feat(web): 添加拓扑图页面和相关组件

feat(csms): 添加获取当前连接状态的API
feat(csms): 添加获取当前活动OCPP WebSocket连接的接口
deps(web): 添加@xyflow/react依赖

apps/web/app/dashboard/topology/page.tsx

@@ -0,0 +1,12 @@
+import TopologyClient from "./topology-client";
+
+export default function TopologyPage() {
+  return (
+    // Break out of the dashboard's max-w-7xl / px padding by using
+    // a fixed overlay that covers exactly the main content area.
+    // left-0/lg:left-60 accounts for the sidebar width (w-60).
+    <div className="fixed inset-0 left-0 top-14 lg:left-60 lg:top-0">
+      <TopologyClient />
+    </div>
+  );
+}