refactor: full-stack restructure with multi-tenancy, workspace management, and K8s diagnostics

- Add Workspace domain (entity, repository, service, handler, DTO)
- Add multi-tenant K8s client with tenant binding and quota management
- Add K8s diagnostics client (instance diagnostics)
- Add authorization middleware (authz package)
- Restructure frontend to feature-based architecture (features/)
- Add User Management page in configuration
- Add AccessDenied page and route guards
- Refactor shared components (form inputs, layout, UI)
- Update Tailwind config for new design system
- Add comprehensive documentation (docs/, tasks/, plans)
- Improve cluster service with better kubeconfig handling
- Add tests for crypto, config, helm client, tenant binding

backend/internal/domain/repository/helm_client.go

@@ -9,26 +9,25 @@ import (
 type HelmClient interface {
 	// Install 安装 Helm Chart
 	Install(ctx context.Context, cluster *entity.Cluster, instance *entity.Instance) error
-	
+
 	// Upgrade 升级 Helm Release
 	Upgrade(ctx context.Context, cluster *entity.Cluster, instance *entity.Instance) error
-	
+
 	// Uninstall 卸载 Helm Release
 	Uninstall(ctx context.Context, cluster *entity.Cluster, releaseName, namespace string) error
-	
+
 	// Rollback 回滚 Helm Release
 	Rollback(ctx context.Context, cluster *entity.Cluster, releaseName, namespace string, revision int) error
-	
+
 	// GetStatus 获取 Release 状态
 	GetStatus(ctx context.Context, cluster *entity.Cluster, releaseName, namespace string) (*entity.Instance, error)
-	
+
 	// GetHistory 获取 Release 历史
 	GetHistory(ctx context.Context, cluster *entity.Cluster, releaseName, namespace string) ([]*entity.ReleaseHistory, error)
-	
+
 	// List 列出集群中的所有 Releases
 	List(ctx context.Context, cluster *entity.Cluster, namespace string) ([]*entity.Instance, error)
-	
+
 	// GetValues 获取 Release 的 values
 	GetValues(ctx context.Context, cluster *entity.Cluster, releaseName, namespace string) (map[string]interface{}, error)
 }
-