docs: update math API docs
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# Vector4::Vector4 (from Vector3)
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```cpp
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explicit Vector4(const Vector3& v, float w = 0.0f)
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```
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从 Vector3 构造四维向量,w 分量默认为 0.0f。
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**参数:**
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- `v` - 源 Vector3 向量
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- `w` - W 分量(默认值为 `0.0f`)
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**返回:** 新创建的 Vector4 实例
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**示例:**
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```cpp
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Vector3 v3(1.0f, 2.0f, 3.0f);
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Vector4 v4a(v3);
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Vector4 v4b(v3, 1.0f);
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```
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## 相关文档
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- [Vector4 总览](vector4.md) - 返回类总览
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