fix(admin-web): 引荐关系树节点点击跳转到用户详情页

之前点击只切换树根节点，不导航。改为 router.push 跳转。

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

frontend/admin-web/src/app/(dashboard)/users/[id]/page.tsx

@@ -236,10 +236,10 @@ export default function UserDetailPage() {
     }
   }, [activeTab, accountSequence, contractsPage]);
 
-  // 切换推荐关系树的根节点
+  // 点击节点跳转到该用户详情页
   const handleTreeNodeClick = useCallback((node: ReferralNode) => {
-    setTreeRootUser(node.accountSequence);
-  }, []);
+    router.push(`/users/${node.accountSequence}`);
+  }, [router]);
 
   // 展开/收起节点的下级
   const handleToggleNode = useCallback(async (nodeSeq: string, hasChildren: boolean) => {