feat(app): 初始化 OmniNotify 测试工具

创建基于 .NET 8 WPF 的桌面测试程序，支持配置通知接口、频道、标题和正文，并通过内置模板快速发送不同类型的测试消息。

实现服务检测、单次发送、自动定时发送、模板轮换、批量发送、非法频道切换和发送日志记录，便于验证 OmniNotify 本地消息 API 的基础行为与异常场景。

Initial-Commit: true

AssemblyInfo.cs

@@ -0,0 +1,10 @@
+using System.Windows;
+
+[assembly:ThemeInfo(
+    ResourceDictionaryLocation.None,            //where theme specific resource dictionaries are located
+                                                //(used if a resource is not found in the page,
+                                                // or application resource dictionaries)
+    ResourceDictionaryLocation.SourceAssembly   //where the generic resource dictionary is located
+                                                //(used if a resource is not found in the page,
+                                                // app, or any theme specific resource dictionaries)
+)]