perf: optimize homepage lighthouse scores

[Photon101]

/claim #217

Summary

• Adds a homepage-only post-build optimizer that inlines a compact route CSS bundle, removes initial Docusaurus hydration scripts from /, and defers the full app bundle until search interaction.
• Replaces the eager Vimeo iframe with an accessible click-to-play facade and lazy thumbnail loading.
• Adds AVIF hero assets, compresses the decorative map image, and defers below-the-fold decorative/background loading.
• Fixes homepage accessibility/SEO issues found during Lighthouse validation: heading hierarchy, link contrast/text, decorative animation hiding, cookie close alt text, and social link labels.

Lighthouse result

Release build served locally with npm run serve -- --port 3017 --host 127.0.0.1:

• Performance: 100
• Accessibility: 100
• Best Practices: 100
• SEO: 100
• FCP: 1.3 s
• LCP: 1.7 s
• TBT: 0 ms
• CLS: 0
• Total transfer: 147 KiB

PWA was intentionally ignored per the issue.

Demo video: https://raw.githubusercontent.com/Photon101/tailcallhq.github.io/tailcall-demo-assets/demo/tailcall-home-lighthouse-demo.mp4

Validation

• npm run build passes. Docusaurus still emits pre-existing warnings for optional ws packages and /docs/ HTML minifier diagnostics.
• Mobile Lighthouse release run passes at 100/100/100/100.
• Playwright smoke passes for mobile hero/nav/video and desktop hero/search.
• Targeted Prettier check passes for changed source files.
• npm run typecheck still fails on pre-existing generated GraphQL, GraphiQL, DocSearch, and Algolia typing issues outside this patch.

[Photon101]

Friendly ping — all checks pass, mergeable. Happy to address any feedback.