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/quaternion/toeulerangles.md

@@ -0,0 +1,18 @@
+# Quaternion::ToEulerAngles
+
+```cpp
+Vector3 ToEulerAngles() const
+```
+
+将四元数转换为欧拉角（弧度）。
+
+**返回：** `Vector3` - 欧拉角 (pitch, yaw, roll)
+
+**复杂度：** O(1)
+
+**示例：**
+
+```cpp
+Quaternion rot = ...;
+Vector3 euler = rot.ToEulerAngles();
+```