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/(site)/rankings/page.tsx

@@ -9,6 +9,7 @@ import {
 } from "@/components/public/ui";
 import { CurrencyIcon } from "@/components/shared/currency-icon";
 import { UserAvatarThumbnail } from "@/components/shared/user-avatar-thumbnail";
+import { cached } from "@/lib/cache";
 import { db, User } from "@/lib/db";
 
 export const metadata = { title: "Rankings" };
@@ -25,17 +26,19 @@ export default async function RankingsPage() {
 	const t = await getTranslations("pages.rankings");
 	let users: TopUser[] = [];
 	try {
-		users = await db
-			.select({
-				username: User.username,
-				look: User.look,
-				credits: User.credits,
-				rank: User.rank,
-				online: User.online,
-			})
-			.from(User)
-			.orderBy(desc(User.credits))
-			.limit(12);
+		users = await cached("rankings:top", 60_000, async () =>
+			db
+				.select({
+					username: User.username,
+					look: User.look,
+					credits: User.credits,
+					rank: User.rank,
+					online: User.online,
+				})
+				.from(User)
+				.orderBy(desc(User.credits))
+				.limit(12),
+		);
 	} catch {
 		users = [];
 	}