Update frontend dependencies to align with compatibility requirements

This commit downgrades the `@vitejs/plugin-vue` dependency from version 6.0.0 to 5.2.1 and the `vite` dependency from version 7.2.2 to 5.4.21 in the frontend package.json. These changes ensure compatibility with the current project setup and address potential issues arising from newer versions.

frontend/package.json

@@ -23,12 +23,12 @@
     "vuex": "^4.1.0"
   },
   "devDependencies": {
-    "@vitejs/plugin-vue": "^6.0.0",
+    "@vitejs/plugin-vue": "^5.2.1",
     "eslint": "^9.39.1",
     "eslint-plugin-vue": "^9.0.0",
     "sass": "^1.77.8",
     "sass-loader": "^14.2.1",
-    "vite": "^7.2.2"
+    "vite": "^5.4.21"
   },
   "eslintConfig": {
     "root": true,