docs: 更新 resources, rhi, scene 模块及新增 camera-component 方法文档

- resources: 更新 asyncloader, audioclip, mesh-import-settings, texture-loader 文档
- rhi: 更新 opengl render-target-view 文档
- components: 新增 camera-component 全部方法文档 (15个文件)
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# GetOrthographicSize
**所属类**: `CameraComponent`
**头文件**: `XCEngine/Components/CameraComponent.h`
**描述**: 获取摄像机的正交投影大小(仅在正交投影模式下有效)。
## 函数签名
```cpp
float GetOrthographicSize() const;
```
## 返回值
| 类型 | 描述 |
|------|------|
| `float` | 正交投影大小,默认值为 5.0 |
## 使用示例
```cpp
#include <XCEngine/Components/CameraComponent.h>
using namespace XCEngine::Components;
void PrintOrthoSize(CameraComponent* camera) {
float size = camera->GetOrthographicSize();
printf("Orthographic size: %.2f\n", size);
}
```
## 相关文档
- [CameraComponent](camera-component.md) - 摄像机组件
- [SetOrthographicSize](set-orthographic-size.md) - 设置正交大小