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/core/CommandRegistry.cpp

@@ -0,0 +1,50 @@
+#include "CommandRegistry.h"
+
+CommandRegistry::CommandRegistry(QObject *parent) : QObject(parent) {}
+
+void CommandRegistry::registerCommand(const QString &name, const QString &description,
+                                       const QString &pluginName, int commandId)
+{
+    CommandEntry entry;
+    entry.name = name;
+    entry.description = description;
+    entry.pluginName = pluginName;
+    entry.commandId = commandId;
+    entry.enabled = true;
+    m_commands.insert(name, entry);
+    emit commandRegistered(name);
+}
+
+void CommandRegistry::unregisterCommand(const QString &name)
+{
+    if (m_commands.remove(name))
+        emit commandUnregistered(name);
+}
+
+void CommandRegistry::setCommandEnabled(const QString &name, bool enabled)
+{
+    if (m_commands.contains(name)) {
+        m_commands[name].enabled = enabled;
+        emit commandEnabledChanged(name, enabled);
+    }
+}
+
+QStringList CommandRegistry::commandNames() const
+{
+    return m_commands.keys();
+}
+
+CommandEntry CommandRegistry::command(const QString &name) const
+{
+    return m_commands.value(name);
+}
+
+bool CommandRegistry::hasCommand(const QString &name) const
+{
+    return m_commands.contains(name);
+}
+
+int CommandRegistry::commandCount() const
+{
+    return m_commands.size();
+}

App/core/CommandRegistry.h

@@ -0,0 +1,41 @@
+#ifndef COMMANDREGISTRY_H
+#define COMMANDREGISTRY_H
+
+#include <QObject>
+#include <QMap>
+#include <QStringList>
+
+struct CommandEntry {
+    QString name;
+    QString description;
+    QString pluginName;
+    int commandId = 0;
+    bool enabled = true;
+};
+
+class CommandRegistry : public QObject
+{
+    Q_OBJECT
+public:
+    explicit CommandRegistry(QObject *parent = nullptr);
+
+    void registerCommand(const QString &name, const QString &description,
+                         const QString &pluginName, int commandId = 0);
+    void unregisterCommand(const QString &name);
+    void setCommandEnabled(const QString &name, bool enabled);
+
+    QStringList commandNames() const;
+    CommandEntry command(const QString &name) const;
+    bool hasCommand(const QString &name) const;
+    int commandCount() const;
+
+signals:
+    void commandRegistered(const QString &name);
+    void commandUnregistered(const QString &name);
+    void commandEnabledChanged(const QString &name, bool enabled);
+
+private:
+    QMap<QString, CommandEntry> m_commands;
+};
+
+#endif