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

Enhancements:

• Add X-Deepin-Singleton=true to the desktop files for data-transfer and dde-cooperation to declare them as singleton apps.

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Marks the data-transfer and dde-cooperation applications as singletons by adding the X-Deepin-Singleton flag to their Linux desktop entry files, enabling AM/Treeland to skip splash screens for these apps.

File-Level Changes

Change	Details	Files
Declare the data-transfer application as a singleton via its desktop entry.	Add X-Deepin-Singleton=true key to the desktop file to mark the app as singleton for the Deepin environment Ensure the key is placed alongside other Desktop Entry metadata so AM can detect it and Treeland can suppress splash screens	src/apps/data-transfer/res/linux/deepin-data-transfer.desktop
Declare the dde-cooperation application as a singleton via its desktop entry.	Add X-Deepin-Singleton=true key to the desktop file to mark the app as singleton for the Deepin environment Ensure the key is placed alongside other Desktop Entry metadata so AM can detect it and Treeland can suppress splash screens	src/apps/dde-cooperation/res/linux/dde-cooperation.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：95分

■ 【总体评价】

代码通过添加配置项正确启用了应用单例模式，防止重复启动
逻辑清晰无安全风险，因修改范围极小且无复杂逻辑扣5分

■ 【详细分析】

• 1.语法逻辑（完全正确）✓

在 deepin-data-transfer.desktop 和 dde-cooperation.desktop 中添加了 X-Deepin-Singleton=true，符合 Desktop Entry Specification 的键值对语法规范
潜在问题：无
建议：无需修改

• 2.代码质量（符合规范）✓

修改位于文件的标准扩展配置区域，紧跟其他 X-Deepin 扩展项，保持了良好的组织和一致性
潜在问题：无
建议：无需修改

• 3.代码性能（无性能问题）✓

仅增加一行配置文本，对应用启动和运行时的性能没有任何负面影响，反而通过单例模式可能节省系统资源
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
本次修改仅涉及静态配置文件的单行键值对添加，不涉及任何用户输入处理、网络通信或文件系统操作，不存在安全攻击面

• 建议：无需修改

■ 【改进建议代码示例】

// 当前修改已足够完善，无需额外修复

[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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