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/i18n/messages/en.json

@@ -464,5 +464,13 @@
       "description": "Pay via bank transfer",
       "comingSoon": "Coming soon"
     }
+  },
+  "NotFound": {
+    "title": "Page Not Found",
+    "description": "The page you're looking for doesn't exist or has been moved.",
+    "browseProducts": "Browse Products",
+    "goHome": "Go Home",
+    "lookingFor": "Can't find what you're looking for?",
+    "searchSuggestion": "Try browsing our product collection or contact us for assistance."
   }
 }