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/app/admin/import/furni/import-furni-icons.ts

@@ -0,0 +1,45 @@
+import type { SyntheticEvent } from "react";
+
+export function getFurniImageUrl(classname: string, revision: number) {
+	// Use official Habbo CDN for furniture icons
+	const base = classname.includes("*")
+		? classname.substring(0, classname.indexOf("*"))
+		: classname;
+	return `https://images.habbo.com/dcr/hof_furni/${revision}/${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>,
+	classname: string,
+	revision: number,
+) {
+	const img = e.target as HTMLImageElement;
+	const iconName = classname.replace(/\*/g, "_");
+	if (!img.dataset.fallback) {
+		img.dataset.fallback = "1";
+		img.src = getFurniIconUrl(classname, revision);
+	} else if (img.dataset.fallback === "1") {
+		img.dataset.fallback = "2";
+		img.src = `/swf/dcr/hof_furni/icons/${encodeURIComponent(iconName)}_icon.png`;
+	} else {
+		// Show placeholder instead of invisible image
+		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 STATUS_LABELS: Record<string, string> = {
+	pending: "Pending",
+	started: "Starting",
+	downloading: "Downloading",
+	converting: "Converting",
+	writing_db: "Writing DB",
+	done: "Done",
+	failed: "Failed",
+};