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/device/get-factory.md

@@ -0,0 +1,19 @@
+# D3D12Device::GetFactory
+
+```cpp
+IDXGIFactory4* GetFactory() const
+```
+
+获取底层 DXGI 工厂指针。
+
+**返回：** DXGI 工厂指针
+
+**示例：**
+
+```cpp
+IDXGIFactory4* factory = d3d12Device->GetFactory();
+```
+
+## 相关文档
+
+- [D3D12Device 总览](device.md) - 返回类总览