docs: update resources API docs
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# IResource::GetMemorySize
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```cpp
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virtual size_t GetMemorySize() const = 0
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```
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获取资源占用的内存大小。纯虚方法,由具体资源类实现,返回资源在内存中的字节数。
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**参数:** 无
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**返回:** `size_t` - 资源占用的内存大小(字节)
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**异常:** 无
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**线程安全:** ✅
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**复杂度:** O(1)
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**示例:**
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```cpp
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ResourceHandle<Mesh> mesh = ResourceManager::Get().Load<Mesh>("models/player.fbx");
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size_t size = mesh->GetMemorySize();
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// size == 内存占用字节数
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```
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## 相关文档
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- [IResource 总览](iresource.md) - 返回类总览
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