fix: 修复 manifest.coin 缺失导致菜单不显示，新增安装脚本和入口文件

Better-EN5/Better-EN5.csproj

@@ -19,4 +19,7 @@
   <ItemGroup>
     <PackageReference Include="dotnetCampus.EasiPlugin.Sdk" Version="2.1.1-alpha.3" />
   </ItemGroup>
+  <Target Name="CopyManifest" AfterTargets="AfterBuild">
+    <Copy SourceFiles="manifest.coin" DestinationFolder="$(OutDir)" SkipUnchangedFiles="true" />
+  </Target>
 </Project>

安装插件.bat

@@ -0,0 +1,68 @@
+@echo off
+title Better-Seewo 插件安装
+cd /d "%~dp0"
+
+:: 检查管理员权限
+net session >nul 2>&1
+if %errorLevel% neq 0 (
+    echo 正在请求管理员权限...
+    powershell start-process "%~f0" -verb runas
+    exit /b
+)
+
+echo ========================================
+echo   Better-Seewo 增强插件 v1.1.1 安装
+echo   雾启工作室
+echo ========================================
+echo.
+
+:: 设置 dotnet 路径
+set PATH=C:\Program Files\dotnet;%PATH%
+
+:: 构建
+echo [1/3] 构建项目...
+dotnet build -c Release Better-EN5
+if %errorLevel% neq 0 (
+    echo 构建失败！
+    pause
+    exit /b 1
+)
+echo 构建成功
+echo.
+
+:: 查找希沃白板安装目录
+echo [2/3] 查找希沃白板安装目录...
+set "seewoRoot=%ProgramFiles(x86)%\Seewo\EasiNote5"
+if not exist "%seewoRoot%" (
+    echo 未找到希沃白板安装目录！
+    pause
+    exit /b 1
+)
+
+for /f "tokens=*" %%d in ('dir "%seewoRoot%\EasiNote5_*" /b /o-n') do (
+    set "versionDir=%seewoRoot%\%%d"
+    goto :found
+)
+echo 未找到希沃白板版本目录！
+pause
+exit /b 1
+
+:found
+set "targetDir=%versionDir%\Main\Extensions\Better-EN5"
+echo 安装到: %targetDir%
+
+:: 创建目标目录
+if not exist "%targetDir%" mkdir "%targetDir%"
+
+:: 复制文件
+echo [3/3] 复制插件文件...
+xcopy "Better-EN5\bin\Release\net6.0-windows\*" "%targetDir%\" /y /q
+copy /y "Better-EN5\manifest.coin" "%targetDir%\" >nul
+
+echo.
+echo ========================================
+echo   安装完成！
+echo   请重启希沃白板以加载插件。
+echo ========================================
+echo.
+pause