fix: improve doc link navigation and tree display

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docs/api/math/quaternion/tomatrix4x4.md

@@ -0,0 +1,18 @@
+# Quaternion::ToMatrix4x4
+
+```cpp
+Matrix4x4 ToMatrix4x4() const
+```
+
+将四元数转换为 4x4 旋转矩阵。
+
+**返回：** `Matrix4x4` - 旋转矩阵
+
+**复杂度：** O(1)
+
+**示例：**
+
+```cpp
+Quaternion rot = ...;
+Matrix4 mat = rot.ToMatrix4x4();
+```