[Feature Request]:Support for Knowledgebases Export and Import

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Is your feature request related to a problem?

Please support knowledgebase export and import！！！

Describe the feature you'd like

I found that I can't backup and merge my bases when I need to migrate one or more knowledgebases. I suggest that this mode may support uploaded files and OCRed chunks or maybe consider include knowledge graph to pack up to .tar/.zip files that we can avoid the need to export the whole docker volume every time.

Describe implementation you've considered

No response

Documentation, adoption, use case

Additional information

No response

No files, tests, or entry points are named. Begin by reviewing the current Docker-volume backup and migration approach, then define the export/import scope for uploaded files, OCRed chunks, and the optional knowledge graph; done means a documented, usable archive workflow for migrating or merging knowledgebases.