refactor: 移除终端卡片中的窗口控制元素

frontend/index.html

@@ -241,7 +241,6 @@
         <main class="workspace">
           <section id="terminal-card" class="terminal-card">
             <div class="terminal-toolbar">
-              <div class="window-controls" aria-hidden="true"><i></i><i></i><i></i></div>
               <div
                 class="session-target"
                 aria-label="实时连接状态"