feat: add full-margin position sizing mode across four exchanges
Env POSITION_SIZING_MODE switches risk vs full-margin (available*buffer, BTC/ETH 10x). Blocks trend/roll/key auto opens in full margin, purges breakout/fib monitors with WeChat notice, keeps RR check and initial SL snapshot for records. Co-authored-by: Cursor <cursoragent@cursor.com>
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