Rebrand to 比特骆驼自动化对冲系统; clear login autofill and sim subtitle.

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

frontend/src/pages/Login.tsx

@@ -5,7 +5,7 @@ import InstallBadge from "../components/InstallBadge";
 
 export default function LoginPage() {
   const nav = useNavigate();
-  const [username, setUsername] = useState("admin");
+  const [username, setUsername] = useState("");
   const [password, setPassword] = useState("");
   const [err, setErr] = useState("");
   const [loading, setLoading] = useState(false);
@@ -29,10 +29,9 @@ export default function LoginPage() {
     <div className="login-wrap">
       <form className="login-box" onSubmit={onSubmit}>
         <div className="login-title-row">
-          <h1>OKX 自动化对冲系统</h1>
+          <h1>比特骆驼自动化对冲系统</h1>
           <InstallBadge />
         </div>
-        <p>模拟盘登录 · 支持电脑/平板安装为应用</p>
         {err ? <div className="err">{err}</div> : null}
         <div className="field">
           <label htmlFor="user">用户名</label>