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-voice-note.desktop file to indicate the app should run as a singleton.

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Adds the X-Deepin-Singleton flag to the desktop entry so the application is marked as a singleton and can be treated specially by AM/Treeland (e.g., skipping splash screen).

File-Level Changes

Change	Details	Files
Mark the application as a singleton via desktop entry metadata so AM and Treeland can adjust behavior (identification and splash-screen skipping).	Add X-Deepin-Singleton=true key to the desktop file’s [Desktop Entry] section to declare singleton behavior Ensure the key name and value follow Deepin’s expected convention for singleton app detection	assets/deepin-voice-note.desktop

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[sourcery-ai]

Hey - I've left some high level feedback:

• If this application is intended to be singleton across all launch entry points, consider updating any other related .desktop files (e.g., localized or variant launchers) to also include X-Deepin-Singleton=true for consistent behavior.

Prompt for AI Agents

Please address the comments from this code review:

## Overall Comments
- If this application is intended to be singleton across all launch entry points, consider updating any other related .desktop files (e.g., localized or variant launchers) to also include X-Deepin-Singleton=true for consistent behavior.

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[deepin-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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

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