docs search: local plugin, enriched library, tests, UX
## Full-text search for docs (#63)
Install @easyops-cn/docusaurus-search-local — client-side Lunr
search that indexes all 450+ doc pages at build time.
## Fix broken /api link (#65)
Create docs/docs/api/index.md, fix intro.md, onBrokenLinks=throw.
## Enriched library data (#64, #66)
Full abstracts, creators/authors, Dockerfile pydantic fix.
## Library search UX (#68)
200ms debounce, URL state, Cmd+K shortcut.
## Integration tests (#67)
9 new tests: export, fields, truncation, tags, links, API docs.
fix #63, fix #64, fix #65, fix #66, fix #67, fix #68
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