Merge chatbot in backend

[HuyLe61]

No description provided.

[HuyLe61]

@BlluryFace

[Autumn2OO5]

@HuyLe61
Code is clean and very professional, approved 👍
Functions inputs need type casting + function return type casting
Comment on what each function do
All of this might take some time for now but it will help a lot in the future in terms of debugging
Here is a project that I used to worked with other and this is its AI implementation, you can check it out to understand more about type casting, and return type casting: https://github.com/minhtq05/agilizer/blob/main/src/backend/business.py
Edit #1: I realize that since we are spawning a child process here, we can't have OOP

[HuyLe61]

@BlluryFace Check out my routes for chatbot. Note that I'm coding in ES6 module.