curl -X POST https://api.migma.ai/v1/contacts/bulk-delete \
  -H "Authorization: Bearer $MIGMA_API_KEY" \
  -H "Content-Type: application/json" \
  -H "Idempotency-Key: contacts-delete-batch-1" \
  -d '{
    "emails": ["john@example.com", "jane@example.com"],
    "projectId": "PROJECT_ID"
  }'

{
  "success": true,
  "data": {
    "deleted": 123,
    "notFound": [
      "<string>"
    ]
  },
  "error": "<string>"
}