Add photo search with Boolean operators

- Server-side search index built from all album.json files + people.json,
  cached in memory for 5 minutes.  Each photo document includes filename,
  album path words, title, caption, camera, date parts (year/month-name/
  full date), and person names.
- Recursive-descent Boolean parser: AND (explicit or implicit between
  consecutive terms), OR, NOT, with standard precedence.
- GET /search?q=... returns a photo grid (max 300 results) linking each
  photo back to its album lightbox.
- Search box added to the site header; hidden on mobile.
- Results show filename, date, person names, and album path per photo.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

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