feat: submit api key and add language to Configuration and fetch llm factory list on UserSettingModel mount (#121)

* feat: fetch llm factory list on UserSettingModel mount

* feat: add language to Configuration

* feat: submit api key

feat: rename conversation and delete conversation and preview reference image and fetch file thumbnails (#79)

* feat: fetch file thumbnails

* feat: preview reference image

* feat: delete conversation

* feat: rename conversation

* feat: extract SimilaritySlider

* feat: create a chat assistant

* feat: modify routing to nested mode

* feat: rename document