feat: add file icon and add message popover content (#77)

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

feat: Modify the color of the svg icon in the header according to the selected state and feat: extract routing information from the knowledge base into constants (#51)

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)