docs: update RHI API docs

docs/api/rhi/opengl/pipeline-state/get-native-handle.md

@@ -0,0 +1,26 @@
+# OpenGLPipelineState::GetNativeHandle
+
+```cpp
+void* GetNativeHandle() override;
+```
+
+获取 OpenGL shader program 的原生句柄。
+
+**返回：** 
+- OpenGL: `void*` 指向 `GLuint` 类型的 program 值
+
+**线程安全：** ✅
+
+**复杂度：** O(1)
+
+**示例：**
+
+```cpp
+void* handle = pipelineState->GetNativeHandle();
+GLuint program = static_cast<GLuint>(reinterpret_cast<uintptr_t>(handle));
+```
+
+## 相关文档
+
+- [OpenGLPipelineState 总览](pipeline-state.md) - 返回类总览
+- [AttachShader](attach-shader.md) - 附加着色器