Add risk-based position sizing (以损定仓) with per-open k resize.
Manual vs risk modes are exclusive; each open floors k to 1 decimal so estimated premium+fees stay within the loss budget. Co-authored-by: Cursor <cursoragent@cursor.com>
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## 2026-07-29 — 以损定仓(智能调仓)
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### 变更
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1. 设置页仓位模式二选一:**手动** / **以损定仓**;互斥手填名义与出场。
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2. 以损定仓:亏损幅度(交易账户总资金或单独本金)或亏损值;每次开仓前按 ATM 卖一+指数粗估手续费反推 `k`(一位小数向下),写出永续 `1k` / 期权 `2k` / 出场 `15k`。
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3. 估算最大亏损 = 权利金(`ask×2k`) + 手续费(`指数×fee_rate×3×k`),保证 ≤ 预算。
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### 审计
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见同日推送前两轮自审(公式边界、开仓钩子、设置互斥、回归测试)。
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## 2026-07-29 — 部署:半截 .venv 必须重建(缺 activate)
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### 变更
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