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/opengl/render-target-view/get-mip-level.md

@@ -0,0 +1,19 @@
+# OpenGLRenderTargetView::GetMipLevel
+
+```cpp
+int GetMipLevel() const
+```
+
+获取 mipmap 级别。
+
+**返回：** `int` - mip 级别
+
+**示例：**
+
+```cpp
+int mipLevel = rtv.GetMipLevel();
+```
+
+## 相关文档
+
+- [OpenGLRenderTargetView](render-target-view.md) - 返回类总览