fix: improve doc link navigation and tree display

- Fix link resolution with proper relative/absolute path handling
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docs/api/math/matrix4/gettranslation.md

@@ -0,0 +1,18 @@
+# Matrix4::GetTranslation
+
+```cpp
+Vector3 GetTranslation() const
+```
+
+从矩阵中提取平移分量。
+
+**返回：** `Vector3` - 平移向量
+
+**复杂度：** O(1)
+
+**示例：**
+
+```cpp
+Matrix4 m = ...;
+Vector3 translation = m.GetTranslation();
+```