Revert "Add missing admin action files and navigation links"

This reverts commit 41be6835bf.

src/app/admin/media/page.tsx

@@ -16,13 +16,7 @@ export default async function AdminMediaPage() {
           <h1 className="m-0 text-xl font-extrabold text-[var(--color-text)]">{t("title")}</h1>
           <p className="m-0 text-xs text-[var(--color-text-muted)] mt-0.5">{t("subtitle")}</p>
         </div>
-        <Link
-          href="/admin/articles"
-          className="text-sm text-gray-500 dark:text-gray-400"
-          style={{ fontSize: "0.88rem" }}
-        >
-          ← {t("articles")}
-        </Link>
+        <Link href="/admin/articles" className="text-sm text-gray-500 dark:text-gray-400" style={{ fontSize: "0.88rem" }}>← {t("articles")}</Link>
       </div>
       <AdminMediaGrid />
     </main>