docs: create professional and detailed README files for all subfolders

feat: implement weekly MLOps retraining loop and specialized multi-model router

feat: add user strategy performance tracker table, lockInStrategy GraphQL mutation, and auto-labeler updates

feat: add MLOps prediction logs table, background labeling task, and model metrics endpoint

feat: add secure 6-digit OTP email verification flow

feat: implement subscription packages, message limit quotas, and 3-day discount timer

feat: implement real-time price alerts via email with 2-minute reminder loops

feat: implement AI Analyst strategy history and persistence

feat: generate and apply initial database migrations to NeonDB

feat: configure Alembic env.py to dynamically load settings database URL and metadata

feat: Alembic is a lightweight database migration tool for SQLAlchemy. It tracks changes to your models and generates SQL scripts to update your database schema accordingly