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

src/lib/redis-cache.ts

@@ -0,0 +1,53 @@
+import "server-only";
+
+import { redis } from "@/lib/redis";
+
+/**
+ * Cache the result of a fetch function in Redis.
+ * Falls back to the fresh fetch if Redis is unavailable.
+ */
+export async function redisCache<T>(
+	key: string,
+	ttlSeconds: number,
+	fetch: () => Promise<T>,
+): Promise<T> {
+	if (!redis) return fetch();
+
+	try {
+		const cached = await redis.get(key);
+		if (cached !== null) {
+			return JSON.parse(cached) as T;
+		}
+	} catch {
+		// cache miss or error — fall through to fresh fetch
+	}
+
+	const fresh = await fetch();
+
+	try {
+		await redis.setex(key, ttlSeconds, JSON.stringify(fresh));
+	} catch {
+		// ignore write errors
+	}
+
+	return fresh;
+}
+
+/**
+ * Invalidate a cached key. No-op if Redis is unavailable.
+ */
+export async function invalidateCache(key: string): Promise<void> {
+	if (!redis) return;
+	try {
+		await redis.del(key);
+	} catch {
+		// ignore
+	}
+}
+
+/**
+ * Build a namespaced cache key for API routes.
+ */
+export function apiCacheKey(path: string): string {
+	return `api:${path}`;
+}