【工具链】版本快照：配置快照与一键回滚

function Snapshot.create(version, operator)
    local snap = {
        version = version, operator = operator, at = os.time(),
        files = {},
    }
    for _, name in ipairs(SNAPSHOT_FILES) do
        snap.files[name] = QF_ReadFile(name)
    end
    QF_PersistJson("snapshot_" .. version, snap)
    Snapshot.prune(30)
    return version
end

function Snapshot.rollback(version)
    local snap = QF_LoadJson("snapshot_" .. version)
    if not snap then return false, "快照不存在" end
    Snapshot.create("pre_rollback_" .. os.time(), "auto")
    for name, content in pairs(snap.files) do
        QF_WriteFile(name, content)
    end
    HotReload.applyAll()
    QF_NotifyGM("已回滚", version)
    return true
end