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/api/teams/route.ts

@@ -1,23 +1,28 @@
 import { asc, eq } from "drizzle-orm";
 import { apiJson } from "@/lib/api";
 import { db, WebsiteTeams } from "@/lib/db";
+import { apiCacheKey, cacheSafe, redisCache } from "@/lib/redis-cache";
 
 // Public REST API — website teams (staff ranks). Mirrors src/app/staff/page.tsx:
 // visible ranks (hiddenRank=false) ordered by id.
 
 export async function GET(_req: Request) {
 	try {
-		const rows = await db
-			.select({
-				id: WebsiteTeams.id,
-				rankName: WebsiteTeams.rankName,
-				badge: WebsiteTeams.badge,
-				jobDescription: WebsiteTeams.jobDescription,
-				staffColor: WebsiteTeams.staffColor,
-			})
-			.from(WebsiteTeams)
-			.where(eq(WebsiteTeams.hiddenRank, false))
-			.orderBy(asc(WebsiteTeams.id));
+		const rows = await redisCache(apiCacheKey("teams"), 300, async () =>
+			cacheSafe(
+				await db
+					.select({
+						id: WebsiteTeams.id,
+						rankName: WebsiteTeams.rankName,
+						badge: WebsiteTeams.badge,
+						jobDescription: WebsiteTeams.jobDescription,
+						staffColor: WebsiteTeams.staffColor,
+					})
+					.from(WebsiteTeams)
+					.where(eq(WebsiteTeams.hiddenRank, false))
+					.orderBy(asc(WebsiteTeams.id)),
+			),
+		);
 
 		// apiJson serialises BigInt ids → string automatically.
 		return apiJson({ data: rows }, { status: 200 });