TYPO

Astounding and Great Template for SQL-based Project with FastAPI.
There's a small typo with `USERNAME` here: https://github.com/Aeternalis-Ingenium/FastAPI-Backend-Template/blob/571981c3d6af5feccb90de25a81e82442c22b40f/backend/src/config/settings/base.py#L35C11-L35C11

Consider making this for NoSQL-based aswell as it seems really becoming "Convention" to startup on any project!