feat(dconfig-editor): add copy field name in context menu

[mhduiy]

Summary

Add "copy field name" right-click menu option to copy the field key to clipboard in dde-dconfig-editor.

Changes

• Added copy field name action to the right-click context menu on the rightmost list
• Copies the field key name to clipboard on trigger
• Renamed copyAction to copyValueAction for clarity
• Added Chinese translation for the new menu item

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[deepin-ci-robot]

deepin pr auto review

★ 总体评分：95分

■ 【总体评价】

代码实现了右键菜单复制字段名功能，逻辑清晰且无安全风险
语法完全正确且符合规范，无扣分项

■ 【详细分析】

• 1.语法逻辑 完全正确✓

新增的菜单项创建与信号槽连接逻辑正确，Lambda表达式按值捕获key和按指针捕获clip，避免了悬空指针风险，menu与action的生命周期由Qt对象树自动管理
建议：保持当前实现方式

• 2.代码质量 良好✓

变量命名从copyAction重构为copyFieldAction和copyValueAction，语义更加明确，同时补充了对应的国际化翻译文件
建议：保持当前的命名规范和国际化处理习惯

• 3.代码性能 高效✓

仅在用户触发右键菜单时创建轻量级对象，剪贴板写入操作仅在点击时执行，无额外性能损耗
建议：无需优化

• 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
将配置项字段名写入剪贴板属于常规UI交互，输入源为函数传入的合法key参数，不涉及任何外部不可信输入处理、命令执行或内存越界操作
建议：无需额外安全加固

■ 【改进建议代码示例】

void Content::onCustomContextMenuRequested(QWidget *widget, const QString &appid, const QString &resource, const QString &subpath, const QString &key)
{
    QString value = "示例值";
    QString setCmd = "示例命令";

    QMenu *menu = new QMenu(widget);

    QAction *exportAction = menu->addAction(tr("export"));
    QAction *copyFieldAction = menu->addAction(tr("copy field name"));
    QAction *copyValueAction = menu->addAction(tr("copy value"));
    QAction *copyCmdAction = menu->addAction(tr("convert to cmd"));
    QAction *resetCmdAction = menu->addAction(tr("reset value"));

    QClipboard *clip = QApplication::clipboard();
    connect(copyFieldAction, &QAction::triggered, this, [clip, key] {
        clip->setText(key);
    });
    connect(copyValueAction, &QAction::triggered, this, [clip, value] {
        clip->setText(value);
    });
    connect(copyCmdAction, &QAction::triggered, this, [clip, setCmd] {
        clip->setText(setCmd);
    });

    menu->exec(QCursor::pos());
    delete menu;
}

[deepin-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: 18202781743, mhduiy

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