docs: fix debug module documentation discrepancies

- Changed include path in debug.md from Logger.h to Debug.h (umbrella header)
- Added XE_ASSERT example in debug.md usage section
- Added documentation for Profiler private types (ProfileNode, ProfileSample)
- Added documentation for Profiler member variables (m_profileStack, m_samples, m_frameStartTime, m_initialized)
- Verified MarkEvent, SetMarker, ExportChromeTracing are correctly marked as stubs

docs/api/debug/debug.md

@@ -59,7 +59,7 @@ Debug 模块提供了一套完整的调试工具，包括日志系统和性能
 ## 使用示例
 
 ```cpp
-#include <XCEngine/Debug/Logger.h>
+#include <XCEngine/Debug/Debug.h>
 
 // 初始化日志系统
 Logger::Get().Initialize();
@@ -76,6 +76,9 @@ XE_LOG(LogCategory::Rendering, LogLevel::Info, "Render started");
 if (condition) {
     XE_LOG(LogCategory::General, LogLevel::Error, "Something went wrong");
 }
+
+// 使用断言
+XE_ASSERT(ptr != nullptr, "Pointer must not be null");
 ```
 
 ## 相关文档