feat: add DesktopSourcePath property to Application DBus interface

1. Added new DBus property "DesktopSourcePath" to expose the source path
of desktop files
2. Extended the ApplicationService class with getter method and change
signal
3. Updated DBus XML interface definition to include the new property
4. The property provides read-only access to the desktop file source
path for external applications

feat: 为应用DBus接口添加DesktopSourcePath属性

1. 新增DBus属性"DesktopSourcePath"以暴露桌面文件的源路径
2. 扩展ApplicationService类，添加获取方法和变更信号
3. 更新DBus XML接口定义以包含新属性
4. 该属性为外部应用提供对桌面文件源路径的只读访问

PMS: BUG-351621

Author: mhduiy

api/dbus/org.desktopspec.ApplicationManager1.Application.xml

@@ -174,6 +174,7 @@
         </property>
 
         <property name="X_CreatedBy" type="s" access="read"/>
+        <property name="DesktopSourcePath" type="s" access="read"/>
 
         <method name="SendToDesktop">
             <arg type="b" name="success" direction="out"/>

src/dbus/applicationservice.cpp

@@ -718,6 +718,11 @@ QString ApplicationService::X_CreatedBy() const noexcept
     return findEntryValue(DesktopFileEntryKey, "X-Created-By", EntryValueType::String).toString();
 }
 
+QString ApplicationService::desktopSourcePath() const noexcept
+{
+    return m_desktopSource.sourcePath();
+}
+
 bool ApplicationService::terminal() const noexcept
 {
     auto val = findEntryValue(DesktopFileEntryKey, "Terminal", EntryValueType::String);
@@ -1096,6 +1101,7 @@ void ApplicationService::resetEntry(DesktopEntry *newEntry) noexcept
     emit xDeepinCreatedByChanged();
     emit execsChanged();
     emit xCreatedByChanged();
+    emit desktopSourcePathChanged();
 }
 
 enum class SpliterState : uint8_t { Normal, InSingleQuote, InDoubleQuotes };

src/dbus/applicationservice.h

@@ -119,6 +119,9 @@ class ApplicationService : public QObject, protected QDBusContext
     Q_PROPERTY(QString X_CreatedBy READ X_CreatedBy NOTIFY xCreatedByChanged)
     [[nodiscard]] QString X_CreatedBy() const noexcept;
 
+    Q_PROPERTY(QString DesktopSourcePath READ desktopSourcePath NOTIFY desktopSourcePathChanged)
+    [[nodiscard]] QString desktopSourcePath() const noexcept;
+
     [[nodiscard]] QDBusObjectPath findInstance(const QString &instanceId) const;
 
     [[nodiscard]] const QString &getLauncher() const noexcept { return m_launcher; }
@@ -179,6 +182,7 @@ public Q_SLOTS:
     void xDeepinCreatedByChanged();
     void execsChanged();
     void xCreatedByChanged();
+    void desktopSourcePathChanged();
 
 private:
     friend class ApplicationManager1Service;