fix: batch backtest lot size, DD% formula, max position exposure
- mt5_batch_backtest.py / view_batch_backtest.py: fix update_param to clear MT5 .set flag bit 2 (use-default) and update default field so manual lot size actually takes effect - view_portfolio_master.py: Max DD% now uses deposit not running peak, Max Position Exposure rebuilt as proper timeline sweep - view_portfolio_builder.py: Max DD% formula aligned to match master - view_portfolio_master.py / view_portfolio_builder.py: results table now shows full stats columns including Stability score
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