curl --request POST \
  --url https://api.mixpeek.com/v1/namespaces/migrations/{migration_id}/start \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '{
  "force": false
}'

{
  "message": "Migration started successfully. Track progress at GET /migrations/{id}",
  "migration_id": "mig_abc123xyz789",
  "started_at": "2025-12-03T10:05:00Z",
  "status": "pending",
  "task_id": "task_xyz789"
}