[FEATURE]: Change all competitions calculations to the backend

[jonsnowpt]

Does a duplicate issue exist?

• [X] I have searched the existing issues

🤔 Is feature request related to a problem? Please describe the problem.

At this time, we have competition calculations, like potential wins, being done in the front end; this is not the best approach since if we need to make a change, it will make us change in different places, which is hard to map. wins

📝 Feature Request Description

Bring all calculations to the backend and to the database; this way, the frontend just needs to consume the data, and it will allow to change only once.

➕ Further context and resources (cummulative)

https://betarena.slack.com/archives/D02B1UHEECS/p1696362453975789