Age-like Encrypted File Bundle

# 1) Request a presigned URL → returns { uploadUrl, storageKey }
curl -X POST 'https://api.elysiatools.com/api/upload/presign/age-like-encrypted-file-bundle' \
  -H 'Content-Type: application/json' \
  -d '{"filename":"sourceFile.ext","contentType":"application/octet-stream","size":12345}'
curl -X POST 'https://api.elysiatools.com/api/upload/presign/age-like-encrypted-file-bundle' \
  -H 'Content-Type: application/json' \
  -d '{"filename":"bundleFile.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/age-like-encrypted-file-bundle' \
  -F 'operation=encrypt' \
  -F 'sourceFile=uploads/2026/01/01/your-tool-1700000000000-abc123.ext' \
  -F 'bundleFile=uploads/2026/01/01/your-tool-1700000000000-abc123.ext' \
  -F 'passphrase=correct horse battery staple' \
  -F 'strength=moderate' \
  -F 'includeSignature=false' \
  -F 'signerId=Optional signer label, e.g. ops-key-1' \
  -F 'signerPrivateKey=Optional base64 Ed25519 secret key. Leave blank to auto-generate when signing.' \
  -F 'signerPublicKey=Optional base64 Ed25519 public key for signature verification during decrypt'