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.

stop.sh

@@ -0,0 +1,28 @@
+#!/bin/bash
+# OCDP 一键停止脚本 (Docker Compose)
+
+set -e
+
+echo "=== OCDP 停止 ==="
+echo ""
+
+# 询问是否删除数据卷
+read -p "是否删除所有数据? (y/n): " -n 1 -r
+echo
+if [[ $REPLY =~ ^[Yy]$ ]]; then
+    echo "删除所有容器和数据卷..."
+    docker compose -f docker-compose.yml -f backend/docker-compose.yml down -v
+    echo ""
+    echo "⚠️  所有数据已删除"
+else
+    echo "停止所有容器（保留数据）..."
+    docker compose -f docker-compose.yml -f backend/docker-compose.yml down
+    echo ""
+    echo "数据已保留"
+fi
+
+echo ""
+echo "=== OCDP 停止完成 ==="
+echo ""
+echo "重新启动: ./start.sh"
+echo "完全清理: ./stop.sh  (选择 y 删除数据)"