[Bug]: 会话丢失

## QwenPaw Version
win10,2.2.1，desktop

8点多一次对话完结，又发起对话9点多完结，后面没管电脑，再次查看，卡住了，好像是重新部署插件，然后执行shutdown，我点击停止按钮。重新让它继续从中断处开发，结果不停地recall history，居然找不到9点多那次会话。
对话丢失，在控制-会话中完全找不到。
丢失之前，提示我要配置大模型，连大模型也丢失了。然后我退出桌面端，大模型重新选一下即可。但是对话完全找不到了。

之前我就反复遇到过模型丢失的问题https://github.com/agentscope-ai/QwenPaw/issues/7708#issue-5422929724

现在智能体有4个，后面两个是做任务的时候，自己产生的，我没有去新建智能体。后面这两个能删吗？

No files, paths, or tests are named in this issue. Reproduce the described flow in the Windows desktop app: finish a chat, redeploy plugin, stop/shutdown, relaunch, and check whether the missing 9:00 session appears in 控制-会话 and model selection is restored. Then trace the session-history restore and model-config reload flow in the app startup path; done means the lost conversation is retained and selectable after restart without being lost.

Written by the indexing model from the issue text.