fix(knowledge): Fix the issue of ineffective pagination parameters in the image-based knowledge base

[liuyunchao-1998]

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修复图片型知识库分页参数不生效的问题

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en:When paginating the image-based knowledge base, the offset parameter does not take effect. And the field values of 'order by' are all the same, causing MySQL to randomly query
zh(optional): 图片型知识库分页时，offset参数未生效。且order by的字段值全部相同，导致mysql随机查询

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[codecov-commenter]

Codecov Report

❌ Patch coverage is 4.79452% with 139 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
backend/domain/knowledge/service/event_handle.go	0.00%	74 Missing ⚠️
...ledge/internal/dal/dao/knowledge_document_slice.go	10.00%	36 Missing ⚠️
backend/domain/knowledge/processor/impl/base.go	11.11%	21 Missing and 3 partials ⚠️
backend/domain/knowledge/service/knowledge.go	0.00%	5 Missing ⚠️

Files with missing lines	Coverage Δ
backend/domain/knowledge/repository/repository.go	100.00% <ø> (ø)
backend/domain/knowledge/service/knowledge.go	9.99% <0.00%> (+<0.01%)	⬆️
backend/domain/knowledge/processor/impl/base.go	55.24% <11.11%> (-6.87%)	⬇️
...ledge/internal/dal/dao/knowledge_document_slice.go	24.62% <10.00%> (-2.49%)	⬇️
backend/domain/knowledge/service/event_handle.go	2.24% <0.00%> (-0.16%)	⬇️

... and 4 files with indirect coverage changes

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