Автоматический ducker для интро/аутро подкаста

# 1) Request a presigned URL → returns { uploadUrl, storageKey }
curl -X POST 'https://api.elysiatools.com/api/upload/presign/audio-podcast-intro-outro-ducker' \
  -H 'Content-Type: application/json' \
  -d '{"filename":"voiceFile.ext","contentType":"application/octet-stream","size":12345}'
curl -X POST 'https://api.elysiatools.com/api/upload/presign/audio-podcast-intro-outro-ducker' \
  -H 'Content-Type: application/json' \
  -d '{"filename":"musicFile.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/ru/api/tools/audio-podcast-intro-outro-ducker' \
  -F 'voiceFile=uploads/2026/01/01/your-tool-1700000000000-abc123.ext' \
  -F 'musicFile=uploads/2026/01/01/your-tool-1700000000000-abc123.ext' \
  -F 'duckingMode=sidechain' \
  -F 'duckingDepth=-12' \
  -F 'attackMs=40' \
  -F 'releaseMs=300' \
  -F 'musicGain=-6' \
  -F 'musicStart=0' \
  -F 'musicEnd=0' \
  -F 'outputFormat=mp3'