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/transform/transformdirection.md

@@ -0,0 +1,22 @@
+# Transform::TransformDirection
+
+```cpp
+Vector3 TransformDirection(const Vector3& direction) const
+```
+
+变换方向（仅旋转，包含缩放）。
+
+**参数：**
+- `direction` - 要变换的方向
+
+**返回：** `Vector3` - 变换后的方向
+
+**复杂度：** O(1)
+
+**示例：**
+
+```cpp
+Transform t;
+Vector3 localDir(1.0f, 0.0f, 0.0f);
+Vector3 worldDir = t.TransformDirection(localDir);
+```