#8: Prepare link42.app for GitHub Pages

[wan0net]

Summary

• replace the Node adapter with strict domain-root static prerendering
• verify every public route, RSS, 404 page, asset, and locally vendored font in the Pages artifact
• add an immutable, least-privilege Pages build/deploy workflow for protected main
• keep Pages settings, custom-domain APIs, DNS, DigitalOcean, production, and Rule1 out of scope

Verification

• pnpm verify
• 44 Node tests and 40 Vitest tests
• 52 Playwright/Axe passes with 12 intentional project skips
• 21 HTML routes, RSS, 61 linked targets, 7 excluded routes, 72 static files
• full-history and tree Gitleaks clean

No CNAME file or repository/domain setting change is included.