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/vector3/angle.md

@@ -0,0 +1,23 @@
+# Vector3::Angle
+
+```cpp
+static float Angle(const Vector3& from, const Vector3& to)
+```
+
+计算两个向量之间的夹角（以度为单位）。
+
+**参数：**
+- `from` - 起始向量
+- `to` - 目标向量
+
+**返回：** `float` - 两向量之间的夹角（0-180度）
+
+**复杂度：** O(1)
+
+**示例：**
+
+```cpp
+Vector3 a(1.0f, 0.0f, 0.0f);
+Vector3 b(0.0f, 1.0f, 0.0f);
+float angle = Vector3::Angle(a, b);  // 90.0f
+```