fix(retrieval): initial support for multimodality in Knowledge Base
Refs: #507
Co-authored-by: Amela<amela.fejza@huawei.com>
# message auto-generated for no-merge-commit merge:
!625 Experience Improvement(retrieval): initial support for multimodality in Knowledge Base
From: @amelafejza
Reviewed-by: @iamcandiceguo, @deyang
See merge request: openJiuwen/agent-core!625