feat(frontend): add Helm chart browser, monitoring, chart-references and values templates pages

Add new frontend pages for the multi-tenant OCDP platform:

- Charts page (/charts): Browse Harbor OCI registries to list Helm chart repositories
  and versions, with deploy modal to launch charts on selected clusters
- Monitoring page (/monitoring): Display cluster metrics (CPU/Memory/GPU usage)
  and per-node details with resource utilization bars
- Chart References page (/chart-references): CRUD for chart metadata references
- Values Templates page (/templates): CRUD for Helm values templates with version
  history and rollback support
- Sidebar: Add Charts navigation, update Storage and Templates links
- api.ts: Add all API client functions (clusterApi, registryApi, instanceApi,
  monitoringApi, storageApi, chartReferenceApi, valuesTemplateApi,
  workspaceApi, userApi) with full TypeScript types

Note: deploy flow and values template rollback not yet end-to-end tested.

backend/internal/domain/repository/user_repository.go

@@ -9,20 +9,26 @@ import (
 type UserRepository interface {
 	// Create 创建用户
 	Create(ctx context.Context, user *entity.User) error
-	
+
 	// GetByID 根据 ID 获取用户
 	GetByID(ctx context.Context, id string) (*entity.User, error)
-	
+
 	// GetByUsername 根据用户名获取用户
 	GetByUsername(ctx context.Context, username string) (*entity.User, error)
-	
+
 	// Update 更新用户
 	Update(ctx context.Context, user *entity.User) error
-	
+
 	// Delete 删除用户
 	Delete(ctx context.Context, id string) error
-	
+
 	// List 列出所有用户
 	List(ctx context.Context) ([]*entity.User, error)
+
+	// ListByWorkspace 列出指定 workspace 的用户
+	ListByWorkspace(ctx context.Context, workspaceID string) ([]*entity.User, error)
+
+	// ListActive 仅列出活跃用户
+	ListActive(ctx context.Context) ([]*entity.User, error)
 }