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/adapter/output/oci/mock/oci_client_mock.go

@@ -262,12 +262,40 @@ func (c *OCIClientMock) GetValuesSchema(ctx context.Context, registry *entity.Re
 	return mockSchema, nil
 }
 
+func (c *OCIClientMock) GetValues(ctx context.Context, registry *entity.Registry, repository, reference string) (string, error) {
+	artifact, err := c.GetArtifact(ctx, registry, repository, reference)
+	if err != nil {
+		return "", err
+	}
+
+	if !artifact.IsChart() {
+		return "", fmt.Errorf("not a helm chart")
+	}
+
+	// 返回 Mock values.yaml
+	mockValues := `# Default values for the chart
+replicaCount: 1
+
+image:
+  repository: nginx
+  tag: latest
+  pullPolicy: IfNotPresent
+
+service:
+  type: ClusterIP
+  port: 80
+
+resources: {}
+`
+	return mockValues, nil
+}
+
 func (c *OCIClientMock) PullArtifact(ctx context.Context, registry *entity.Registry, repository, reference, destPath string) error {
 	_, err := c.GetArtifact(ctx, registry, repository, reference)
 	if err != nil {
 		return err
 	}
-	
+
 	// Mock 实现，不实际下载
 	return nil
 }