fix: rebuild build_windows.bat without Chinese / dangerous cmd patterns

- Remove all non-ASCII text (cmd default GBK mangles UTF-8)
- Replace 'if errorlevel 1 (' multi-line blocks with 'goto :label'
- Replace 'echo(' with 'echo.'
- Use 'for %%I' to get file size (avoid UTF-8 console findstr issues)
- All error paths now end with explicit exit /b 1

Fixes #1: '涓嬭浇鍦板潃' (mojibake) and '('") parse errors.

build_windows.bat

@@ -1,74 +1,115 @@
 @echo off
 REM ============================================
-REM SSHClient Windows 打包脚本
-REM 双击运行即可在当前目录生成 dist\SSHClient.exe
+REM SSHClient Windows build script
+REM Double-click to produce dist\SSHClient.exe
 REM ============================================
 
-setlocal enabledelayedexpansion
-chcp 65001 >nul
+REM Force UTF-8 console so non-ASCII paths work
+chcp 65001 >nul 2>&1
+
+setlocal
 
 echo.
 echo ============================================
-echo   SSHClient Windows 打包脚本
+echo   SSHClient Windows Build Script
 echo ============================================
 echo.
 
-REM 1. 检查 Python
+REM 1. Check Python
 python --version >nul 2>&1
-if errorlevel 1 (
-    echo [X] 未检测到 Python，请先安装 Python 3.10+
-    echo     下载地址: https://www.python.org/downloads/windows/
-    pause
-    exit /b 1
-)
-echo [OK] Python: 
+if errorlevel 1 goto :no_python
+
+echo [OK] Python found:
 python --version
+echo.
 
-REM 2. 创建 venv（避免污染全局）
-if not exist "venv\" (
-    echo.
-    echo [1/4] 创建虚拟环境 venv\
-    python -m venv venv
-    if errorlevel 1 (
-        echo [X] venv 创建失败
-        pause
-        exit /b 1
-    )
-)
+REM 2. Create venv if missing
+if not exist "venv\Scripts\python.exe" goto :create_venv
+goto :venv_ready
+
+:create_venv
+echo [1/4] Creating virtual environment venv\ ...
+python -m venv venv
+if errorlevel 1 goto :venv_fail
+
+:venv_ready
 call venv\Scripts\activate.bat
-
-REM 3. 安装依赖
+if errorlevel 1 goto :activate_fail
+echo [OK] venv activated
 echo.
-echo [2/4] 安装依赖（首次约 1-2 分钟）
+
+REM 3. Install dependencies
+echo [2/4] Installing dependencies (first run takes 1-2 minutes)...
 python -m pip install --upgrade pip --quiet
+if errorlevel 1 goto :pip_fail
 pip install -r requirements.txt --quiet
-if errorlevel 1 (
-    echo [X] 依赖安装失败
-    pause
-    exit /b 1
-)
-echo [OK] 依赖已就绪
-
-REM 4. 打包
+if errorlevel 1 goto :pip_fail
+echo [OK] Dependencies ready
 echo.
-echo [3/4] 开始打包 PyInstaller...
+
+REM 4. Build
+echo [3/4] Running PyInstaller...
 pyinstaller build.spec --clean --noconfirm
-if errorlevel 1 (
-    echo [X] 打包失败
-    pause
-    exit /b 1
-)
+if errorlevel 1 goto :build_fail
 
-REM 5. 完成
+REM 5. Done
 echo.
-echo [4/4] 打包完成！
+echo [4/4] Build complete.
 echo.
 echo ============================================
-echo   产物: dist\SSHClient.exe
-echo   大小: 
-dir dist\SSHClient.exe | findstr "SSHClient.exe"
+echo   Output: dist\SSHClient.exe
+if exist "dist\SSHClient.exe" (
+    echo   Size:
+    for %%I in ("dist\SSHClient.exe") do echo     %%~zI bytes
+) else (
+    echo   WARNING: SSHClient.exe not found in dist\
+)
 echo ============================================
 echo.
-echo 把 dist\SSHClient.exe 拷到任何 Windows 电脑双击即可运行。
+echo Copy dist\SSHClient.exe to any Windows PC and double-click to run.
+echo.
+goto :end
+
+:no_python
+echo.
+echo [ERROR] Python not found in PATH.
+echo         Please install Python 3.10+ from:
+echo         https://www.python.org/downloads/windows/
+echo         IMPORTANT: Check "Add Python to PATH" during install.
 echo.
 pause
+exit /b 1
+
+:venv_fail
+echo.
+echo [ERROR] Failed to create venv.
+echo.
+pause
+exit /b 1
+
+:activate_fail
+echo.
+echo [ERROR] Failed to activate venv.
+echo.
+pause
+exit /b 1
+
+:pip_fail
+echo.
+echo [ERROR] Failed to install dependencies.
+echo         Check your network connection and try again.
+echo.
+pause
+exit /b 1
+
+:build_fail
+echo.
+echo [ERROR] PyInstaller build failed.
+echo         Scroll up to see the error details.
+echo.
+pause
+exit /b 1
+
+:end
+pause
+endlocal