Add native Index-to-Futures options mapping (SPX/SPY to ES, NDX/QQQ to NQ) for Gamma/Orderflow indicators.

Currently, ATAS native options indicators only pull from the CME futures options chains (e.g., NQ, ES). Because index options volume is heavily concentrated on Cboe (SPX, NDX) and equity ETFs (QQQ, SPY), the CME data alone provides an incomplete picture of market gamma and orderflow.

Please consider adding backend calculations to map cash index/ETF options data directly onto the corresponding futures charts (accounting for the live basis spread), similar to how platforms like GEXBot handle cross-asset mapping. This would allow native ATAS indicators like the GEX Profile and OI Profile to reflect true market convexity and major structural walls for the S&P 500 and Nasdaq.