feat(consultation): unify server-distributed agents without fixed roles

tests/e2e/fixtures/teacher-discussion-layout.tsx

@@ -4,9 +4,9 @@ import '../../../src/styles/globals.css';
 import '../../../src/pages/Chat/classroom-workspace.css';
 const width = Number(new URLSearchParams(location.search).get('width')) || 508;
 createRoot(document.getElementById('root')!).render(<div className="classroom-workspace flex h-screen flex-col bg-white">
-  <header className="flex h-10 shrink-0 items-center border-b px-5 text-xs">老师讨论交互测试 · 真实页面组件 / 模拟回复</header>
+  <header className="flex h-10 shrink-0 items-center border-b px-5 text-xs">智能体讨论交互测试 · 真实页面组件 / 模拟回复</header>
   <div className="flex min-h-0 flex-1 justify-end bg-[#f5f5f1]">
     <main className="min-w-0 flex-1 p-8"><h1 className="text-lg">我的小狗世界</h1><p className="mt-4 text-sm text-muted-foreground">作品区域</p></main>
-    <div className="h-full shrink-0 border-l" style={{ width }}><TeacherChatPanel projectId="fixture" sourceId="source" role="teacher" /></div>
+    <div className="h-full shrink-0 border-l" style={{ width }}><TeacherChatPanel projectId="fixture" sourceId="source" /></div>
   </div>
 </div>);