fix: improve doc link navigation and tree display

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docs/api/math/vector3/quaternion-multiply.md

@@ -0,0 +1,23 @@
+# Vector3 * Quaternion
+
+```cpp
+Vector3 operator*(const Quaternion& q, const Vector3& v)
+```
+
+用四元数旋转向量。
+
+**参数：**
+- `q` - 旋转四元数
+- `v` - 要旋转的向量
+
+**返回：** `Vector3` - 旋转后的向量
+
+**复杂度：** O(1)
+
+**示例：**
+
+```cpp
+Quaternion rot = Quaternion::FromEulerAngles(0.0f, 90.0f * DEG_TO_RAD, 0.0f);
+Vector3 forward = Vector3::Forward();
+Vector3 rotated = rot * forward;  // 绕 Y 轴旋转 90 度
+```