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:

• Declare deepin-album as a singleton app via the X-Deepin-Singleton flag in its desktop file.

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Adds the X-Deepin-Singleton flag to the deepin-album desktop entry so album is treated as a singleton app and Treeland can skip its splash screen.

File-Level Changes

Change	Details	Files
Mark the Deepin Album application as a singleton via its desktop entry.	Add X-Deepin-Singleton=true key to the desktop file entry so the application is recognized as a singleton by AM/Treeland	src/deepin-album.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】

代码在桌面配置文件中正确添加了单例模式控制属性，符合UOS应用规范。
逻辑正确且无任何安全漏洞，修改简洁有效。

■ 【详细分析】

• 1.语法逻辑（完全正确）✓

在 src/deepin-album.desktop 文件中新增 X-Deepin-Singleton=true，符合 .desktop 文件的 INI 格式规范，键值对书写正确。
潜在问题：无
建议：无需修改

• 2.代码质量（符合规范）✓

新增的属性 X-Deepin-Singleton 遵循了 Deepin/UOS 桌面环境的扩展命名规范（X-Deepin- 前缀），放置位置合理，与同类属性排列在一起。
潜在问题：无
建议：无需修改

• 3.代码性能（无性能问题）✓

仅增加一个配置项，对应用启动和运行时的性能没有任何负面影响，反而通过单例控制可能减少多开带来的资源占用。
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
本次修改仅涉及桌面环境配置项的添加，不包含任何可执行代码、外部输入处理或敏感信息，不存在安全风险。

• 建议：无需修改

■ 【改进建议代码示例】

// 无需修改，当前代码已完美实现单例控制配置
 X-Deepin-ManualID=deepin-album
 X-Deepin-TurboType=dtkwidget
 X-Deepin-Vendor=deepin
 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

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• debian/deepin/OWNERS

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