feat: add hreflang tags and international sitemap for SEO

- Added hreflang alternates to root layout for all locales (sr, en, de, fr)
- Added hreflang alternates to [locale] layout for all locales
- Updated sitemap to include all locale variants for every page
- Google will now properly index all language versions

src/app/layout.tsx

@@ -2,6 +2,8 @@ import "./globals.css";
 import type { Metadata, Viewport } from "next";
 import ErrorBoundary from "@/components/providers/ErrorBoundary";
 
+const baseUrl = process.env.NEXT_PUBLIC_SITE_URL || "https://dev.manoonoils.com";
+
 export const metadata: Metadata = {
   title: {
     default: "ManoonOils - Premium Natural Oils for Hair & Skin",
@@ -9,6 +11,15 @@ export const metadata: Metadata = {
   },
   description: "Discover our premium collection of natural oils for hair and skin care.",
   robots: "index, follow",
+  alternates: {
+    canonical: baseUrl,
+    languages: {
+      sr: baseUrl,
+      en: `${baseUrl}/en`,
+      de: `${baseUrl}/de`,
+      fr: `${baseUrl}/fr`,
+    },
+  },
   openGraph: {
     title: "ManoonOils - Premium Natural Oils for Hair & Skin",
     description: "Discover our premium collection of natural oils for hair and skin care.",