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/factory/create-rhi-device-string.md

@@ -0,0 +1,31 @@
+# RHIFactory::CreateRHIDevice (string)
+
+```cpp
+static RHIDevice* CreateRHIDevice(const std::string& typeName);
+```
+
+根据字符串名称创建 RHI 设备。
+
+**参数：**
+- `typeName` - 后端类型名称字符串（不区分大小写）
+
+**返回：** 新创建的设备指针，失败返回 `nullptr`
+
+**复杂度：** O(1)
+
+**支持的类型名称：**
+- `"D3D12"` / `"d3d12"`
+- `"OpenGL"` / `"opengl"` / `"GL"`
+- Vulkan 和 Metal 暂不支持
+
+**示例：**
+
+```cpp
+// 从配置文件读取后端类型
+std::string backendType = "D3D12";
+RHIDevice* device = RHIFactory::CreateRHIDevice(backendType);
+```
+
+## 相关文档
+
+- [RHIFactory 总览](factory.md) - 返回类总览