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

Update modality field to use pattern validation in Conversation model

Improve conversation handling to remove ephemeral_key from frontend and enforce modality validation

Refactor user ID handling in conversation and file controllers; update models to use user links instead of IDs

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

Implement AI voice controller and OpenAI client integration with API and WebSocket routes