Switch Polymarket integration to Gamma API for better reliability and add price bounds filter

Optimize fetch_and_scan: drop Kalshi auth, add early string filter, enforce fee threshold

Fix Kalshi 401 error by migrating REST URL to api.elections.kalshi.com domain

Integrate live Polymarket and Kalshi APIs for true real-time arbitrage scanning

Replace static orderbooks with dynamic simulated REST API feeds

Fix StreamlitAPIException by moving set_page_config to very top

Add Supabase integration for remote trade logging

Fix nested button execution by making opps persistent

Fix UI state reset by using st.session_state for portfolio variables

Add root app.py for Streamlit GUI and dependencies