Remove server-side TLS listener support so Fabro only binds plain TCP
or Unix sockets, and update docs/tests around proxy-terminated HTTPS.
This also drops the removed [server.listen.tls] config shape and the
inbound TLS-specific diagnostics, fixtures, and integration coverage.
Add three new pages under a "Using the API" group in the API Reference
tab: API Overview (base URL, authentication, errors, pagination,
versioning), Demo Mode, and Client SDKs. Nest "Run Internals" as an
expandable sub-group under "Run Outputs" in the nav.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
