Create UI - Change VUE_APP_ to VITE_ Cleanup

The Vue-CLI to Vite migration guide recommends changing environment variable names.

As it stands, the environment variables have a prefix of `VUE_APP_` instead of `VITE_`. This was achieved by adding a prefix change in the `vite.config.js` file. Usually, `import.meta.env` only works with the VITE_ prefix. It is advised when working with Vite, to change everything to VITE_ (from Migration guides).

That won't work currently since there are some Devops code related to vaults. This ticket might need Patrick's help with some configs.

Need to handle:
- [ ] Change VUE_APP_ to VITE_ and make the necessary changes with it.

Start with vite.config.js and the Vue-CLI to Vite migration guidance to identify the current VUE_APP_ prefix handling. Then trace the DevOps vault-related configuration mentioned in the issue before changing the names to VITE_. Done means the frontend and related vault configurations use the new prefix without breaking environment-variable access.

Written by the indexing model from the issue text.