Add ATM open-offset toggle default off.

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

frontend/src/pages/Settings.tsx

@@ -31,6 +31,7 @@ export default function SettingsPage() {
   const [leverage, setLeverage] = useState(3);
   const [minHours, setMinHours] = useState(12);
   const [minOptLev, setMinOptLev] = useState(100);
+  const [atmOffOn, setAtmOffOn] = useState(false);
   const [maxAtmOff, setMaxAtmOff] = useState(3);
   const [closeDevPct, setCloseDevPct] = useState(30);
   const [perpQty, setPerpQty] = useState(1);
@@ -51,6 +52,7 @@ export default function SettingsPage() {
         setLeverage(s.leverage ?? 3);
         setMinHours(s.min_option_hours ?? 12);
         setMinOptLev(s.min_option_leverage ?? 100);
+        setAtmOffOn(s.atm_open_offset_enabled === true);
         setMaxAtmOff(s.max_atm_open_offset ?? 3);
         setCloseDevPct(s.close_bid_mark_max_pct ?? 30);
         setPerpQty(s.perp_qty_eth ?? 1);
@@ -109,6 +111,7 @@ export default function SettingsPage() {
           leverage,
           min_option_hours: minHours,
           min_option_leverage: minOptLev,
+          atm_open_offset_enabled: atmOffOn,
           max_atm_open_offset: maxAtmOff,
           close_bid_mark_max_pct: closeDevPct,
           perp_qty_eth: perpQty,
@@ -260,6 +263,21 @@ export default function SettingsPage() {
                     onChange={(e) => setMinOptLev(Number(e.target.value))}
                   />
                 </div>
+                <div className="field">
+                  <label htmlFor="atmoffOn">开仓 ATM 偏差限制</label>
+                  <select
+                    id="atmoffOn"
+                    className="mono"
+                    value={atmOffOn ? "1" : "0"}
+                    onChange={(e) => setAtmOffOn(e.target.value === "1")}
+                  >
+                    <option value="0">关闭（默认）</option>
+                    <option value="1">开启</option>
+                  </select>
+                  <p className="settings-hint">
+                    关闭时不限制 |ATM − 现价|；开启后超过下方点数则不开仓。
+                  </p>
+                </div>
                 <div className="field">
                   <label htmlFor="atmoff">开仓 ATM 最大偏差（点）</label>
                   <input
@@ -268,11 +286,12 @@ export default function SettingsPage() {
                     type="number"
                     step="0.5"
                     min="0"
+                    disabled={!atmOffOn}
                     value={maxAtmOff}
                     onChange={(e) => setMaxAtmOff(Number(e.target.value))}
                   />
                   <p className="settings-hint">
-                    |ATM 行权价 − 标的价| 超过该值则不开仓。默认 3；币安行权价步进较粗时可能长时间无开仓机会。
+                    仅在上方开关开启时生效。默认 3；币安行权价步进较粗时可能长时间无开仓机会。
                   </p>
                 </div>
               </div>