feat(seo): implement SEO audit remediations

- Add dynamic sitemap.ts, robots.ts, and llms.txt route
- Add metadataBase and JSON-LD Organization schema to layout
- Set canonical alternates for all routes
- Migrate raw img tags to next/image for LCP optimization
- Add SEO dictionary strings to tr.json and en.json

app/[lang]/page.tsx

@@ -1,6 +1,18 @@
 import { getDictionary, Locale } from "../dictionaries";
 import HomeClient from "./HomeClient";
 
+export async function generateMetadata({ params }: { params: Promise<{ lang: Locale }> }) {
+  const { lang } = await params;
+  const dict = await getDictionary(lang);
+  return {
+    title: dict.seo.home.title,
+    description: dict.seo.home.description,
+    alternates: {
+      canonical: `/${lang}`,
+    },
+  };
+}
+
 export default async function Page({
   params,
 }: {
@@ -8,6 +20,5 @@ export default async function Page({
 }) {
   const { lang } = await params;
   const dict = await getDictionary(lang);
-
   return <HomeClient lang={lang} dict={dict.home} />;
 }