feat: add babel.config.js and update plugin versions in package.json and package-lock.json

Author: whiteSHADOW1234

frontend/babel.config.js

@@ -0,0 +1,4 @@
+plugins: [
+    require('@babel/plugin-proposal-private-property-in-object').default,
+    require('@babel/plugin-proposal-private-methods').default
+];

frontend/package-lock.json

@@ -48,7 +48,7 @@
     "@babel/core": "^7.22.5",
     "@babel/eslint-parser": "7.22.5",
     "@babel/plugin-proposal-private-property-in-object": "7.21.11",
-    "@babel/plugin-transform-private-property-in-object": "^7.23.4",
+    "@babel/plugin-transform-private-property-in-object": "^7.25.9",
     "@babel/plugin-transform-runtime": "^7.25.9",
     "@babel/preset-env": "^7.26.0",
     "@babel/preset-flow": "^7.25.9",