Please address the comments from this code review:
## Individual Comments

### Comment 1
<location> `panels/dock/showdesktop/showdesktop.cpp:32` </location>
<code_context>
+    // 创建DConfig实例来读取dock配置
+    m_dockConfig = DConfig::create("org.deepin.dde.shell", "org.deepin.ds.dock", QString(), this);
+    
+    if (m_dockConfig) {
+        // 监听配置变化
+        connect(m_dockConfig, &DConfig::valueChanged, this, [this](const QString &key) {
+            if (key == "Enable_ShowDesktop") {
+                onEnableShowDesktopChanged();
+            }
+        });
+    }
</code_context>

<issue_to_address>
Consider handling DConfig initialization failure more explicitly.

If m_dockConfig is null, consider logging a warning or handling the failure to improve visibility and debugging of configuration issues.
</issue_to_address>

<suggested_fix>
<<<<<<< SEARCH
    m_dockConfig = DConfig::create("org.deepin.dde.shell", "org.deepin.ds.dock", QString(), this);

    if (m_dockConfig) {
        // 监听配置变化
        connect(m_dockConfig, &DConfig::valueChanged, this, [this](const QString &key) {
            if (key == "Enable_ShowDesktop") {
                onEnableShowDesktopChanged();
            }
        });
    }
=======
    m_dockConfig = DConfig::create("org.deepin.dde.shell", "org.deepin.ds.dock", QString(), this);

    if (m_dockConfig) {
        // 监听配置变化
        connect(m_dockConfig, &DConfig::valueChanged, this, [this](const QString &key) {
            if (key == "Enable_ShowDesktop") {
                onEnableShowDesktopChanged();
            }
        });
    } else {
        qWarning() << "Failed to initialize DConfig for ShowDesktop: dock config is null.";
    }
>>>>>>> REPLACE

</suggested_fix>

### Comment 2
<location> `panels/dock/showdesktop/showdesktop.cpp:23` </location>
<code_context>
 ShowDesktop::ShowDesktop(QObject *parent)
     : DApplet(parent)
     , m_windowManager(nullptr)
</code_context>

<issue_to_address>
Consider replacing the raw DConfig pointer and separate slot with an in-place DConfig member and a single lambda to update visibility.

Consider ditching the raw `DConfig*` + validity checks + extra slot and just keep a `DConfig` member initialized in-place, read the default once, and hook one lambda to update your `m_visible`. You can collapse ctor + init into:

```cpp
// showdesktop.h
class ShowDesktop : public DApplet {
    Q_OBJECT
    Q_PROPERTY(bool visible READ visible WRITE setVisible NOTIFY visibleChanged)
public:
    explicit ShowDesktop(QObject *parent = nullptr);

    bool visible() const { return m_visible; }
    void setVisible(bool v) {
        if (m_visible == v) return;
        m_visible = v;
        Q_EMIT visibleChanged();
    }

signals:
    void visibleChanged();

private:
    DConfig m_dockConfig{"org.deepin.dde.shell", "org.deepin.ds.dock"};
    bool    m_visible{true};
};
```

```cpp
// showdesktop.cpp
ShowDesktop::ShowDesktop(QObject *parent)
    : DApplet(parent)
    , m_visible(m_dockConfig.value("Enable_ShowDesktop", true).toBool())
{
    // One shot: emit initial state
    Q_EMIT visibleChanged();

    // Update on config change
    connect(&m_dockConfig, &DConfig::valueChanged, this, [this](const QString &key) {
        if (key == QLatin1String("Enable_ShowDesktop")) {
            setVisible(m_dockConfig.value(key, true).toBool());
        }
    });

    DApplet::init();
}
```

This:

- Removes the raw pointer + `.isValid()` guards
- Inlines the “read default” & “watch for changes” in one place
- Eliminates a separate `onEnableShowDesktopChanged()` slot  
- Keeps all existing behavior intact but cuts ~20 lines of boilerplate.
</issue_to_address>