curl --request GET \
  --url https://api.ai2fin.com/api/category-sets/active \
  --header 'Authorization: Bearer <token>'

{
  "success": true,
  "set": {
    "id": "<string>",
    "name": "Business Expenses",
    "description": "All business-related expense categories",
    "color": "#3B82F6",
    "icon": "Briefcase",
    "userId": "<string>",
    "isDefault": true,
    "isActive": true,
    "categoryCount": 123,
    "categories": [
      {
        "id": "<string>",
        "name": "<string>",
        "icon": "<string>",
        "color": "<string>",
        "isTaxDeductible": true,
        "taxCategory": "<string>",
        "defaultGstRate": 123
      }
    ],
    "createdAt": "2023-11-07T05:31:56Z",
    "updatedAt": "2023-11-07T05:31:56Z"
  }
}