Generate docs/openapi.json (3.1, 362 operations) from the API inventory via
scripts/gen_openapi.py, and serve it with a self-hosted Redoc bundle at
/api/docs - no CDN, works on the air-gapped box. Also serve docs/llms.txt (a
concise LLM entrypoint) at /api/docs/llms.txt. New core 'docs' blueprint;
staticdocs/ excluded from the naming check (vendored minified JS).
