Add dual exit modes: fixed USDT or premium multiple.

Net PnL (after estimated close fees) drives auto close; Plan/Settings expose the choice.

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

frontend/src/pages/Settings.tsx

@@ -21,7 +21,11 @@ export default function SettingsPage() {
   const [loading, setLoading] = useState(false);
 
   const [fee, setFee] = useState(0.0005);
-  const [exitPct, setExitPct] = useState(2);
+  const [exitMode, setExitMode] = useState<"fixed_usdt" | "premium_multiple">(
+    "fixed_usdt",
+  );
+  const [netTarget, setNetTarget] = useState(15);
+  const [premMult, setPremMult] = useState(1);
   const [rest, setRest] = useState(300);
   const [leverage, setLeverage] = useState(3);
   const [minHours, setMinHours] = useState(12);
@@ -35,7 +39,9 @@ export default function SettingsPage() {
     apiFetch<StrategySettings>("/api/settings/strategy")
       .then((s) => {
         setFee(s.fee_rate);
-        setExitPct(s.exit_move_pct ?? 2);
+        setExitMode(s.exit_mode === "premium_multiple" ? "premium_multiple" : "fixed_usdt");
+        setNetTarget(s.net_profit_target ?? 15);
+        setPremMult(s.premium_exit_multiple ?? 1);
         setRest(s.rest_seconds);
         setLeverage(s.leverage ?? 3);
         setMinHours(s.min_option_hours ?? 12);
@@ -87,7 +93,9 @@ export default function SettingsPage() {
         method: "PUT",
         body: JSON.stringify({
           fee_rate: fee,
-          exit_move_pct: exitPct,
+          exit_mode: exitMode,
+          net_profit_target: netTarget,
+          premium_exit_multiple: premMult,
           rest_seconds: rest,
           leverage,
           min_option_hours: minHours,
@@ -126,7 +134,7 @@ export default function SettingsPage() {
       {tab === "strategy" ? (
         <div className="card">
           <p style={{ color: "var(--muted)", marginTop: 0 }}>
-            无开仓时间窗；期权按剩余时长选到期 → 平值 → 校验杠杆；波动按百分比全平。
+            无开仓时间窗；期权按剩余时长选到期 → 平值 → 校验杠杆；出场可选固定金额或权利金倍数。
           </p>
           {stratOk ? <div style={{ color: "var(--up)", marginBottom: 12 }}>{stratOk}</div> : null}
           {err && tab === "strategy" ? <div className="err">{err}</div> : null}
@@ -171,17 +179,50 @@ export default function SettingsPage() {
               />
             </div>
             <div className="field">
-              <label htmlFor="exit">波动出场比例（%）</label>
-              <input
-                id="exit"
+              <label htmlFor="exitMode">出场规则</label>
+              <select
+                id="exitMode"
                 className="mono"
-                type="number"
-                step="0.1"
-                min="0.1"
-                value={exitPct}
-                onChange={(e) => setExitPct(Number(e.target.value))}
-              />
+                value={exitMode}
+                onChange={(e) =>
+                  setExitMode(
+                    e.target.value === "premium_multiple"
+                      ? "premium_multiple"
+                      : "fixed_usdt",
+                  )
+                }
+              >
+                <option value="fixed_usdt">固定净盈利（USDT）</option>
+                <option value="premium_multiple">权利金倍数</option>
+              </select>
             </div>
+            {exitMode === "fixed_usdt" ? (
+              <div className="field">
+                <label htmlFor="netTarget">净盈利出场目标（USDT）</label>
+                <input
+                  id="netTarget"
+                  className="mono"
+                  type="number"
+                  step="0.1"
+                  min="0.1"
+                  value={netTarget}
+                  onChange={(e) => setNetTarget(Number(e.target.value))}
+                />
+              </div>
+            ) : (
+              <div className="field">
+                <label htmlFor="premMult">权利金倍数（1 = 一倍权利金）</label>
+                <input
+                  id="premMult"
+                  className="mono"
+                  type="number"
+                  step="0.1"
+                  min="0.1"
+                  value={premMult}
+                  onChange={(e) => setPremMult(Number(e.target.value))}
+                />
+              </div>
+            )}
             <div className="field">
               <label htmlFor="closeDev">平仓买一/标记最大偏差（%）</label>
               <input