List and query cluster data
GET /api/clusters Authorization: Bearer TOKEN
[ { "id": "production", "name": "production", "provider": "EKS", "status": "connected", "region": "us-east-1", "cscScore": 87, "pods": 24, "nodes": 3, "risks": 2 } ]
GET /api/cluster?id=production Authorization: Bearer TOKEN
GET /api/cluster-slots Authorization: Bearer TOKEN
{ "used": 3, "max": 10, "plan": "professional" }