feat: automate llms.txt and developers/docs/llms.txt generation

[pettinarip]

Summary

• Replace hand-maintained public/llms.txt with two force-static App Router routes that regenerate on every deploy from the existing nav files + content frontmatter.
• Add ethereum.org/developers/docs/llms.txt as a docs-focused index (Next.js root-vs-docs split); root /llms.txt cross-links to it instead of inlining the deep docs tree.
• Document the rendering strategy in docs/solutions/architecture/llms-txt-automation.md.

Links

• https://deploy-preview-18234.ethereum.it/llms.txt
• https://deploy-preview-18234.ethereum.it/developers/docs/llms.txt

Test plan

• Open https://deploy-preview-<N>--ethereumorg.netlify.app/llms.txt and confirm sections mirror main nav (Learn / Use / Build / Participate / Research) + Legal & Policies, with ### More buckets for Footer-only items.
• Open /developers/docs/llms.txt and confirm the full developer-docs sidebar renders as nested bullets.
• Confirm the cross-link from the root file points at /developers/docs/llms.txt.
• Confirm the Footer still renders identically on the homepage (its link data was extracted to a shared footerLinks.ts module).
• Verify pretty URLs throughout (no /content/*/index.md links).

[netlify]

✅ Deploy Preview for ethereumorg ready!

Name	Link
🔨 Latest commit	b2bddf3
🔍 Latest deploy log	https://app.netlify.com/projects/ethereumorg/deploys/6a170d033062ca00088323a2
😎 Deploy Preview	https://deploy-preview-18234.ethereum.it
📱 Preview on mobile	Toggle QR Code... Use your smartphone camera to open QR code link.
Lighthouse	7 paths audited Performance: 71 (🟢 up 6 from production) Accessibility: 96 (no change from production) Best Practices: 100 (no change from production) SEO: 98 (🔴 down 1 from production) PWA: 59 (no change from production) View the detailed breakdown and full score reports

---

To edit notification comments on pull requests, go to your Netlify project configuration.

[pettinarip]

🤖 Heads up — this branch now conflicts with dev in src/components/Footer/index.tsx.

The conflict itself is mechanical (PR extracted the footer links into buildFooterLinkSections(t)/buildFooterDipperLinks(t); dev still edited the inline arrays), but there's a non-obvious catch: dev (commit 6d7409e "add /reports page under Research menu") changed the Research section, and that change did not make it into the extracted src/lib/nav/footerLinks.ts.

To resolve, take the PR's builder-function call site, then port dev's change into the Research links array in src/lib/nav/footerLinks.ts:

• add { href: "/reports/", text: t("reports") }
• change /trillion-dollar-security/ → /reports/trillion-dollar-security/

Leaving this for a human since it touches src/lib/ and the fix lives in a file that isn't even part of the conflict (easy to silently drop).

[pettinarip]

✅ Resolved the dev conflict and pushed b2bddf3.

• Took the PR's builder-function call site in Footer/index.tsx.
• Ported dev's Research-menu change into src/lib/nav/footerLinks.ts: added { href: "/reports/", text: t("reports") } and re-homed trillion-dollar-security under /reports/trillion-dollar-security/.

Local eslint clean on both touched files; reports translation key confirmed present. Netlify will rebuild the preview.