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/rhi/d3d12/buffer/get-native-handle.md

@@ -0,0 +1,19 @@
+# D3D12Buffer::GetNativeHandle
+
+## 函数签名
+
+```cpp
+void* GetNativeHandle() override
+```
+
+## 中文描述
+
+返回原生句柄，即 `ID3D12Resource*`。
+
+## 返回值
+
+`void*` - 原生句柄
+
+## 复杂度
+
+O(1)