Add llms.txt and llms-full.txt links in the footer with
"AI-friendly docs" label. Also add link rel="llms-txt" head tag
for automatic discovery by AI tools.
Rewrites all documentation with accurate project details (Fastify, port
1349, single-container Docker, all 33+ tools, full database schema).
Adds getting started guide and configuration reference. Updates help and
settings dialogs to link to the docs site.