Add a step to a workflow section

curl -X POST 'https://api.expiryedge.com/v1/createWorkflowStep' \
  -H "Authorization: Bearer $EXPIRYEDGE_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
  "section_id": "sec_5Hn2",
  "workflow_id": "wf_3Kd9Tx",
  "title": "Collect CE certificates",
  "assignees": [
    "u_71bXq"
  ],
  "priority": "high",
  "due_date": "2026-10-15"
}'

{
  "message": "Step created successfully",
  "step_id": "stp_9Qm1",
  "step": {
    "id": "stp_9Qm1",
    "section_id": "sec_5Hn2",
    "workflow_id": "wf_3Kd9Tx",
    "title": "Collect CE certificates",
    "description": "Gather continuing education certificates from each dentist.",
    "assignees": [
      "u_71bXq"
    ],
    "status": "todo",
    "priority": "high",
    "start_date": null,
    "due_date": null,
    "due_offset_days": 7,
    "completed_at": null,
    "order": 0,
    "dependencies": [],
    "time_estimate": 0,
    "time_spent": 0,
    "tags": [],
    "linked_expiry_id": null,
    "created_at": "2026-09-27T14:05:00.000Z"
  }
}