K-Volatility Breakout

Remove use_trail logic and instead implement a fixed take-profit at 2x the ATR risk distance (entry ± atrVal * sl_multiplier * 2). Current trailing starts at 3% with 1% offset, which may be too tight and gets stopped out during normal ETH volatility before larger moves develop. Fixed 2R targets enforce disciplined reward-to-risk and prevent giving back profits, improving consistency of returns for Sharpe.