docs: 更新文档中的 .NET Framework 版本为 4.6.2

- 更新 README.md 中的技术栈、系统要求和编译输出路径
- 更新 BUILD_INSTALLER.md 中的兼容性说明和下载链接
- 更新轻量级订单发货客户端方案.md 中的所有版本引用
- 更新 build_installer.bat 自动编译和复制流程
- 修复 App.config 中的 supportedRuntime 版本

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

build_installer.bat

@@ -26,17 +26,35 @@ if "%ISCC%"=="" (
 echo [Info] Found Inno Setup: %ISCC%
 echo.
 
+echo [Step 1] Building Release version...
+dotnet build -c Release
+if %ERRORLEVEL% NEQ 0 (
+    echo [Error] Build failed!
+    pause
+    exit /b 1
+)
+echo.
+
+echo [Step 2] Copying files to publish folder...
+if not exist "publish" mkdir publish
+if not exist "publish\x64" mkdir publish\x64
+if not exist "publish\x86" mkdir publish\x86
+
+copy /Y "PackagingMallShipper\bin\Release\net462\PackagingMallShipper.exe" "publish\" >nul
+copy /Y "PackagingMallShipper\bin\Release\net462\PackagingMallShipper.exe.config" "publish\" >nul
+copy /Y "PackagingMallShipper\bin\Release\net462\x64\SQLite.Interop.dll" "publish\x64\" >nul
+copy /Y "PackagingMallShipper\bin\Release\net462\x86\SQLite.Interop.dll" "publish\x86\" >nul
+
 if not exist "publish\PackagingMallShipper.exe" (
     echo [Error] publish\PackagingMallShipper.exe not found
     echo.
-    echo Please build Release version first:
-    echo   dotnet build -c Release
-    echo.
     pause
     exit /b 1
 )
+echo [Info] Files copied to publish folder
+echo.
 
-echo [Info] Compiling installer...
+echo [Step 3] Compiling installer...
 echo.
 
 "%ISCC%" setup.iss