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 the X-Deepin-Singleton=true flag to the Deepin Reader .desktop file 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-reader desktop entry to mark the application as a singleton so AM/Treeland can handle splash behavior appropriately.

File-Level Changes

Change	Details	Files
Mark deepin-reader as a singleton application via its desktop entry.	Add X-Deepin-Singleton=true key to the desktop entry to indicate singleton behavior for the application	reader/deepin-reader.desktop

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[deepin-ci-robot]

deepin pr auto review

★ 总体评分：100分

■ 【总体评价】

代码正确添加了单例模式属性配置，符合桌面文件规范
逻辑清晰且无安全漏洞，无需扣分

■ 【详细分析】

• 1.语法逻辑（完全正确）✓

在 reader/deepin-reader.desktop 文件中新增 X-Deepin-Singleton=true 属性，符合 Desktop Entry 规范的键值对格式，语法无误。
潜在问题：无
建议：无需修改

• 2.代码质量（符合规范）✓

属性命名遵循 UOS 桌面环境的 X-Deepin- 前缀规范，放置位置合理，与其他属性保持一致。
潜在问题：无
建议：无需修改

• 3.代码性能（无性能问题）✓

仅为静态配置文件修改，不涉及运行时性能消耗。
潜在问题：
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
本次修改仅为桌面启动配置项的新增，不存在任何安全风险和攻击面。

• 建议：无需修改

■ 【改进建议代码示例】

// 无需修改，当前代码已是最优状态
StartupNotify=true
TryExec=deepin-reader
Type=Application
X-Deepin-Vendor=deepin
X-Deepin-Singleton=true

[sourcery-ai]

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

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[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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