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/profiler/beginframe.md

@@ -0,0 +1,26 @@
+# Profiler::BeginFrame
+
+```cpp
+void BeginFrame()
+```
+
+开始一帧的性能分析。记录当前帧的起始时间戳，用于计算帧级别的性能指标。应在每帧渲染开始时调用。
+
+**复杂度：** O(1)
+
+**示例：**
+
+```cpp
+#include <XCEngine/Debug/Profiler.h>
+
+void GameLoop() {
+    XCEngine::Debug::Profiler::Get().BeginFrame();
+    Update();
+    Render();
+    XCEngine::Debug::Profiler::Get().EndFrame();
+}
+```
+
+## 相关文档
+
+- [Profiler 总览](profiler.md) - 返回类总览