fix: treat system-directory apps as pre-installed when InstalledTime is missing

[18202781743]

问题背景

卸载应用程序后执行"恢复出厂设置"，恢复完成后已卸载的应用程序仍出现在启动器的"最近安装"列表中。

根因

dde-application-manager 的 ApplicationService 构造函数中，当 firstLaunch == false 且 InstalledTime 记录缺失（null）时，原逻辑无条件设为当前时间戳。恢复出厂设置后，不可变系统 base 层恢复了预装应用的 desktop 文件，但 storage.json（位于 ~/.local/share/）被保留，导致这些应用被误判为"最近安装"。

修复方案

• 新增辅助函数 isFromSystemApplicationsDir()：遍历 getApplicationsDirs() 返回的目录列表，排除以 getXDGDataHome() 开头的用户级目录，判断 desktop 来源路径是否属于系统级目录。
• 修改 InstalledTime 为 null 的分支：系统级目录应用 InstalledTime = 0（视为预装），用户级目录应用设为当前时间戳（行为不变）。

改动文件

• src/dbus/applicationservice.cpp

关联

• PMS: BUG-308223
• Multica Issue: https://agent-dev.uniontech.com/dde/issues/7c6f66c7-a8af-46c1-b59f-bed257e5e6d5

Summary by Sourcery

Bug Fixes:

• Prevent previously uninstalled system applications from reappearing in the launcher’s recent installs list after a factory reset by treating them as pre-installed when InstalledTime is absent.

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[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

This PR adjusts how InstalledTime is initialized for applications whose desktop files originate from system-level application directories, so that system apps without an InstalledTime are treated as pre-installed instead of recently installed, and adds a helper to detect system vs user application directories.

File-Level Changes

Change	Details	Files
Introduce a helper to detect whether a desktop file originates from a system-level applications directory and use it to set InstalledTime to 0 for such apps when the stored InstalledTime is missing.	Add static helper function that normalizes the desktop source path, iterates application directories, skips user-level directories based on XDG data home, and checks for system-level directory prefix match. Update ApplicationService constructor logic for null InstalledTime to assign 0 for system-directory apps and current timestamp for user-directory apps, preserving existing behavior for user-installed apps. Maintain existing error handling for storage failures while basing InstalledTime initialization on the new system-directory detection.	src/dbus/applicationservice.cpp

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