修复 #288 与 #289:恢复附件移动语义,统一「保留原文件」开关
Fix #288 and #289: restore attachment move semantics, unify the "keep original" toggle
若勾选,移动后不进行删除,默认不勾选。
If checked, the item will not be deleted after being moved; it is not checked by default.

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