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 Deepin Music desktop file to declare it as a singleton app for AM/Treeland integration.

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Adds the X-Deepin-Singleton flag to the deepin-music desktop file so the application is treated as a singleton and its splash screen can be skipped by Treeland and AM.

File-Level Changes

Change	Details	Files
Mark the Deepin Music application as a singleton via its desktop entry.	Add X-Deepin-Singleton=true key to the desktop entry to identify the app as singleton to AM/Treeland	src/music-player/data/deepin-music.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】

代码增加了单例模式配置，整体修改规范且无安全风险
逻辑正确且配置合理，无扣分项，仅因微小改动给予95分

■ 【详细分析】

• 1.语法逻辑（完全正确）✓

在 deepin-music.desktop 文件中新增 X-Deepin-Singleton=true 属性，符合 Desktop Entry Specification 规范，键值对格式正确。
潜在问题：无
建议：无需修改

• 2.代码质量（符合规范）✓

配置项命名规范，放置位置合理，保持了原有文件的格式和缩进风格，无冗余代码。
潜在问题：无
建议：无需修改

• 3.代码性能（无性能问题）✓

仅修改配置文件，不涉及运行时代码逻辑，对性能无影响。
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
本次修改仅增加桌面配置项，不涉及任何输入处理、网络请求或权限操作，无攻击面。

• 建议：无需修改

■ 【改进建议代码示例】

# 无需修改，当前代码已符合规范
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

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment

[lzwind]

/forcemerge

[deepin-bot]

This pr force merged! (status: blocked)