XLSX Data Validation Dropdown

# 1) Request a presigned URL → returns { uploadUrl, storageKey }
curl -X POST 'https://api.elysiatools.com/api/upload/presign/xlsx-data-validation-dropdown' \
  -H 'Content-Type: application/json' \
  -d '{"filename":"workbookFile.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/xlsx-data-validation-dropdown' \
  -F 'workbookFile=uploads/2026/01/01/your-tool-1700000000000-abc123.ext' \
  -F 'rulesJson=[
  {
    "type": "list",
    "sheetName": "Input",
    "target": "B2:B50",
    "values": [
      "Open",
      "Pending",
      "Closed"
    ],
    "promptTitle": "Status",
    "prompt": "Choose a workflow status"
  },
  {
    "type": "cascade",
    "sheetName": "Input",
    "parentTarget": "C2:C50",
    "childTarget": "D2:D50",
    "mapping": {
      "Hardware": [
        "Laptop",
        "Monitor",
        "Keyboard"
      ],
      "Software": [
        "CRM",
        "ERP",
        "Analytics"
      ]
    },
    "parentPromptTitle": "Category",
    "parentPrompt": "Choose a category first",
    "childPromptTitle": "Item",
    "childPrompt": "Then choose an item"
  }
]'