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/shutdown.md

@@ -0,0 +1,26 @@
+# Logger::Shutdown
+
+```cpp
+void Shutdown()
+```
+
+关闭日志系统。移除所有注册的 Sink，刷新缓冲区并重置内部状态。在程序退出前调用，确保所有日志数据已写入输出目标。
+
+**复杂度：** O(n)，n 为注册的 Sink 数量
+
+**示例：**
+
+```cpp
+#include <XCEngine/Debug/Logger.h>
+
+int main() {
+    XCEngine::Debug::Logger::Get().Initialize();
+    // ... 应用逻辑 ...
+    XCEngine::Debug::Logger::Get().Shutdown();
+    return 0;
+}
+```
+
+## 相关文档
+
+- [Logger 总览](logger.md) - 返回类总览