[CayPlayProjects]

WebCheck 0.6.0

This draft PR extends the passive website diagnostics tool while keeping main unchanged.

Added

• Configurable, bounded same-origin page crawler (depth 1–3, max 5–30 pages).
• Robots.txt and sitemap-aware page discovery; no external-domain crawling or automatic redirect following.
• Per-page HTTP, title and SEO warning summaries; blocked pages are separated from confirmed HTTP errors.
• Optional Google PageSpeed Insights / Lighthouse report with mobile/desktop strategy, category scores, lab metrics and opportunities.
• Browser-local history of the latest eight reports.
• Report comparison for overall score, category scores, changed checks and broken-page count.
• Bilingual UI, updated project documentation and standalone ZIP artifact.

Safety and privacy

• Existing passive-only diagnostics, URL validation, DNS/IP filtering, request limits, rate limiting and concurrency limits remain in place.
• Crawler uses only public unauthenticated pages and respects robots.txt.
• Lighthouse is opt-in; when enabled, the page URL is sent to Google PageSpeed Insights.
• Scan history stays in local browser storage and is not uploaded to the WebCheck server.

Validation

• Node.js 18, 20 and 22 CI matrix.
• Syntax checks pass.
• 38 automated tests pass.
• Standalone archive is generated from the CI build.

This PR intentionally remains a draft and is not merged into main.