build(portable): 把 OPENCLAW_VERSION 拷进 portable/ 让 U盘用户能读版本 + Start.bat 转义修复

setup.bat/setup.sh 打包时把版本文件 copy 进 portable/,U盘用户脱离 repo 根
也能读到版本号。Windows-Start.bat 修 cmd.exe 把未转义 ) 当块结束的坑(加 ^ 转义)。

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

portable/Windows-Start.bat

@@ -1,4 +1,4 @@
-@echo off
+@echo off
 chcp 65001 >nul 2>&1
 title U-Claw - Portable AI Agent
 
@@ -64,6 +64,7 @@ if not exist "%STATE_DIR%\openclaw.json" (
 )
 
 REM Check dependencies
+REM Note: avoid unescaped parens inside this block — cmd.exe treats ) as block-end.
 if not exist "%CORE_DIR%\node_modules" (
     echo   ========================================
     echo   [WARN] node_modules not found