refactor(tests): 重构测试项目的全局引用配置

- 在 GodotYamlConfigLoaderTests 中添加 GFramework.Game.Config 引用
- 从 GodotYamlConfigTableSourceTests 中移除未使用的 System 引用
- 新增 GlobalUsings.cs 文件统一管理所有全局引用
- 将常用的系统命名空间配置为全局引用以减少重复导入
- 优化测试代码的引用管理和项目结构

GFramework.Godot.Tests/Config/GodotYamlConfigLoaderTests.cs

@@ -1,11 +1,7 @@
-using System;
-using System.Collections.Generic;
-using System.IO;
-using System.Linq;
 using System.Reflection;
 using System.Runtime.CompilerServices;
-using System.Threading.Tasks;
 using GFramework.Game.Abstractions.Config;
+using GFramework.Game.Config;
 using GFramework.Godot.Config;
 
 namespace GFramework.Godot.Tests.Config;
@@ -16,10 +12,6 @@ namespace GFramework.Godot.Tests.Config;
 [TestFixture]
 public sealed class GodotYamlConfigLoaderTests
 {
-    private string _resourceRoot = null!;
-    private string _testRoot = null!;
-    private string _userRoot = null!;
-
     /// <summary>
     ///     为每个测试准备独立的资源根目录与用户目录。
     /// </summary>
@@ -48,6 +40,10 @@ public sealed class GodotYamlConfigLoaderTests
         }
     }
 
+    private string _resourceRoot = null!;
+    private string _testRoot = null!;
+    private string _userRoot = null!;
+
     /// <summary>
     ///     验证导出态会把注册过的 YAML 与 schema 文本同步到运行时缓存，再交给底层加载器。
     /// </summary>

GFramework.Godot.Tests/Config/GodotYamlConfigTableSourceTests.cs

@@ -1,4 +1,3 @@
-using System;
 using GFramework.Godot.Config;
 
 namespace GFramework.Godot.Tests.Config;

GFramework.Godot.Tests/GlobalUsings.cs

@@ -0,0 +1,25 @@
+// Copyright (c) 2025 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.
+
+global using System;
+global using System.Collections.Generic;
+global using System.Linq;
+global using System.Threading;
+global using System.Threading.Tasks;
+global using System.Collections.Immutable;
+global using Microsoft.CodeAnalysis;
+global using NUnit.Framework;
+global using System.Globalization;
+global using System.IO;
+global using System.Text;
+global using System.Text.Json;