Performance: RCON pooling, route caching, parallel status probe

Server:
- lib/cache.ts: tiny TTL memo for hot paths.
- lib/rcon.ts: pooled connection with 30s idle close and one-shot retry;
  was opening a fresh TCP per RCON call.
- /api/status: race protocol-ping + RCON with Promise.any (was sequential
  with 5s timeouts) and memo 3s; adds Cache-Control.
- /api/players: memo 10s, invalidated on mutations.
- /api/mods: getModDetails memo 10s (invalidated on install/remove) —
  eliminates per-request readdirSync/statSync/AdmZip parse.
- /api/analytics: reverse-scan JSONL to window cutoff (O(window) vs O(file))
  and memo 30s.
- /api/logs: memo 2s to throttle journalctl spawns during Live mode.

Client:
- StatusCard + ServerControls: staleTime 5s, both poll every 10s, dedup
  via shared query key.
- Analytics: staleTime 30s; memoize sparkline SVG paths.
- Modrinth search icons + mc-heads avatars: width/height + loading=lazy +
  decoding=async.
- next.config.ts: images.remotePatterns for future next/image migration,
  explicit compress=true.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

components/Analytics.tsx

@@ -1,7 +1,7 @@
 "use client";
 
 import { useQuery } from "@tanstack/react-query";
-import { useState } from "react";
+import { useMemo, useState } from "react";
 import { Skeleton } from "@/components/ui/skeleton";
 import {
   Card,
@@ -55,16 +55,17 @@ function Sparkline({
     );
   }
 
-  const dataMax = max || Math.max(...data, 1);
-  const w = 300;
-  const points = data.map((v, i) => {
-    const x = (i / (data.length - 1)) * w;
-    const y = height - (v / dataMax) * (height - 10) - 5;
-    return `${x},${y}`;
-  });
-
-  const pathD = `M${points.join(" L")}`;
-  const areaD = `${pathD} L${w},${height} L0,${height} Z`;
+  const { pathD, areaD, w } = useMemo(() => {
+    const dataMax = max || Math.max(...data, 1);
+    const width = 300;
+    const pts = data.map((v, i) => {
+      const x = (i / (data.length - 1)) * width;
+      const y = height - (v / dataMax) * (height - 10) - 5;
+      return `${x},${y}`;
+    });
+    const p = `M${pts.join(" L")}`;
+    return { pathD: p, areaD: `${p} L${width},${height} L0,${height} Z`, w: width };
+  }, [data, max, height]);
 
   return (
     <div className="rounded-lg bg-muted p-4">
@@ -99,6 +100,7 @@ export function Analytics() {
     queryFn: () =>
       fetch(`/api/analytics?hours=${hours}`).then((r) => r.json()),
     refetchInterval: 60_000,
+    staleTime: 30_000,
   });
 
   const latest = metrics.length > 0 ? metrics[metrics.length - 1] : null;