Fix: Convert authentication request payload to camelCase for backend

[FrankOHara43]

Description

Updated the authentication module to use camelCase property names in the token request payload to match the backend API's requirements.

Changes

• Modified auth.js to use tokenExpire (camelCase) instead of token_expire (snake_case) when constructing the token request body.
• Updated auth.test.js test assertions to verify the corrected camelCase property names in the token payload.

How to test

It occurs everytime you try to set up the project and run it locally.

[FrankOHara43]

@GMishx please take a look.