feat(lock): 补充关机/重启黑屏开关 enableShutdownBlackWidget 配置

[mhduiy]

变更内容

1. 在 snipe 配置补全 enableShutdownBlackWidget 默认开启定义
2. 供 ShutdownBlackWidget 判断是否启用关机/重启黑屏界面

PMS: TASK-395319
Influence: 关机/重启黑屏可通过该配置开关

Summary by Sourcery

New Features:

• Add the enableShutdownBlackWidget configuration option to control the shutdown and restart black-screen interface.

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

通过补充 snipe 默认配置 enableShutdownBlackWidget，为关机/重启黑屏界面增加可配置的启停开关，默认保持启用。

File-Level Changes

Change	Details	Files
补全关机/重启黑屏功能的配置开关，并为其提供默认启用值。	在 snipe 配置中新增 enableShutdownBlackWidget 默认配置项 供 ShutdownBlackWidget 读取该配置并决定是否启用黑屏界面	configs/snipe/org.deepin.dde.lock.json

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[deepin-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: mhduiy, yixinshark

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