chore(deps): bump react-router from 7.15.1 to 8.1.0 in /frontend (#970)

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frontend/package.json

@@ -34,7 +34,7 @@
     "react-hook-form": "^7.81.0",
     "react-i18next": "^17.0.8",
     "react-markdown": "^10.1.0",
-    "react-router": "^7.14.0",
+    "react-router": "^8.1.0",
     "sonner": "^2.0.7",
     "tailwind-merge": "^3.5.0",
     "tailwindcss": "^4.3.2",