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/entity/registry.go

@@ -7,24 +7,30 @@ import (
 // Registry OCI Registry 领域实体
 type Registry struct {
 	ID          string
+	WorkspaceID string // 所属 workspace，NULL 表示全局共享
+	OwnerID     string // 创建者用户 ID
 	Name        string
 	URL         string
 	Description string
 	Username    string
 	Password    string
-	Insecure    bool // 是否跳过 TLS 验证
+	Insecure    bool   // 是否跳过 TLS 验证
+	IsShared    bool   // 是否为共享 Registry（admin 创建供多 workspace 使用）
 	CreatedAt   time.Time
 	UpdatedAt   time.Time
 }
 
 // NewRegistry 创建新 Registry
-func NewRegistry(name, url string) *Registry {
+func NewRegistry(workspaceID, ownerID, name, url string) *Registry {
 	now := time.Now()
 	return &Registry{
-		Name:      name,
-		URL:       url,
-		CreatedAt: now,
-		UpdatedAt: now,
+		WorkspaceID: workspaceID,
+		OwnerID:     ownerID,
+		Name:        name,
+		URL:         url,
+		IsShared:    false,
+		CreatedAt:   now,
+		UpdatedAt:   now,
 	}
 }