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/photos/route.ts

@@ -1,6 +1,7 @@
 import { count, desc } from "drizzle-orm";
 import { apiJson, pagination } from "@/lib/api";
 import { CameraWeb, db } from "@/lib/db";
+import { apiCacheKey, cacheSafe, redisCache } from "@/lib/redis-cache";
 
 /**
  * GET /api/photos — recent community photos (camera_web), newest first.
@@ -12,31 +13,40 @@ export async function GET(req: Request) {
 	const { page, perPage, skip, take } = pagination(sp);
 
 	try {
-		const [totalRows, photos] = await Promise.all([
-			db.select({ total: count() }).from(CameraWeb),
-			db
-				.select({
-					id: CameraWeb.id,
-					userId: CameraWeb.userId,
-					url: CameraWeb.url,
-					timestamp: CameraWeb.timestamp,
-				})
-				.from(CameraWeb)
-				.orderBy(desc(CameraWeb.timestamp))
-				.limit(take)
-				.offset(skip),
-		]);
-		const total = totalRows[0]?.total ?? 0;
-
-		return apiJson({
-			data: photos,
-			meta: {
-				page,
-				perPage,
-				total,
-				lastPage: Math.max(1, Math.ceil(total / perPage)),
+		const data = await redisCache(
+			apiCacheKey(`photos:${page}:${perPage}`),
+			60,
+			async () => {
+				const [totalRows, photos] = await Promise.all([
+					db.select({ total: count() }).from(CameraWeb),
+					db
+						.select({
+							id: CameraWeb.id,
+							userId: CameraWeb.userId,
+							url: CameraWeb.url,
+							timestamp: CameraWeb.timestamp,
+						})
+						.from(CameraWeb)
+						.orderBy(desc(CameraWeb.timestamp))
+						.limit(take)
+						.offset(skip),
+				]);
+				return cacheSafe({
+					data: photos,
+					meta: {
+						page,
+						perPage,
+						total: totalRows[0]?.total ?? 0,
+						lastPage: Math.max(
+							1,
+							Math.ceil((totalRows[0]?.total ?? 0) / perPage),
+						),
+					},
+				});
 			},
-		});
+		);
+
+		return apiJson(data);
 	} catch {
 		// DB unavailable — return an empty payload instead of a 500.
 		return apiJson(