feat: P0+P1 production improvements

chore: Vercel proxy, Supabase edge fn, vscode settings, deno config

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

chore: remove macOS AppleDouble files from huggingface-space

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

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