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

Build:

• Update the Deepin Boot Maker .desktop file to include the X-Deepin-Singleton flag for singleton app handling.

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

This PR updates the Deepin boot maker desktop entry to declare the application as a singleton so that the application manager and Treeland can handle it without showing a splash screen.

File-Level Changes

Change	Details	Files
Declare the Deepin boot maker desktop entry as a singleton application via a new desktop key.	Add the X-Deepin-Singleton=true key to the desktop entry to mark the app as singleton for Deepin Ensure the desktop file exposes the flag used by AM/Treeland to skip splash screens for singleton apps	src/app/platform/linux/deepin-boot-maker.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】

代码通过新增 desktop 属性实现了应用级单实例控制，与内部单例模式配合良好
修改逻辑正确且符合 UOS 规范，无安全漏洞，质量优秀

■ 【详细分析】

• 1.语法逻辑（完全正确）✓

在 deepin-boot-maker.desktop 文件中新增 X-Deepin-Singleton=true 属性，符合 Desktop Entry 规范的键值对语法。
潜在问题：无
建议：无需修改

• 2.代码质量（优秀）✓

属性命名遵循 DDE 桌面环境的自定义扩展规范，修改意图明确，与应用内部使用的 DSingleton<BMInterface> 模式相辅相成。
潜在问题：无
建议：无需修改

• 3.代码性能（无性能问题）✓

启用单实例模式可以避免重复启动进程，减少不必要的内存和 CPU 资源消耗，对性能有正面影响。
潜在问题：无
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
本次修改仅涉及配置文件属性的新增，不涉及任何用户输入处理、内存操作或系统命令执行，不存在安全风险。

• 建议：无需修改

■ 【改进建议代码示例】

# 当前代码已足够完善，无需进一步修改
[Desktop Entry]
X-Deepin-Singleton=true

[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

Needs approval from an approver in each of these files:

• debian/deepin/OWNERS

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