Add AI collaboration documentation

ReadMe file

pin bcrypt version for passlib compatibility

update CORS and add vercel routing

fix: add email-validator dependency

remove nixpacks.toml to use auto-detection

Add Railway deployment configuration

UI/UX improvements

feat: voting system

feat: dashboard UI with all sections

feat: external APIs integration

feat: add skip onboarding with edit preferences and banner system

feat: implement backend onboarding preferences endpoints

feat: authentication with signup and login

project setup with backend and frontend structure