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

Plugins/Logging/LoggingPlugin.h

@@ -0,0 +1,29 @@
+#ifndef LOGGINGPLUGIN_H
+#define LOGGINGPLUGIN_H
+
+#include "IPlugin.h"
+#include <QIcon>
+#include <QWidget>
+
+class LoggingPlugin : public QObject, public IPlugin
+{
+    Q_OBJECT
+    Q_PLUGIN_METADATA(IID "com.gcs.IPlugin/3.0" FILE "plugin.json")
+    Q_INTERFACES(IPlugin)
+
+public:
+    QString name()        const override { return QStringLiteral("logging"); }
+    QString title()       const override { return QStringLiteral("Logging"); }
+    QString version()     const override { return QStringLiteral("2.0.0"); }
+    QString description() const override { return QStringLiteral("Unified logging system with viewer"); }
+    QIcon   icon()        const override { return {}; }
+
+    bool initialize(PluginContext *) override;
+    void onActivated()   override {}
+    void onDeactivated() override {}
+    void onClose()       override {}
+
+    QWidget *createWidget(QWidget *parent = nullptr) override;
+};
+
+#endif