feat: 添加GPU切换模式检测和主副显标识

- C++后端：GpuInfo添加isPrimary字段，读取boot_vga判断主副显
- C++后端：detectGpuMode()检测PRIME/Bumblebee/Solo/Hybrid模式
- C++后端：新增gpuMode和gpuPrimary属性
- QML前端：卡片显示绿色主显标签（boot_vga=1的GPU）
- QML前端：弹窗显示GPU模式标签(PRIME等)和帮助图标
- 帮助图标悬停显示模式说明文字
- 翻译更新：主显/主顯 + 四种模式的中文说明

graphicsdriverapplet.cpp

@@ -63,6 +63,16 @@ QStringList GraphicsDriverApplet::gpuStats() const
     return m_gpuStats;
 }
 
+QString GraphicsDriverApplet::gpuMode() const
+{
+    return m_gpuMode;
+}
+
+QStringList GraphicsDriverApplet::gpuPrimary() const
+{
+    return m_gpuPrimary;
+}
+
 void GraphicsDriverApplet::refreshDeviceInfo()
 {
     detectGpus();
@@ -87,6 +97,7 @@ void GraphicsDriverApplet::detectGpus()
             GpuInfo gpu;
             // 初始化统计字段
             gpu.drmCard = -1;
+            gpu.isPrimary = false;
             gpu.temperature = -1;
             gpu.gpuUsage = -1;
             gpu.memUsage = -1;
@@ -119,6 +130,12 @@ void GraphicsDriverApplet::detectGpus()
             // 查找 DRM 卡号
             gpu.drmCard = findDrmCard(gpu.pciId);
 
+            // 读取 boot_vga 判断主副显
+            QFile bootVgaFile("/sys/bus/pci/devices/0000:" + gpu.pciId + "/boot_vga");
+            if (bootVgaFile.open(QIODevice::ReadOnly | QIODevice::Text)) {
+                gpu.isPrimary = QTextStream(&bootVgaFile).readAll().trimmed() == "1";
+            }
+
             m_gpus.append(gpu);
         }
     }
@@ -146,16 +163,27 @@ void GraphicsDriverApplet::detectGpus()
     m_gpuSummary = parts.join("  |  ");
     m_ready = !m_gpus.isEmpty();
 
+    // 生成主副显标识
+    m_gpuPrimary.clear();
+    for (const GpuInfo &gpu : m_gpus) {
+        m_gpuPrimary << (gpu.isPrimary ? "true" : "false");
+    }
+
     qDebug() << "Detected GPUs:" << m_deviceInfo;
     qDebug() << "Current drivers:" << m_currentDriver;
 
     emit deviceInfoChanged();
     emit currentDriverChanged();
     emit gpuSummaryChanged();
+    emit gpuStatsChanged();
+    emit gpuPrimaryChanged();
     emit readyChanged();
 
     // 读取实时统计信息
     readGpuStats();
+
+    // 检测 GPU 切换模式
+    detectGpuMode();
 }
 
 QStringList GraphicsDriverApplet::runCommand(const QString &cmd, const QStringList &args)
@@ -238,6 +266,44 @@ QString GraphicsDriverApplet::readDriverVersion(const QString &driverName)
     return QString();
 }
 
+void GraphicsDriverApplet::detectGpuMode()
+{
+    // 单 GPU
+    if (m_gpus.size() <= 1) {
+        m_gpuMode = "Solo";
+        emit gpuModeChanged();
+        return;
+    }
+
+    // 多 GPU：检测 PRIME / Bumblebee
+    // PRIME: nvidia-drm-outputclass.conf 存在
+    if (QFile::exists("/usr/share/X11/xorg.conf.d/nvidia-drm-outputclass.conf") ||
+        QFile::exists("/etc/X11/xorg.conf.d/70-nvidia.conf")) {
+        m_gpuMode = "PRIME";
+        emit gpuModeChanged();
+        return;
+    }
+
+    // Bumblebee: 检查 bumblebeed 服务
+    QStringList lsmod = runCommand("lsmod", {});
+    bool bumblebeeLoaded = false;
+    for (const QString &line : lsmod) {
+        if (line.contains("bumblebee", Qt::CaseInsensitive)) {
+            bumblebeeLoaded = true;
+            break;
+        }
+    }
+    if (bumblebeeLoaded || QFile::exists("/usr/sbin/bumblebeed")) {
+        m_gpuMode = "Bumblebee";
+        emit gpuModeChanged();
+        return;
+    }
+
+    // 多 GPU 但无已知切换方案
+    m_gpuMode = "Hybrid";
+    emit gpuModeChanged();
+}
+
 int GraphicsDriverApplet::findDrmCard(const QString &pciId)
 {
     // 扫描 /sys/bus/pci/devices/0000:XX:XX.X/drm/ 目录，找到 cardN 条目