fix: improve doc link navigation and tree display

- Fix link resolution with proper relative/absolute path handling
- Improve link styling with underline decoration
- Hide leaf nodes from tree, only show directories
- Fix log file path for packaged app

docs/api/debug/logger/get.md

@@ -0,0 +1,22 @@
+# Logger::Get
+
+```cpp
+static Logger& Get()
+```
+
+获取 `Logger` 单例实例。Logger 使用局部静态变量实现 Meyers' Singleton，确保线程安全且只初始化一次。
+
+**返回：** `Logger&` - 全局日志记录器实例的引用
+
+**复杂度：** O(1)
+
+**示例：**
+
+```cpp
+XCEngine::Debug::Logger& logger = XCEngine::Debug::Logger::Get();
+logger.Initialize();
+```
+
+## 相关文档
+
+- [Logger 总览](logger.md) - 返回类总览