fix: improve doc link navigation and tree display

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docs/api/math/rect/intersect.md

@@ -0,0 +1,23 @@
+# Rect::Intersect
+
+```cpp
+static Rect Intersect(const Rect& a, const Rect& b)
+```
+
+计算两矩形的交集区域。
+
+**参数：**
+- `a` - 第一个矩形
+- `b` - 第二个矩形
+
+**返回：** `Rect` - 两矩形的交集，若无交集则返回零尺寸矩形
+
+**复杂度：** O(1)
+
+**示例：**
+
+```cpp
+Rect rectA(0.0f, 0.0f, 100.0f, 100.0f);
+Rect rectB(50.0f, 50.0f, 100.0f, 100.0f);
+Rect overlap = Rect::Intersect(rectA, rectB);  // (50, 50, 50, 50)
+```