docs: update math API docs
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docs/api/math/bounds/bounds.constructors.md
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# Bounds::Bounds
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```cpp
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Bounds()
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Bounds(const Vector3& center, const Vector3& size)
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```
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构造一个 Bounds 对象。默认构造函数创建中心为原点、范围为零的包围盒。
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**参数:**
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- `center` - 包围盒的中心点
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- `size` - 包围盒的完整尺寸(非 extents,构造时会自动除以 2)
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**返回:** 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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#include <XCEngine/Math/Bounds.h>
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#include <XCEngine/Math/Vector3.h>
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using namespace XCEngine::Math;
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// 默认构造
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Bounds empty;
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Bounds bounds(Vector3(0.0f, 0.0f, 0.0f), Vector3(2.0f, 2.0f, 2.0f));
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// center = (0,0,0), extents = (1,1,1), 实际尺寸为 2x2x2
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```
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## 相关文档
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- [Bounds](bounds.md) - 返回类总览
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- [GetMin](getmin.md) - 获取最小点
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- [GetMax](getmax.md) - 获取最大点
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