Add configurable SIM equity (default 10k) and strategy docs.

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

frontend/src/pages/Settings.tsx

@@ -34,6 +34,7 @@ export default function SettingsPage() {
   const [closeDevPct, setCloseDevPct] = useState(30);
   const [perpQty, setPerpQty] = useState(1);
   const [optQty, setOptQty] = useState(2);
+  const [initialEquity, setInitialEquity] = useState(10000);
   const [stratOk, setStratOk] = useState("");
 
   useEffect(() => {
@@ -51,6 +52,7 @@ export default function SettingsPage() {
         setCloseDevPct(s.close_bid_mark_max_pct ?? 30);
         setPerpQty(s.perp_qty_eth ?? 1);
         setOptQty(s.option_qty_eth ?? 2);
+        setInitialEquity(s.initial_equity ?? 10000);
       })
       .catch(() => undefined);
   }, []);
@@ -106,9 +108,12 @@ export default function SettingsPage() {
           close_bid_mark_max_pct: closeDevPct,
           perp_qty_eth: perpQty,
           option_qty_eth: optQty,
+          initial_equity: initialEquity,
         }),
       });
-      setStratOk("策略参数已保存");
+      setStratOk(
+        "策略参数已保存（模拟资金仅在数值变更且无持仓时重置账本）",
+      );
     } catch (ex) {
       setErr(ex instanceof Error ? ex.message : String(ex));
     }
@@ -145,6 +150,21 @@ export default function SettingsPage() {
             <section className="settings-section">
               <h3>资金</h3>
               <div className="settings-fields">
+                <div className="field">
+                  <label htmlFor="equity">模拟资金（USDT）</label>
+                  <input
+                    id="equity"
+                    className="mono"
+                    type="number"
+                    step="100"
+                    min="1000"
+                    value={initialEquity}
+                    onChange={(e) => setInitialEquity(Number(e.target.value))}
+                  />
+                  <p className="settings-hint">
+                    保存后将权益重置为该金额（须无持仓）。默认 10000。
+                  </p>
+                </div>
                 <div className="field">
                   <label htmlFor="lev">永续杠杆倍数</label>
                   <input