logan
b80d383b28
重构 InstanceGroup 权限组系统，从细粒度 20+ 权限开关简化为 3 种类型模式。 改动: - InstanceGroup 模型新增 access_type (readonly/datachange/ddl) 和 allowed_databases 字段 - 保留旧 permissions 字段以兼容已有数据 - Schema 新增 access_type 和 allowed_databases 字段 - API endpoint 更新 create/update 处理逻辑 - 新增 role_permissions.py 服务，提供角色权限查询 Refactor InstanceGroup permission system from 20+ fine-grained permission switches to a simplified 3-type access model (readonly/datachange/ddl). Changes: - Add access_type and allowed_databases columns to InstanceGroup model - Keep legacy permissions field for backward compatibility - Update schemas with new fields - Update API endpoint create/update logic - Add role_permissions.py service with role-based permission queries