fix: improve doc link navigation and tree display

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docs/api/math/vector3/dot.md

@@ -0,0 +1,23 @@
+# Vector3::Dot
+
+```cpp
+static float Dot(const Vector3& a, const Vector3& b)
+```
+
+计算两个 3D 向量的点积。
+
+**参数：**
+- `a` - 第一个向量
+- `b` - 第二个向量
+
+**返回：** `float` - 点积结果 a.x * b.x + a.y * b.y + a.z * b.z
+
+**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 dot = Vector3::Dot(a, b);  // 0.0f
+```