feat(backup): 新增按需（选择性）文件恢复#91
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在内容浏览基础上支持只恢复勾选的文件/目录到原位置，满足「只找回某个误删文件」
这一最常见的恢复诉求，无需整体覆盖恢复。
- backup：TaskSpec.SelectedPaths；FileRunner.Restore 按选中集合过滤提取，
选中目录即恢复其子项；差异链中删除项亦仅在选中范围内应用（避免误删未选中文件）
路径仅作为成员判断，不参与文件路径构造，无路径穿越面
- restore：RestoreService.StartSelective（Start 委托其 nil 入参，零破坏既有调用）；
校验按需恢复仅限本机文件备份；选中路径透传至 spec
- http：POST /backup/records/:id/restore 可选 body { selectedPaths }
- 前端：内容浏览弹窗支持勾选与「恢复选中」，触发按需恢复并跳转恢复日志
测试：pathSelected 边界、按需恢复端到端（仅选中项还原、未选中不出现）；
go test 全绿；tsc --noEmit 通过。
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背景
此前恢复是「全有或全无」——要么整体覆盖恢复，要么不恢复。但最常见的恢复诉求其实是「只把误删的那一个文件/目录找回来」。本 PR 在上一个「内容浏览」能力之上，补齐按需（选择性）恢复，形成完整的「浏览 → 勾选 → 恢复」恢复闭环。
实现
backup：TaskSpec.SelectedPaths；FileRunner.Restore按选中集合过滤——仅提取选中的文件，选中目录则恢复其全部子项；差异链中的删除项也仅在选中范围内应用，避免误删未选中文件。pathSelected）与前端筛选，从不参与文件写入路径的构造（写入路径仍来自归档条目名），因此无路径穿越/注入面——区别于请求传入目标路径的 feat(restore): 恢复到指定目录（文件类型本机恢复 + 确认弹窗输入） #86。restore：新增RestoreService.StartSelective，原Start委托其nil入参（零破坏既有调用）；校验按需恢复仅限本机文件备份；选中路径透传至 spec，对恢复链（全量+差异）逐段一致过滤。http：POST /backup/records/:id/restore接受可选 body{ selectedPaths }。测试
pathSelected边界（精确匹配/目录子项/前缀相近不误判）go test ./...全绿；tsc --noEmit通过范围