Update API documentation and remove obsolete plan files
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docs/api/math/vector2/operator-mul-assign.md
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# Vector2::operator*=
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```cpp
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Vector2& operator*=(float scalar)
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```
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向量乘法赋值,将当前向量乘以标量。
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**参数:**
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- `scalar` - 标量值
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**返回:** `Vector2&` - 引用到修改后的当前向量
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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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Vector2 v(2.0f, 3.0f);
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v *= 2.0f; // v = (4.0f, 6.0f)
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```
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## 相关文档
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- [Vector2 总览](vector2.md)
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- [`operator*`](operator-mul.md) - 乘法
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- [`operator/=`](operator-div-assign.md) - 除法赋值
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