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/audit_log_repository.go

@@ -0,0 +1,27 @@
+package repository
+
+import (
+	"context"
+	"github.com/ocdp/cluster-service/internal/domain/entity"
+)
+
+// AuditLogRepository 审计日志仓储接口
+type AuditLogRepository interface {
+	// Create 创建审计日志
+	Create(ctx context.Context, log *entity.AuditLog) error
+
+	// GetByWorkspace 获取 workspace 的审计日志
+	GetByWorkspace(ctx context.Context, workspaceID string, limit int) ([]*entity.AuditLog, error)
+
+	// GetByUser 获取用户的审计日志
+	GetByUser(ctx context.Context, userID string, limit int) ([]*entity.AuditLog, error)
+
+	// GetByResource 获取资源的审计日志
+	GetByResource(ctx context.Context, resourceType entity.AuditResourceType, resourceID string, limit int) ([]*entity.AuditLog, error)
+
+	// List 列出审计日志（分页）
+	List(ctx context.Context, limit, offset int) ([]*entity.AuditLog, error)
+
+	// DeleteByWorkspace 删除 workspace 的审计日志
+	DeleteByWorkspace(ctx context.Context, workspaceID string) error
+}