Get instance details

{
    "success": true,
    "instance": {
        "instance_id": "BRK-123456D",
        "name": "ml-training-server",
        "region": "FINLAND-1",
        "ssh_key_name": "my-ssh-key",
        "fixed_ip": "10.0.1.5",
        "floating_ip": "203.0.113.45",
        "status": "RUNNING",
        "specs": {
            "gpu_type": "H100-SXM5-80GB",
            "gpu_count": 4,
            "cpu": 32,
            "ram": 256
        },
        "image": {
            "name": "Ubuntu 22.04"
        },
        "created_at": "2025-01-15T10:30:00Z",
        "currency": "USD",
        "operations": {
            "security_rules": true,
            "snapshot": true,
            "is_snapshotting": false,
            "hibernation": true,
            "restore_hibernation": true,
            "reboot": true
        },
        "volume_attachments": [
            {
                "name": "os-volume",
                "volume_id": "BRK-123456V",
                "volume_type": "SSD",
                "status": "ATTACHED",
                "created_at": "2025-01-15T10:30:00Z",
                "size": 100,
                "bootable": true
            }
        ],
        "security_rules": [
            {
                "id": 12345,
                "protocol": "tcp",
                "port_range_min": 22,
                "port_range_max": 22,
                "direction": "ingress",
                "ethertype": "IPv4",
                "remote_ip_prefix": "0.0.0.0/0"
            }
        ]
    }
}