dsh-chat-tweaks haiyoucuv

DSH web UI-tweak plugin: show the provider display name next to the model name in the composer model seat, remove the chat column max-width, and more — every feature has its own switch on a dedicated Settings page. / DSH web 界面美化插件：在模型选择器显示厂商名、取消对话列最大宽度等，每个功能都在独立的「设置 → 聊天增强」页中开关。