fix: 修复启动白屏与地图崩溃问题

- SetUseOpenGL(false): QGLWidget 在当前系统不兼容，改用软件渲染
- ExtensionHost_v2: 添加 contributionRegistry() getter 修复空指针
- main.cpp: 两阶段启动 (show → QTimer::singleShot → initialize)
- mainwindow: 分离构造函数与 initialize()，结尾调用 onTabIndexChanged(3)
- 修复 Qt DLL 部署：使用 windeployqt 确保运行时库版本匹配

App/Plugins/PluginManagerDialog.h

@@ -0,0 +1,46 @@
+#ifndef PLUGINMANAGERDIALOG_H
+#define PLUGINMANAGERDIALOG_H
+
+#include <QDialog>
+#include <QTreeWidget>
+#include <QPushButton>
+#include <QLabel>
+
+class ExtensionHost;
+class PluginImporter;
+class ContributionRegistry;
+
+class PluginManagerDialog : public QDialog
+{
+    Q_OBJECT
+public:
+    explicit PluginManagerDialog(ExtensionHost *extHost,
+                                  ContributionRegistry *contribReg,
+                                  QWidget *parent = nullptr);
+    ~PluginManagerDialog() override = default;
+
+    void refreshPluginList();
+
+private slots:
+    void onActivatePlugin();
+    void onDeactivatePlugin();
+    void onImportPlugin();
+    void onRefresh();
+
+private:
+    void setupUi();
+    void updateButtonStates();
+
+    ExtensionHost *m_extHost;
+    ContributionRegistry *m_contribReg;
+    PluginImporter *m_importer;
+
+    QTreeWidget *m_treeWidget;
+    QPushButton *m_activateBtn;
+    QPushButton *m_deactivateBtn;
+    QPushButton *m_importBtn;
+    QPushButton *m_refreshBtn;
+    QLabel *m_statusLabel;
+};
+
+#endif