feat: Supabase-backed user data (portfolio, favorites, trades, alerts, notifications)

feat: live position monitoring with charts + trading system production ready

fix: Toy yok policy uygulandı - tüm UI/API endpoint'leri gerçek veriye bağlandı

Production-ready: Eliminate toy data, enforce BUY gates, add API proxies

Use fetchJson wrapper across pages/components

Remove Supabase placeholder hardcodes; show config warnings

Fix HF health check + remove hardcoded API base

Fix client crash: guard undefined values before toFixed

Redesign Next.js UI to match Streamlit features - Add AI analysis page with 4 tabs (market, stock, sector, portfolio) - Enhance ML scan with model/market/days selection - Create new stocks analysis page - Update navigation

Fix HF ML predictions + frontend rendering

Add missing API endpoints: stocks, movers, scanner, backtest, sentiment, news

Add Next.js components