refactor user model and schemas to consolidate name fields and remove signup schema

Refactor Dockerfile and clean up unused schemas; update Redis client initialization and environment configuration

code refactor

Refactor session and user models to use Link for user_id and clean up field definitions; update base repository methods to handle link rules and fetching links.

fix email field on user model

Refactor Session and User models to use user_id and Indexed email field

Add user and session models with MongoDB integration