fix: improve doc link navigation and tree display

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docs/api/math/frustum/contains-sphere.md

@@ -0,0 +1,24 @@
+# Frustum::Contains (sphere)
+
+```cpp
+bool Contains(const Sphere& sphere) const
+```
+
+检测球体是否完全在视锥体内。
+
+**参数：**
+- `sphere` - 要检测的球体
+
+**返回：** `bool` - 球体完全在视锥内返回 true
+
+**复杂度：** O(1)
+
+**示例：**
+
+```cpp
+Frustum frustum = camera.CalculateFrustum();
+Sphere collider = object.GetBoundingSphere();
+if (frustum.Contains(collider)) {
+    // 球体完全在视锥内
+}
+```