fix: fix frontend build errors

frontend/src/routes/index.tsx

@@ -2,9 +2,8 @@ import { ServerStats } from "@/components/server_stats";
 import { Card } from "@/components/ui/card";
 import type { Metrics } from "@/models/metrics";
 import type { MinimalServers } from "@/models/minimal_servers";
-import { useQueries, useQuery } from "@tanstack/react-query";
+import { useQuery } from "@tanstack/react-query";
 import { createFileRoute } from "@tanstack/react-router";
-import { useEffect, useState } from "react";
 
 export const Route = createFileRoute("/")({
   component: App,