fix: 修复 release.bat 版本号读取问题

- 切换到脚本所在目录确保路径正确
- 使用 type | findstr 替代直接 findstr 读取文件
- 添加版本号读取失败的错误处理

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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

release.bat

@@ -1,5 +1,5 @@
 @echo off
-chcp 65001 >nul
+chcp 65001 >nul 2>&1
 setlocal EnableDelayedExpansion
 
 echo ========================================
@@ -7,6 +7,9 @@ echo   PackagingMallShipper - Release Tool
 echo ========================================
 echo.
 
+:: 切换到脚本所在目录
+cd /d "%~dp0"
+
 :: 检查 Inno Setup
 set "ISCC="
 if exist "C:\Program Files (x86)\Inno Setup 6\ISCC.exe" (
@@ -27,10 +30,18 @@ if "%ISCC%"=="" (
 )
 
 :: 读取当前版本号
-for /f "tokens=2 delims=<>" %%a in ('findstr /C:"<Version>" PackagingMallShipper\PackagingMallShipper.csproj') do (
+set "CURRENT_VERSION="
+for /f "tokens=2 delims=<>" %%a in ('type "PackagingMallShipper\PackagingMallShipper.csproj" ^| findstr "<Version>"') do (
     set "CURRENT_VERSION=%%a"
 )
 
+if "%CURRENT_VERSION%"=="" (
+    echo [Error] Could not read version from csproj file
+    echo.
+    pause
+    exit /b 1
+)
+
 echo [Info] Current version: %CURRENT_VERSION%
 echo.