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

New Features:

• Introduce X-Deepin-Singleton flag in the deepin-editor desktop entry to identify it as a singleton app.

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Adds the X-Deepin-Singleton flag to the deepin-editor desktop entry so the application is treated as a singleton and splash screens can be skipped appropriately.

File-Level Changes

Change	Details	Files
Mark the deepin-editor application as a singleton via its desktop entry configuration.	Add X-Deepin-Singleton=true key to the desktop file entry so the application is recognized as a singleton by the application manager and Treeland. Ensure the new key is placed alongside existing desktop entry keys without altering other configuration values.	deepin-editor.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】

代码修改正确添加了单例运行属性配置
配置项格式合法且符合规范，无任何安全漏洞

■ 【详细分析】

• 1.语法逻辑（基本正确）✓

修改仅向 desktop 文件追加 X-Deepin-Singleton=true 属性，符合 Desktop Entry 规范的键值对格式要求，不会导致文件解析错误。
潜在问题：无
建议：无需修改

• 2.代码质量（良好）✓

属性命名遵循 X-Deepin 厂商前缀规范，放置位置位于相关 X-Deepin 属性区域内，保持了配置项的逻辑分组。
潜在问题：无
建议：无需修改

• 3.代码性能（无性能问题）✓

配置文件新增单行属性对应用启动性能无负面影响，该属性启用单例模式反而可能减少重复进程的资源占用。
建议：无需修改

• 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
该配置项为布尔值声明，不涉及外部输入处理、路径操作或权限控制，不存在安全攻击面。
建议：无需修复

■ 【改进建议代码示例】

diff --git a/deepin-editor.desktop b/deepin-editor.desktop
index 064d40a2..5859450d 100644
--- a/deepin-editor.desktop
+++ b/deepin-editor.desktop
@@ -11,6 +11,7 @@ Type=Application
 X-Deepin-AppID=deepin-editor
 X-Deepin-CreatedBy=com.deepin.dde.daemon.Launcher
 X-Deepin-Vendor=deepin
+X-Deepin-Singleton=true
 X-MultipleArgs=false
 
 # Translations:

[deepin-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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

The full list of commands accepted by this bot can be found here.

Details

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• debian/deepin/OWNERS

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