Add risk leverage basis option: actual ask vs selection leverage.

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

frontend/src/api/client.ts

@@ -331,6 +331,7 @@ export type StrategySettings = {
   option_qty_eth?: number;
   show_manual_trade_buttons?: boolean;
   sizing_mode?: "manual" | "risk_based";
+  risk_leverage_basis?: "actual" | "selection";
   risk_loss_mode?: "percent" | "absolute";
   risk_loss_pct?: number;
   risk_loss_usdt?: number;

frontend/src/pages/Settings.tsx

@@ -89,6 +89,9 @@ export default function SettingsPage() {
   const [optQty, setOptQty] = useState(2);
   const [showManualTrade, setShowManualTrade] = useState(false);
   const [sizingMode, setSizingMode] = useState<"manual" | "risk_based">("manual");
+  const [riskLeverageBasis, setRiskLeverageBasis] = useState<
+    "actual" | "selection"
+  >("selection");
   const [riskLossMode, setRiskLossMode] = useState<"percent" | "absolute">(
     "percent",
   );
@@ -197,6 +200,9 @@ export default function SettingsPage() {
         setOptQty(s.option_qty_eth ?? 2);
         setShowManualTrade(s.show_manual_trade_buttons === true);
         setSizingMode(s.sizing_mode === "risk_based" ? "risk_based" : "manual");
+        setRiskLeverageBasis(
+          s.risk_leverage_basis === "actual" ? "actual" : "selection",
+        );
         setRiskLossMode(s.risk_loss_mode === "absolute" ? "absolute" : "percent");
         setRiskLossPct(s.risk_loss_pct ?? 1);
         setRiskLossUsdt(s.risk_loss_usdt ?? 15);
@@ -358,6 +364,7 @@ export default function SettingsPage() {
         close_bid_mark_max_pct: closeDevPct,
         show_manual_trade_buttons: showManualTrade,
         sizing_mode: sizingMode,
+        risk_leverage_basis: riskLeverageBasis,
         risk_loss_mode: riskLossMode,
         risk_loss_pct: riskLossPct,
         risk_loss_usdt: riskLossUsdt,
@@ -679,6 +686,30 @@ export default function SettingsPage() {
                   </div>
                   {sizingMode === "risk_based" ? (
                     <>
+                      <div className="field">
+                        <label htmlFor="riskLevBasis">节奏杠杆（定仓口径）</label>
+                        <select
+                          id="riskLevBasis"
+                          className="mono"
+                          value={riskLeverageBasis}
+                          onChange={(e) =>
+                            setRiskLeverageBasis(
+                              e.target.value === "actual"
+                                ? "actual"
+                                : "selection",
+                            )
+                          }
+                        >
+                          <option value="selection">
+                            选约杠杆（推荐控节奏）
+                          </option>
+                          <option value="actual">实际杠杆（盘口卖一）</option>
+                        </select>
+                        <p className="hint" style={{ margin: "0.35rem 0 0" }}>
+                          选约杠杆：按「指数÷期权杠杆≥」估权利金算 k，权利金再便宜也不放大仓位。
+                          实际杠杆：按盘口卖一定仓，便宜时 k 会变大。
+                        </p>
+                      </div>
                       <div className="field">
                         <label htmlFor="riskLossMode">亏损约束</label>
                         <select
@@ -794,7 +825,14 @@ export default function SettingsPage() {
                               ? bud.toFixed(2)
                               : "—";
                             const mxS = Number.isFinite(mx) ? mx.toFixed(2) : "—";
-                            return `k=${pk ?? "—"} · 预算=${budS}U · 估亏=${mxS}U · 永续=${perp ?? "—"} · 期权=${opt ?? "—"} · 出场=${exit ?? "—"}`;
+                            const basis =
+                              riskPreview.leverage_basis === "actual"
+                                ? "实际杠杆"
+                                : riskPreview.leverage_basis === "selection"
+                                  ? "选约杠杆"
+                                  : "";
+                            const basisS = basis ? ` · ${basis}` : "";
+                            return `k=${pk ?? "—"} · 预算=${budS}U · 估亏=${mxS}U · 永续=${perp ?? "—"} · 期权=${opt ?? "—"} · 出场=${exit ?? "—"}${basisS}`;
                           })()}
                         </div>
                       </div>