Restore TTM quarterly fetching

Fix bank interest expense logic

Switch to audited 12M data, fix frontend 'I' bug and mobile scroll

Replace yfinance with yahooquery, add TTM support

Replace mock data with dynamic IP proxy rotation

Implement custom crumb-catcher for Yahoo Finance

Add requests_cache to prevent Yahoo Finance rate limits

Add inexhaustible fallback for yfinance rate limits

Update RAG prompt to prioritize explicit figures and respect negative signs

Add User-Agent session to yfinance

Sync uncommitted local backend changes

Update language tone to be neutral and objective

Initialize project structure with backend and frontend code bases