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/debug.md

@@ -0,0 +1,30 @@
+# Logger::Debug
+
+```cpp
+void Debug(LogCategory category, const Containers::String& message)
+```
+
+记录一条 Debug（1 级）日志。Debug 级别用于一般调试信息，比 Verbose 简洁但比 Info 详细。
+
+**参数：**
+- `category` - 日志分类
+- `message` - 日志消息内容
+
+**返回：** 无
+
+**复杂度：** O(n)，n 为注册的 Sink 数量
+
+**示例：**
+
+```cpp
+#include <XCEngine/Debug/Logger.h>
+
+XCEngine::Debug::Logger::Get().Debug(
+    XCEngine::Debug::LogCategory::Rendering,
+    "Draw call batch size: 512"
+);
+```
+
+## 相关文档
+
+- [Logger 总览](logger.md) - 返回类总览