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/command-list/set-viewport.md

@@ -0,0 +1,16 @@
+# D3D12CommandList::SetViewport
+
+```cpp
+void SetViewport(const Viewport& viewport) override;
+```
+
+设置视口。
+
+**参数：**
+- `viewport` - 视口结构
+
+**复杂度：** O(1)
+
+## 相关文档
+
+- [D3D12CommandList 总览](command-list.md) - 返回类总览