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/pagination.tsx

@@ -0,0 +1,89 @@
+"use client";
+
+import type { ReactNode } from "react";
+
+import { Button } from "@/components/ui/button";
+import type { Meta } from "./import-furni-types";
+
+export function Pagination({
+	meta,
+	loading,
+	onPageChange,
+}: {
+	meta: Meta | null;
+	loading: boolean;
+	onPageChange: (page: number) => void;
+}) {
+	if (!meta || meta.lastPage <= 1) return null;
+	const nodes: ReactNode[] = [];
+	if (meta.currentPage > 1) {
+		nodes.push(
+			<Button
+				key="prev"
+				variant="ghost"
+				size="sm"
+				onClick={() => onPageChange(meta.currentPage - 1)}
+				disabled={loading}
+				className="text-xs"
+			>
+				&larr; Prev
+			</Button>,
+		);
+	}
+	for (let p = 1; p <= meta.lastPage; p++) {
+		if (p === meta.currentPage) {
+			nodes.push(
+				<Button
+					key={p}
+					variant="default"
+					size="sm"
+					className="text-xs min-w-[32px]"
+				>
+					{p}
+				</Button>,
+			);
+		} else if (
+			Math.abs(p - meta.currentPage) <= 2 ||
+			p === 1 ||
+			p === meta.lastPage
+		) {
+			nodes.push(
+				<Button
+					key={p}
+					variant="ghost"
+					size="sm"
+					onClick={() => onPageChange(p)}
+					disabled={loading}
+					className="text-xs min-w-[32px]"
+				>
+					{p}
+				</Button>,
+			);
+		} else if (Math.abs(p - meta.currentPage) === 3) {
+			nodes.push(
+				<span key={`dots-${p}`} className="text-muted-foreground text-xs px-1">
+					&hellip;
+				</span>,
+			);
+		}
+	}
+	if (meta.currentPage < meta.lastPage) {
+		nodes.push(
+			<Button
+				key="next"
+				variant="ghost"
+				size="sm"
+				onClick={() => onPageChange(meta.currentPage + 1)}
+				disabled={loading}
+				className="text-xs"
+			>
+				Next &rarr;
+			</Button>,
+		);
+	}
+	return (
+		<div className="flex items-center justify-center gap-1 mt-4 flex-wrap">
+			{nodes}
+		</div>
+	);
+}