refactor(agent): 移除会话消息清理逻辑以简化代码

清理了在会话切换时移除未完成识别消息的逻辑，因为该功能在当前场景下不再需要且可能引起混淆

lib/modules/agent/controllers/agent_controller.dart

@@ -632,15 +632,15 @@ class AgentController extends GetxController with WidgetsBindingObserver {
           final text = event.data['text'] ?? '';
           Logger.i(TAG, '[$sessionid]识别最终结果: $text');
 
-          if (currsessionid.value != "" && currsessionid.value != sessionid) {
+          // if (currsessionid.value != "" && currsessionid.value != sessionid) {
-            final index = messages.lastIndexWhere(
+          //   final index = messages.lastIndexWhere(
-                (msg) => msg.sessionid == currsessionid.value && msg.isUser);
+          //       (msg) => msg.sessionid == currsessionid.value && msg.isUser);
-            //出现了为识别结束的消息
+          //   //出现了为识别结束的消息
-            if (index >= 0) {
+          //   if (index >= 0) {
-              //异除去当前会话的识别中消息
+          //     //异除去当前会话的识别中消息
-              messages.removeAt(index);
+          //     messages.removeAt(index);
-            }
+          //   }
-          }
+          // }
           currsessionid.value = sessionid;
           // 查找是否有正在识别中的消息
           final index = messages.lastIndexWhere(