forked from mirror/crumbs-original
- FEATURES.md: document client-side optimization, thumbnails, offline support, SW caching - ARCHITECTURE.md: add attachment data flow section (client → optimize → IDB/server → SW cache) - openapi.yaml: add &thumb=1 query param, thumbnail FormData field, thumbnailPath in Attachment schema, attachments array in Note schema Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>