Regenerate GraphQL types for optional S3 photo description (#32)

The backend now defaults a photo's description to "" for S3 uploads
instead of requiring it, which was rejecting every device upload with
"description: can't be blank". This syncs the committed types to that
schema so the client sends the now-valid {type, storageKey} input.

Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: dfalling