Moves llms.txt, robots.txt, auth.md, .well-known/api-catalog, agent-skills,
webmcp.js from VPS /var/www/signal-demo to signal-ui/public/ so they are
served from the Vercel deployment at signal.sttilsolutions.com.
Co-Authored-By: Claude Sonnet 4.6 (1M context) <noreply@anthropic.com>
