Batch Image Trim

# 1) Request a presigned URL → returns { uploadUrl, storageKey }
curl -X POST 'https://api.elysiatools.com/api/upload/presign/batch-image-trim' \
  -H 'Content-Type: application/json' \
  -d '{"filename":"imageFiles.ext","contentType":"application/octet-stream","size":12345}'

# 2) PUT the file bytes directly to the presigned uploadUrl
curl -X PUT '<presigned uploadUrl>' \
  --data-binary @/path/to/file.ext

# 3) Call the tool, passing the returned storageKey for each file field
curl -X POST 'https://api.elysiatools.com/en/api/tools/batch-image-trim' \
  -F 'imageFiles=uploads/2026/01/01/your-tool-1700000000000-abc123.ext' \
  -F 'trimMethod=auto' \
  -F 'backgroundColor=Color to trim (for color method)' \
  -F 'autoDetectBackground=true' \
  -F 'tolerance=40' \
  -F 'sensitivity=240' \
  -F 'format=original' \
  -F 'quality=90' \
  -F 'preserveMetadata=false' \
  -F 'outputAsZip=true' \
  -F 'keepOriginalNames=true'