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:

• Mark the calendar application as a singleton via the X-Deepin-Singleton flag in its desktop file to support specialized handling by the application manager and window system.

[deepin-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: add-uos

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[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Adds the X-Deepin-Singleton flag to the dde-calendar desktop entry to mark the calendar application as a singleton so Application Manager can skip the splash screen for it.

File-Level Changes

Change	Details	Files
Mark the dde-calendar application as a singleton via its desktop file so upstream components can skip the splash screen.	Add X-Deepin-Singleton=true key to the desktop entry to indicate singleton behavior Ensure the desktop file metadata aligns with Deepin/AM expectations for identifying singleton apps	src/calendar-client/assets/dde-calendar.desktop

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[deepin-ci-robot]

deepin pr auto review

★ 总体评分：100分

■ 【总体评价】

代码为日历应用添加了单例运行模式配置，整体质量优秀。
修改逻辑正确，无安全风险，符合配置文件规范。

■ 【详细分析】

• 1.语法逻辑（基本正确）✓

在 dde-calendar.desktop 文件中新增了 X-Deepin-Singleton=true 配置项，语法符合 desktop 文件规范。
潜在问题：无
建议：无需修改

• 2.代码质量（符合规范）✓

新增的配置项位于 X-Deepin-Vendor 下方，格式对齐，符合规范。
潜在问题：无
建议：无需修改

• 3.代码性能（无性能问题）✓

启用单例模式可以防止用户多次启动日历应用导致资源浪费，有助于提升系统资源利用率。
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
本次修改仅为桌面配置文件增加单例属性，不涉及任何代码逻辑、外部输入处理或权限操作，无安全风险。

• 建议：无需修改

■ 【改进建议代码示例】

diff --git a/src/calendar-client/assets/dde-calendar.desktop b/src/calendar-client/assets/dde-calendar.desktop
index c422b523..9de3cb15 100644
--- a/src/calendar-client/assets/dde-calendar.desktop
+++ b/src/calendar-client/assets/dde-calendar.desktop
@@ -11,6 +11,7 @@ Terminal=false
 Type=Application
 #X-Deepin-TurboType=dtkwidget
 X-Deepin-Vendor=deepin
+X-Deepin-Singleton=true
 X-MultipleArgs=false
 
 # Translations: