Add integration tests

[AHarmlessPyro]

Summary

Add integration tests

Validation

yarn test:integration

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Note

Low Risk
Low risk: adds tests and a new GitHub Actions workflow without changing runtime/library behavior.

Overview
Adds a new tests/integration suite that spins up a local HTTP server to verify HyperbrowserClient.scrape.start/getStatus hit the configured baseUrl, send expected headers/body, and parse JSON responses.

Wires integration tests into tooling by adding yarn test:integration, expanding vitest.config.ts includes, and introducing a dedicated Integration Tests GitHub Actions workflow that builds the package and runs yarn test:integration.

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[devin-ai-integration]

✅ Devin Review: No Issues Found

Devin Review analyzed this PR and found no potential bugs to report.

View in Devin Review to see 2 additional findings.