Add comprehensive documentation for the "确认删除 (同步数据库)" button
flow, including:
- Core flow overview with Mermaid diagram
- Frontend interaction layer analysis (handleConfirmDeletion)
- IPC handler layer details (upsertBatch, delete handlers)
- Database DAO layer implementation with MySQL vs SQL Server differences
- Data flow diagram showing all layers
- Key data structures and error handling
- Comparison table with validation status flow
The document now covers both core business flows in the cleaner page:
1. Get and validate material status (read operation)
2. Confirm deletion/sync to database (write operation)
Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
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