Extend semi-auto with ITM/ATM/OTM, offset, and 1:4 sizing.

Moneyness and perp:option units are plan-only; OTM enforces leverage >=180.

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

backend/app/strategy/risk_sizing.py

@@ -428,12 +428,18 @@ def compute_risk_sizing(
     index_px: float,
     option_ask: float,
     db: Database | None = None,
+    perp_unit: float | None = None,
+    option_unit: float | None = None,
 ) -> RiskSizingResult:
     database = db or get_db()
     ledger = Ledger(database)
     s = get_settings()
     fee_rate = ledger.get_setting_float("fee_rate", s.fee_rate)
     perp_u, opt_u, exit_u = read_risk_units(ledger)
+    if perp_unit is not None and float(perp_unit) > 0:
+        perp_u = float(perp_unit)
+    if option_unit is not None and float(option_unit) > 0:
+        opt_u = float(option_unit)
     basis_raw = ledger.get_setting_str(
         "risk_leverage_basis", s.risk_leverage_basis
     ) or s.risk_leverage_basis
@@ -682,6 +688,8 @@ def apply_risk_sizing_to_ledger(
     index_px: float,
     option_ask: float,
     db: Database | None = None,
+    perp_unit: float | None = None,
+    option_unit: float | None = None,
 ) -> RiskSizingResult:
     """计算并写入 perp/option/exit；非以损定仓模式直接 ok 跳过。持仓中拒绝改写。"""
     database = db or get_db()
@@ -699,7 +707,13 @@ def apply_risk_sizing_to_ledger(
                 detail="持仓中已锁定本组成交目标与名义，平仓后再自动计算",
             )
 
-    r = compute_risk_sizing(index_px=index_px, option_ask=option_ask, db=database)
+    r = compute_risk_sizing(
+        index_px=index_px,
+        option_ask=option_ask,
+        db=database,
+        perp_unit=perp_unit,
+        option_unit=option_unit,
+    )
     if not r.ok:
         return r