feat: enable React Compiler, add Redis caching for API routes, update README with requirements and install guide

src/app/api/radio/config/route.ts

@@ -1,5 +1,6 @@
 import { apiJson } from "@/lib/api";
 import { prisma } from "@/lib/prisma";
+import { redisCache, apiCacheKey } from "@/lib/redis-cache";
 
 // Radio player config: the subset of radio_* website_settings the front-end
 // player needs (stream URL, name, autoplay, enabled, widget visibility) as a
@@ -27,19 +28,23 @@ const CONFIG_KEYS = new Set([
 
 export async function GET(_req: Request) {
 	try {
-		const rows = await prisma.websiteSetting.findMany({
-			where: { key: { in: Array.from(CONFIG_KEYS) } },
-			select: { key: true, value: true },
-		});
-
-		const config: Record<string, string> = {};
-		for (const row of rows) {
-			config[row.key] = row.value;
-		}
-
+		const config = await redisCache(
+			apiCacheKey("radio:config"),
+			30,
+			async () => {
+				const rows = await prisma.websiteSetting.findMany({
+					where: { key: { in: Array.from(CONFIG_KEYS) } },
+					select: { key: true, value: true },
+				});
+				const result: Record<string, string> = {};
+				for (const row of rows) {
+					result[row.key] = row.value;
+				}
+				return result;
+			},
+		);
 		return apiJson(config);
 	} catch {
-		// DB unavailable — serve an empty config rather than a 500.
 		return apiJson({}, { status: 200 });
 	}
 }