列出批处理任务

curl -X GET "https://api.tokenlab.sh/v1/batches?limit=20" \
  -H "Authorization: Bearer sk-your-api-key"

{
  "object": "list",
  "data": [{ "id": "batch_abc123", "object": "batch", "status": "completed" }],
  "first_id": "batch_abc123",
  "last_id": "batch_abc123",
  "has_more": false
}