Add performance optimizations and component refactors

- Cache read-heavy public API routes via redisCache (leaderboard, values,
  shop, articles, photos, guilds, teams, staff, users, home, radio, badges)
- Add single-flight and bounded-memory cache layer with unit tests
- Parallelize independent DB queries on search, rares, shop, staff, polls
  and profile pages
- Push radio points leaderboard aggregation to SQL with a LIMIT
- Split studio-client and import-furni-client into focused modules
- Clean up next.config.ts

src/components/admin/studio/studio-furni-icons.ts

@@ -0,0 +1,40 @@
+import type { SyntheticEvent } from "react";
+
+import type { FurniItem } from "./studio-types";
+
+export function getFurniImageUrl(item: FurniItem) {
+	if (item.iconUrl) return item.iconUrl;
+	const base = item.classname.includes("*")
+		? item.classname.substring(0, item.classname.indexOf("*"))
+		: item.classname;
+	return `https://images.habbo.com/dcr/hof_furni/${item.revision}/${encodeURIComponent(base)}_icon.png`;
+}
+
+export function getFurniIconUrl(classname: string, revision: number) {
+	const iconName = classname.replace(/\*/g, "_");
+	return `https://images.habbo.com/dcr/hof_furni/${revision}/${encodeURIComponent(iconName)}_icon.png`;
+}
+
+export function handleImgError(
+	e: SyntheticEvent<HTMLImageElement>,
+	item: FurniItem,
+) {
+	const img = e.target as HTMLImageElement;
+	const iconName = item.classname.replace(/\*/g, "_");
+	if (!img.dataset.fallback) {
+		img.dataset.fallback = "1";
+		img.src = getFurniIconUrl(item.classname, item.revision);
+	} else if (img.dataset.fallback === "1") {
+		img.dataset.fallback = "2";
+		img.src = `/swf/dcr/hof_furni/icons/${encodeURIComponent(iconName)}_icon.png`;
+	} else {
+		img.style.opacity = "0.3";
+		img.src =
+			'data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" width="48" height="48" viewBox="0 0 24 24" fill="none" stroke="%23666" stroke-width="1.5"><rect x="3" y="3" width="18" height="18" rx="2"/><circle cx="8.5" cy="8.5" r="1.5"/><path d="m21 15-5-5L5 21"/></svg>';
+	}
+}
+
+export const TYPE_LABELS: Record<string, string> = {
+	flooritem: "Floor",
+	wallitem: "Wall",
+};