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/buffer/unbind.md

@@ -0,0 +1,17 @@
+# OpenGLBuffer::Unbind
+
+```cpp
+void Unbind() const;
+```
+
+解除绑定缓冲区。
+
+**示例：**
+
+```cpp
+buffer.Unbind();
+```
+
+## 相关文档
+
+- [OpenGLBuffer 总览](buffer.md) - 返回类总览