Thumbnails (256px JPEG, q80) generated on first request and cached at
/data/thumbs/<shard>/<file_id>.jpg — i.e. on the workstation's local SSD,
not the NAS. Subsequent requests serve straight from cache, never
re-fetching from /photos.
HEIC/HEIF decoded via pillow-heif so iPhone photos finally render.
Videos cached as a single ffmpeg-extracted frame, not regenerated each
request. New DELETE /api/thumb/cache endpoint to wipe it.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
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