POST /v1/files/upload

curl -X POST https://api.vonative.com/v1/files/upload \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -F "file=@document.pdf"

{
  "success": true,
  "data": {
    "id": "file-uuid-1234",
    "name": "document.pdf",
    "size_bytes": 245000,
    "status": "processing"
  }
}