fix: resolve residual image files issue after document deletion #7964
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What problem does this PR solve?
When deleting knowledge base documents in RAGFlow, the current process only removes the block texts in Elasticsearch and the original files in MinIO, but it leaves behind many binary images and thumbnails generated during chunking. This pull request improves the deletion process by querying the block information in Elasticsearch to ensure a more thorough and complete cleanup.
Type of change