refactor(localization): 更新集成测试中的命名空间引用

- 添加对 GFramework.Core.Abstractions.Localization 的引用
- 确保测试文件能够访问本地化相关的抽象接口
- 为后续的本地化功能扩展做好准备
- 保持代码结构的一致性与可维护性

GFramework.Core.Tests/Localization/LocalizationIntegrationTests.cs

@@ -1,3 +1,4 @@
+using GFramework.Core.Abstractions.Localization;
 using GFramework.Core.Localization;
 
 namespace GFramework.Core.Tests.Localization;
@@ -5,9 +6,6 @@ namespace GFramework.Core.Tests.Localization;
 [TestFixture]
 public class LocalizationIntegrationTests
 {
-    private LocalizationManager? _manager;
-    private string _testDataPath = null!;
-
     [SetUp]
     public void Setup()
     {
@@ -25,6 +23,9 @@ public class LocalizationIntegrationTests
         _manager.Initialize();
     }
 
+    private LocalizationManager? _manager;
+    private string _testDataPath = null!;
+
     [Test]
     public void GetText_ShouldReturnEnglishText()
     {