spb/tendril

feat(api): serve interactive playground + docs platform at /

Self-contained landing page served via @fastify/static (apps/api/public):
- hero with Tendril identity (botanical/terminal theme, animated vine SVG)
- live playground: scrape/map/status, formats & options, latency, rendered
  markdown preview, links/metadata/structured tabs, curl/python/js snippets
  with copy, live /v1/status pill
- collapsible API reference with param tables + examples, §15 error table
Explicit API routes keep priority over the static wildcard.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

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