List rate limits

{
  "data": [
    {
      "id": "rl_abc123",
      "projectId": "proj_xyz",
      "name": "Customer API limit",
      "dimensionFilters": {
        "customer_id": "cust_123"
      },
      "limitValue": 100,
      "window": "1h",
      "enabled": true,
      "createdAt": "2024-01-15T10:30:00Z",
      "updatedAt": "2024-01-15T10:30:00Z"
    }
  ],
  "nextCursor": "rl_xyz789",
  "hasMore": true
}

{
  "error": "Invalid request"
}

{
  "error": "Invalid or missing API key"
}