Supports obtaining PDF documents from web pages (#1107)

feat: select the corresponding parsing method according to the file type and after the document is successfully uploaded, use the ChunkMethodModal to select the parsing method. and remove ChunkMethodModal from knowledge-file (#158)

feat: display all pdf pages and add DocumentPreview (#88)

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

feat: confirm before deleting knowledge base and add ChunkToolBar (#56)

feat: modify routing to nested mode and rename document (#52)

feat: remove loading from model and use DvaModel instead of redundant types such as kAModelType (#47)

set port (#39)

update knowledge_kb (#34)

add front end code (#27)