feat: Better-Seewo v2.0.0 - 希沃白板功能增强插件

- Fluent Design 风格 UI，深色/浅色主题切换
- 平滑过渡动画（页面切换、按钮交互、状态变化）
- 五大核心功能：安装管理、墨迹管理、格式转换、触摸设置、激活管理
- 基于 dotnetCampus.EasiPlugin.Sdk v2.1.1-alpha.3 插件框架
- WPF 安装向导（欢迎页 -> 安装页 -> 完成页）

Better-Seewo.sln

@@ -0,0 +1,37 @@
+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 17
+VisualStudioVersion = 17.0.31903.59
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Better-EN5", "Better-EN5\Better-EN5.csproj", "{A1B2C3D4-E5F6-7890-ABCD-EF1234567890}"
+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Manager", "Manager\Manager.csproj", "{B2C3D4E5-F678-90AB-CDEF-123456789ABC}"
+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Installer", "Installer\Installer.csproj", "{C3D4E5F6-7890-ABCD-EF12-3456789ABC01}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{A1B2C3D4-E5F6-7890-ABCD-EF1234567890}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{A1B2C3D4-E5F6-7890-ABCD-EF1234567890}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{A1B2C3D4-E5F6-7890-ABCD-EF1234567890}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{A1B2C3D4-E5F6-7890-ABCD-EF1234567890}.Release|Any CPU.Build.0 = Release|Any CPU
+		{B2C3D4E5-F678-90AB-CDEF-123456789ABC}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{B2C3D4E5-F678-90AB-CDEF-123456789ABC}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{B2C3D4E5-F678-90AB-CDEF-123456789ABC}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{B2C3D4E5-F678-90AB-CDEF-123456789ABC}.Release|Any CPU.Build.0 = Release|Any CPU
+		{C3D4E5F6-7890-ABCD-EF12-3456789ABC01}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{C3D4E5F6-7890-ABCD-EF12-3456789ABC01}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{C3D4E5F6-7890-ABCD-EF12-3456789ABC01}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{C3D4E5F6-7890-ABCD-EF12-3456789ABC01}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {D4E5F678-90AB-CDEF-1234-56789ABCDEF0}
+	EndGlobalSection
+EndGlobal