b81a972245
DTO 验证规则: - CreateJournalReq: title 1-200, tags ≤20 - UpdateJournalReq: title 1-200, tags ≤20 - CreateClassReq: name 1-50, school_name ≤100 - JoinClassReq: class_code = 6位 - UpdateClassReq: name 1-50, school_name ≤100 - SyncReq: changes ≤100 条 - CreateTopicReq: title 1-200, description ≤2000 - UpdateTopicReq: title 1-200, description ≤2000 - CreateCommentReq: content 1-1000 - CreateStickerPackReq: name 1-50, description ≤500 - UpdateStickerPackReq: name 1-50, description ≤500 - CreateStickerReq: name 1-30, image_url 1-500 - BindChildReq/DeleteChildDataReq: Validate derive (Uuid 已由 serde 验证) Handler 调用: validate() 放在 require_permission() 之前（先验证输入再检查权限） 审计 ID: 5a-C01, 5a-C02, 5a-C03