feat: 按机器人选择 Agent Preset

在九个渠道的设置页卡片上选择 Host 已有预设；未选则跟随默认，只影响之后新建的会话。

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

test/channels/dingtalk/client-api.test.mjs

@@ -24,6 +24,7 @@ test('client exposes the fixed DingTalk RPC channel and endpoint names', () => {
     reconnectBot: 'bot.reconnect',
     deleteBot: 'bot.delete',
     setWorkspace: 'bot.workspace.set',
+    setAgentPreset: 'bot.preset.set',
   });
 });