[SEO]: Improve metadata, sitemap, and canonical governance

[cyclofan]

Target pages

Core public pages, especially:

• Home page
• Reaction Time Test
• Aim Trainer
• CPS Test
• Input Lag pages
• Sitemap and robots output

Improvement type

• Title / description
• JSON-LD
• Internal links
• sitemap / canonical / hreflang
• Content quality

Suggested change

ClickReflex already has SEO helpers, localized metadata, sitemap generation, and structured data, but the governance is spread across multiple files.

This issue tracks work to make SEO behavior easier to audit and maintain:

• Ensure canonical URLs, sitemap URLs, and hreflang alternates are consistent.
• Reduce manually maintained page lists where possible.
• Verify JSON-LD output for core test pages.
• Document how new test pages should define metadata and structured data.
• Avoid duplicate or deprecated URLs being indexed.

Expected impact

Better search engine crawl consistency, fewer duplicate URL risks, and easier long-term maintenance for SEO-focused pages.

References

Related docs:

• docs/ROADMAP.md
• docs/ARCHITECTURE.md