Load testing script with k6 for core endpoints

[greatest0fallt1me]

Description

Add scripts/k6/stream-api.js (or TS) and README instructions for load testing /health and stream list.

Requirements and context

• Baseline RPS goals documented.
• No secrets in script.

Suggested execution

• Fork the repository and create a branch (example below).
• Implement changes in StreamPay-Backend (TypeScript / Express per package.json).
• Keep the service secure, tested, and documented; prefer small, reviewable PRs.

git checkout -b test/k6-load-backend

Implementation targets

• scripts/k6/ under backend.
• Example env for host URL.

Tests and validation

• Document how to interpret results.

• Run npm test and npm run lint in StreamPay-Backend.

• Cover edge cases; include test output and brief security notes in the PR description.

Guidelines

• Target minimum 95% test coverage on new or changed backend code (or justify gaps).
• Clear documentation (OpenAPI / README / inline docs as specified).
• Timeframe: 96 hours from assignment.

Example commit message

test(backend): k6 load test script for API

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