feat(extensions): 添加数组扩展方法支持二维数组边界检查

- 实现 IsInBounds 扩展方法用于检查二维数组坐标边界
- 提供泛型支持以适配不同类型的二维数组
- 包含完整的 XML 文档注释说明方法用途和参数
- 遵循 Apache 2.0 开源协议规范添加版权头文件

GFramework.Core/Extensions/ArrayExtensions.cs

@@ -0,0 +1,35 @@
+// Copyright (c) 2026 GeWuYou
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+// 
+//     http://www.apache.org/licenses/LICENSE-2.0
+// 
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+namespace GFramework.Core.Extensions;
+
+/// <summary>
+/// 数组扩展方法类，提供二维数组的边界检查等实用功能。
+/// </summary>
+public static class ArrayExtensions
+{
+    /// <summary>
+    /// 检查二维数组的给定坐标是否在有效边界内。
+    /// </summary>
+    /// <typeparam name="T">数组元素类型。</typeparam>
+    /// <param name="array">要检查的二维数组。</param>
+    /// <param name="x">要检查的 X 坐标（第一维索引）。</param>
+    /// <param name="y">要检查的 Y 坐标（第二维索引）。</param>
+    /// <returns>如果坐标在数组边界内则返回 true；否则返回 false。</returns>
+    public static bool IsInBounds<T>(this T[,] array, int x, int y)
+    {
+        return x >= 0 && y >= 0 &&
+               x < array.GetLength(0) &&
+               y < array.GetLength(1);
+    }
+}