Add Binance SIM market adapter and exchange switch in settings.

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

frontend/src/pages/Plan.tsx

@@ -124,7 +124,9 @@ export default function PlanPage() {
     <div>
       <h2 style={{ marginTop: 0 }}>自动对冲计划</h2>
       <p style={{ color: "var(--muted)", marginTop: -8 }}>
-        SIM 本地撮合 · 期权只买 · 净盈利达标或到期全平
+        SIM 本地撮合 · 行情{" "}
+        {(snap?.exchange || "okx").toUpperCase()}
+        {snap?.perp_inst_id ? ` · ${snap.perp_inst_id}` : ""} · 净盈利达标或到期全平
       </p>
       {err ? <div className="err">{err}</div> : null}