[Backend] Check Login page

[filipe-varela]

As mentioned in the Issue #1, it will be needed a backend logic to handle the fenix login and afterwards the connection between the session and the HSInventory database/API.

For that, this issue can run independently from its frotend correspondent, since it needs to retrieve the necessary information to build the frotend, when needed, and to keep the data for future sessions and requests.

To ensure everything works as fine, it is necessary to create unit tests for the functions that rearrange the data to call and generate the important information for the best work in the app. In case that the CI is not working, leave this issue on hold until it is working.

For more information about this issue, contact the current responsible for this owner in the nucleus' discord server.