fix: improve doc link navigation and tree display

- Fix link resolution with proper relative/absolute path handling
- Improve link styling with underline decoration
- Hide leaf nodes from tree, only show directories
- Fix log file path for packaged app

docs/api/math/vector4/tovector3.md

@@ -0,0 +1,18 @@
+# Vector4::ToVector3
+
+```cpp
+Vector3 ToVector3() const
+```
+
+将 Vector4 转换为 Vector3，丢弃 w 分量。
+
+**返回：** `Vector3` - 转换后的 Vector3 (x, y, z)
+
+**复杂度：** O(1)
+
+**示例：**
+
+```cpp
+Vector4 pos4(1.0f, 2.0f, 3.0f, 1.0f);
+Vector3 pos3 = pos4.ToVector3();  // (1, 2, 3)
+```