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/plane/getside.md

@@ -0,0 +1,20 @@
+# Plane::GetSide
+
+```cpp
+bool GetSide(const Vector3& point) const
+```
+
+判断点在平面的哪一侧。
+
+**参数：**
+- `point` - 要测试的点
+
+**返回：** `bool` - true 表示点在法线方向一侧
+
+**复杂度：** O(1)
+
+**示例：**
+
+```cpp
+if (plane.GetSide(point)) { /* point is on normal side */ }
+```