curl 'https://app.memorylake.cn/openapi/memorylake/admin/v1/roles' \
  -H 'Authorization: Bearer sk-xxxxxx'

{
  "success": true,
  "message": "Operation completed successfully",
  "data": {
    "roles": [
      {
        "key": "tenant_owner",
        "label": "Owner",
        "built_in": true,
        "assignable": false,
        "admin_grant_only": false
      },
      {
        "key": "tenant_admin",
        "label": "Admin",
        "built_in": true,
        "assignable": true,
        "admin_grant_only": true
      },
      {
        "key": "tenant_member",
        "label": "Member",
        "built_in": true,
        "assignable": true,
        "admin_grant_only": false
      },
      {
        "key": "tenant_custom_a1b2c3d4",
        "label": "账单管理员",
        "description": "只读用量并导出账单",
        "built_in": false,
        "assignable": true,
        "admin_grant_only": false,
        "parent_role_key": "tenant_member"
      }
    ]
  }
}