fix: add X-Deepin-Singleton flag to desktop file (#392841)

[add-uos]

Add X-Deepin-Singleton=true to desktop file to mark the application as a singleton app. This allows AM to identify singleton apps and inform Treeland to skip the splash screen for these apps.

Refs: https://pms.uniontech.com/task-view-392841.html

Summary by Sourcery

Mark deepin-devicemanager as a singleton application via its desktop file to enable correct handling by the application manager and Treeland.

New Features:

• Mark the deepin-devicemanager application as a singleton so the environment can treat it accordingly.

Enhancements:

• Update the desktop entry metadata to allow the application manager and Treeland to skip splash screens for singleton apps.

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Adds the X-Deepin-Singleton flag to the deepin-devicemanager desktop entry so AM can treat it as a singleton app and Treeland can skip the splash screen.

File-Level Changes

Change	Details	Files
Mark the Deepin Device Manager desktop entry as a singleton application via a new desktop file key.	Add X-Deepin-Singleton=true key to the desktop entry to declare the app as singleton. Ensure the singleton flag is placed alongside other desktop entry keys to be correctly parsed by AM/Treeland.	deepin-devicemanager/assets/deepin-devicemanager.desktop

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[sourcery-ai]

Hey - I've reviewed your changes and they look great!

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[deepin-ci-robot]

deepin pr auto review

★ 总体评分：100分

■ 【总体评价】

代码为桌面快捷方式配置添加了单例运行属性，修改简单且符合规范
逻辑正确无安全风险，功能实现完善

■ 【详细分析】

• 1.语法逻辑（基本正确）✓

在 deepin-devicemanager.desktop 文件中新增了 X-Deepin-Singleton=true 属性，符合 Desktop Entry 规范及 Deepin 扩展字段格式
潜在问题：无
建议：无

• 2.代码质量（优秀）✓

修改位置准确，配置项命名规范，直接作用于应用启动行为
潜在问题：无
建议：无

• 3.代码性能（无性能问题）✓

配置文件的修改不影响运行时性能，单例模式反而可能减少重复启动带来的资源消耗
潜在问题：无
建议：无

• 4.代码安全（存在0个安全漏洞）✓

漏洞对比统计：新增漏洞 0 个，减少漏洞 0 个，持平 0 个
本次修改仅涉及桌面配置文件单例属性的添加，不存在任何外部输入处理或敏感操作，无攻击面

• 建议：无

■ 【改进建议代码示例】

diff --git a/deepin-devicemanager/assets/deepin-devicemanager.desktop b/deepin-devicemanager/assets/deepin-devicemanager.desktop
index 38c37703..7b3f39bb 100644
--- a/deepin-devicemanager/assets/deepin-devicemanager.desktop
+++ b/deepin-devicemanager/assets/deepin-devicemanager.desktop
@@ -10,6 +10,7 @@ Terminal=false
 Type=Application
 X-Ayatana-Desktop-Shortcuts=deepin-devicemanager
 X-Deepin-Vendor=deepin
+X-Deepin-Singleton=true
 
 # Translations:
 # Do not manually modify!

[deepin-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: add-uos, lzwind

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• debian/deepin/OWNERS

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