Add OKX-style funds bar with USDT/USDC convert and transfer.

SIM uses multi-wallet balances; LIVE hits OKX asset/account APIs and spot USDC-USDT swap. Funds strip hides sim labeling.

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

frontend/src/pages/Plan.tsx

@@ -168,8 +168,7 @@ export default function PlanPage() {
       <div className="plan-desktop-head">
         <h2 style={{ marginTop: 0 }}>自动对冲计划</h2>
         <p style={{ color: "var(--muted)", marginTop: -8 }}>
-          {plan?.mode === "LIVE" ? "LIVE 实盘下单" : "SIM 本地撮合"} · 行情{" "}
-          {(snap?.exchange || "okx").toUpperCase()}
+          行情 {(snap?.exchange || "okx").toUpperCase()}
           {snap?.perp_inst_id ? ` · ${snap.perp_inst_id}` : ""} ·
           目标平仓(双腿/远虚只平永续) · 未达标则到期结算
           {plan?.mode === "LIVE" && plan.live_ready === false