feat: implement gallery page with category filtering and lightbox functionality

app/gallery/page.tsx

@@ -0,0 +1,12 @@
+import { GalleryContent } from "@/components/gallery-content";
+import { GALLERY_ITEMS } from "@/data/gallery";
+import type { Metadata } from "next";
+
+export const metadata: Metadata = {
+  title: "Galeri",
+  description: "Poyraz Avsever'in tasarımları, projeleri ve görsel içeriklerinden oluşan galeri portföyü.",
+};
+
+export default function GalleryPage() {
+  return <GalleryContent items={GALLERY_ITEMS} />;
+}