feat(performance): add ISR and Cloudflare cache headers

- Add revalidate=3600 to homepage and products page (1hr ISR)
- Add middleware to set cache headers for HTML pages
- Bypass cache for checkout and cart pages

src/app/[locale]/page.tsx

@@ -16,6 +16,8 @@ import { getPageKeywords, getBrandKeywords } from "@/lib/seo/keywords";
 import { Metadata } from "next";
 import Image from "next/image";
 
+export const revalidate = 3600;
+
 const baseUrl = process.env.NEXT_PUBLIC_SITE_URL || "https://manoonoils.com";
 
 export async function generateMetadata({ params }: { params: Promise<{ locale: string }> }): Promise<Metadata> {

src/app/[locale]/products/page.tsx

@@ -9,6 +9,8 @@ import { isValidLocale, DEFAULT_LOCALE, getSaleorLocale, type Locale } from "@/l
 import { getPageKeywords } from "@/lib/seo/keywords";
 import { Metadata } from "next";
 
+export const revalidate = 3600;
+
 const baseUrl = process.env.NEXT_PUBLIC_SITE_URL || "https://manoonoils.com";
 
 interface ProductsPageProps {

src/middleware.ts

@@ -0,0 +1,35 @@
+import { NextResponse } from "next/server";
+import type { NextRequest } from "next/server";
+
+export function middleware(request: NextRequest) {
+  const response = NextResponse.next();
+
+  const url = request.nextUrl.pathname;
+
+  if (
+    url.startsWith("/sr") ||
+    url.startsWith("/en") ||
+    url.startsWith("/de") ||
+    url.startsWith("/fr") ||
+    url === "/"
+  ) {
+    if (
+      !url.includes("/checkout") &&
+      !url.includes("/cart") &&
+      !url.includes("/api/")
+    ) {
+      response.headers.set(
+        "Cache-Control",
+        "public, max-age=3600, stale-while-revalidate=86400"
+      );
+    }
+  }
+
+  return response;
+}
+
+export const config = {
+  matcher: [
+    "/((?!_next/static|_next/image|favicon.ico|icon.png|robots.txt|sitemap.xml).*)",
+  ],
+};