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

next.config.ts

@@ -34,11 +34,11 @@ const securityHeaders = [
 ];
 
 const nextConfig: NextConfig = {
-	cacheComponents: true, // <-- Dit activeert Cache Components en lost de 'instant' build-fout op!
+	cacheComponents: true,
 	deploymentId: resolveDeploymentId(),
 	serverExternalPackages: ["lzma", "sharp", "pino", "pino-pretty"],
 
-	// Onderdruk de specifieke Turbopack waarschuwingen voor brede bestandspatronen in de lib-map
+	// Silence Turbopack warnings for the broad file patterns in src/lib.
 	turbopack: {
 		ignoreIssue: [
 			{
@@ -47,20 +47,19 @@ const nextConfig: NextConfig = {
 		],
 	},
 
-	// Voorkom dat type-warnings (zoals ongebruikte imports) de productiebuild blokkeren
 	typescript: {
 		ignoreBuildErrors: false,
 	},
 
-	// Compress responses with gzip/brotli
+	// Compress responses with gzip/brotli.
 	compress: true,
 
-	// Disable Next.js telemetry and browser sourcemaps in production
+	// Disable Next.js telemetry and browser sourcemaps in production.
 	productionBrowserSourceMaps: false,
 
 	experimental: {
 		useTypeScriptCli: true,
-		hideLogsAfterAbort: true, // <-- Dit verbergt de prerender bail-out logberichten!
+		hideLogsAfterAbort: true,
 	},
 
 	// Optimize images served through next/image with sharp → AVIF/WebP.