Use exchange fees, UPL, funding for LIVE PnL; USDC 1:1 to USDT.

Option open P&L stays local (option net); exit target ignores estimated close fees.

Co-authored-by: Cursor <cursoragent@cursor.com>

backend/app/live/money.py

@@ -0,0 +1,20 @@
+"""实盘金额口径：统一折 USDT（USDC 等 1:1）。"""
+
+from __future__ import annotations
+
+
+def to_usdt(amount: float, ccy: str | None = None) -> float:
+    """按约定将币种金额折成 USDT；USDC/USD/USDT 一律 1:1。"""
+    a = float(amount or 0.0)
+    if a == 0.0:
+        return 0.0
+    c = (ccy or "USDT").strip().upper()
+    if c in ("USDT", "USDC", "USD", ""):
+        return a
+    # 其他币种暂按面值记（极少见）；后续可扩汇率
+    return a
+
+
+def abs_fee_usdt(fee: float, ccy: str | None = None) -> float:
+    """手续费记为正成本（USDT）。"""
+    return abs(to_usdt(fee, ccy))