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/LogViewer.h

@@ -0,0 +1,46 @@
+#ifndef LOGVIEWER_H
+#define LOGVIEWER_H
+
+#include <QWidget>
+#include <QTextEdit>
+#include <QComboBox>
+#include <QPushButton>
+#include <QLineEdit>
+#include <QLabel>
+#include <QCheckBox>
+
+class LogViewer : public QWidget
+{
+    Q_OBJECT
+public:
+    explicit LogViewer(QWidget *parent = nullptr);
+    ~LogViewer() override = default;
+
+private slots:
+    void onFilterChanged(const QString &text);
+    void onLevelChanged(int index);
+    void onClear();
+    void onExport();
+    void onAutoScrollToggled(bool enabled);
+
+private:
+    void installMessageHandler();
+    void restoreMessageHandler();
+    static void logMessageHandler(QtMsgType type,
+                                   const QMessageLogContext &context,
+                                   const QString &msg);
+
+    QTextEdit *m_logView;
+    QLineEdit *m_filterEdit;
+    QComboBox *m_levelCombo;
+    QCheckBox *m_autoScroll;
+    QPushButton *m_clearBtn;
+    QPushButton *m_exportBtn;
+    QLabel *m_countLabel;
+    int m_logCount = 0;
+
+    static LogViewer *s_instance;
+    static QtMessageHandler s_oldHandler;
+};
+
+#endif