fix(seo): add meta description, robots.txt and raise lighthouse thresholds

[tehw0lf]

Summary

• Add meta description to index.html (was causing SEO audit failure)
• Add public/robots.txt with User-agent: * / Allow: / (SPA fallback was serving HTML at /robots.txt)
• Raise lighthouse thresholds: min_accessibility 95→100, min_seo 80→100 (current scores: a11y 100%, seo 82% — robots.txt + meta description fix should bring SEO to 100%)

Test plan

• Lighthouse CI runs green with new thresholds after deploy
• /robots.txt returns valid content (not HTML)
• SEO score reaches 100%

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 20b1bfa8-e488-4815-9ea2-599adc526d79

📥 Commits

Reviewing files that changed from the base of the PR and between 088a332 and 476b962.

⛔ Files ignored due to path filters (1)

• package-lock.json is excluded by !**/package-lock.json

📒 Files selected for processing (5)

• .github/workflows/lighthouse-scan.yml
• index.html
• package.json
• public/robots.txt
• vite.config.ts

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/seo-robots-meta-thresholds

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