* feat: add DocumentPreview

* feat: display all pdf pages

* feat: fetch file thumbnails

* feat: preview reference image

* feat: delete conversation

* feat: rename conversation

* feat: confirm before deleting knowledge base

* feat: add ChunkToolBar

* feat: modify routing to nested mode

* feat: rename document

* feat: use DvaModel instead of redundant types such as kAModelType

* feat: set the type for registerServer

* feat: remove loading from model

* set port

* add knowledge-search

* update text

* update typescript

* add chunk api

* remove useless code