fix(404): add redirects for broken URLs and custom not-found page

- Add permanent redirects for /products/manoon to /products
- Strip malformed /contact suffix from product URLs
- Create custom branded 404 page with product navigation
- Add NotFound translations for en and sr locales

src/app/[locale]/not-found.tsx

@@ -0,0 +1,68 @@
+"use client";
+
+import { useTranslations, useLocale } from "next-intl";
+import Header from "@/components/layout/Header";
+import Footer from "@/components/layout/Footer";
+import Link from "next/link";
+import { Home, Search, Package } from "lucide-react";
+
+export default function NotFoundPage() {
+  const t = useTranslations("NotFound");
+  const locale = useLocale();
+  const basePath = `/${locale}`;
+
+  return (
+    <>
+      <Header locale={locale} />
+      <main className="min-h-screen bg-white">
+        <div className="pt-[180px] lg:pt-[200px] pb-20 px-4">
+          <div className="max-w-2xl mx-auto text-center">
+            {/* 404 Code */}
+            <div className="text-[120px] lg:text-[180px] font-light text-black/5 leading-none select-none mb-4">
+              404
+            </div>
+            
+            <h1 className="text-2xl lg:text-3xl font-medium mb-4">
+              {t("title")}
+            </h1>
+            <p className="text-[#666666] mb-10 max-w-md mx-auto">
+              {t("description")}
+            </p>
+
+            {/* Quick Links */}
+            <div className="flex flex-col sm:flex-row items-center justify-center gap-4 mb-12">
+              <Link
+                href={`${basePath}/products`}
+                className="flex items-center gap-2 px-6 py-3 bg-black text-white text-sm uppercase tracking-[0.1em] hover:bg-[#333333] transition-colors w-full sm:w-auto justify-center"
+              >
+                <Package className="w-4 h-4" />
+                {t("browseProducts")}
+              </Link>
+              <Link
+                href={basePath}
+                className="flex items-center gap-2 px-6 py-3 border border-black text-black text-sm uppercase tracking-[0.1em] hover:bg-black hover:text-white transition-colors w-full sm:w-auto justify-center"
+              >
+                <Home className="w-4 h-4" />
+                {t("goHome")}
+              </Link>
+            </div>
+
+            {/* Search Suggestion */}
+            <div className="p-6 bg-[#f8f8f8] rounded-sm">
+              <div className="flex items-center gap-3 mb-3 text-[#666666]">
+                <Search className="w-5 h-5" />
+                <span className="text-sm font-medium uppercase tracking-[0.1em]">
+                  {t("lookingFor")}
+                </span>
+              </div>
+              <p className="text-sm text-[#666666]">
+                {t("searchSuggestion")}
+              </p>
+            </div>
+          </div>
+        </div>
+      </main>
+      <Footer locale={locale} />
+    </>
+  );
+}