Create Load Testing Suite with k6 for API Stress Testing

[dark-sarge]

Location: tests/load/

Description

AirFlex has no load testing. Before launch, the server must be stress-tested to find throughput limits, identify slow database queries under concurrency, and validate that the rate limiting configuration behaves correctly under load.

Acceptance Criteria

• k6 load test scripts are created in tests/load/ for the following scenarios: marketplace listing page (100 virtual users, 5-minute sustained), OTP request burst (50 virtual users, 1 minute), trade creation (20 virtual users, 3 minutes).
• Each script asserts p95 response time < 500 ms and error rate < 1%.
• A pnpm load:test script runs all k6 scripts against LOAD_TEST_BASE_URL env variable.
• A load-test.yml GitHub Actions workflow runs the load tests on-demand (manual trigger) against the staging environment.
• k6 results are exported as JSON and parsed into a summary Markdown table posted as a PR comment by the workflow.
• Results from each load test run are stored as workflow artifacts for historical trend comparison.

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[oniololade60-coder]

@oniololade60-coder has applied to work on this issue as part of the Stellar Wave Program's 8th wave.

Hello Maintainer, I’ve reviewed the issue thoroughly and have a good understanding of what is required. I’m confident I can work on it effectively and deliver a solution that meets the expected criteria. I’d appreciate the opportunity to take it on.

ℹ️ Repo Maintainers: To accept this application, review their application or assign @oniololade60-coder to this issue.

[Chi-nenye1975]

@Chi-nenye1975 has applied to work on this issue as part of the Stellar Wave Program's 8th wave.

Hello Maintainer, I'd love to work on this issue

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[richardgittest]

@richardgittest has applied to work on this issue as part of the Stellar Wave Program's 8th wave.

Hi, I would love to work on this.

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[Shekez]

@Shekez has applied to work on this issue as part of the Stellar Wave Program's 8th wave.

I’d like to work on this issue because I’m interested in API performance and load testing. I can help build k6 tests to identify bottlenecks, measure performance under stress, and improve API reliability.

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

[EbukaMoses]

@EbukaMoses has applied to work on this issue as part of the Stellar Wave Program's 8th wave.

Hello Maintainer,

I’d like to apply to work on this issue.

I’m Ebuka Moses, a full-stack and blockchain developer with experience building, testing, and maintaining smart contracts, particularly using Rust and blockchain-based architectures. I’m comfortable working with contract logic, validation, access control, persistent storage, and event handling, and I always pay close attention to correctness, security, and edge cases.

I take time to fully understand the issue requirements before implementing a solution, and I ensure my work follows the project’s coding standards. I also write clear, well-tested code and submit clean pull requests with meaningful commits.

I’m confident I can deliver a solid solution that meets the acceptance criteria and adds value to the project.

Thank you for your consideration, and I look forward to contributing.

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