shenleiandClaude Opus 5
5faeda5e2d
纯代码搬移，不改行为：_restore、快照 JSON 构建及相关解析函数移入 part 文件。 已用覆盖全部存档字段的快照比对验证，重构前后写出的存档逐字节一致。 Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
kouyu_english
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