build: Nuitka改为standalone模式并更新应用图标

onefile自解压易被杀软误报，改为standalone目录分发；
更新x.png应用图标。

build_win.cmd

@@ -3,12 +3,12 @@ chcp 65001 >nul
 setlocal
 
 set "PY=.venv\Scripts\python.exe"
-set "DIST=build\onefile"
+set "DIST=build\a1packer"
 
 if not exist "%DIST%" mkdir "%DIST%"
 
 "%PY%" -m nuitka ^
-  --mode=onefile ^
+  --mode=standalone ^
   --msvc=latest ^
   --enable-plugin=pyside6 ^
   --include-qt-plugins=platforms,imageformats,styles,iconengines ^
@@ -23,15 +23,17 @@ if errorlevel 1 exit /b %ERRORLEVEL%
 echo.
 echo GUI build done.
 
-robocopy "swap_gcode" "%DIST%\swap_gcode" /E
+set "OUTPUT=%DIST%\a1packer.dist"
+robocopy "swap_gcode" "%OUTPUT%\swap_gcode" /E
 if %ERRORLEVEL% GEQ 8 exit /b %ERRORLEVEL%
 
-copy /Y "gcode_patches.ini" "%DIST%\gcode_patches.ini" >nul
+copy /Y "gcode_patches.ini" "%OUTPUT%\gcode_patches.ini" >nul
 if errorlevel 1 exit /b %ERRORLEVEL%
 
-copy /Y "x.png" "%DIST%\x.png" >nul
+copy /Y "x.png" "%OUTPUT%\x.png" >nul
 if errorlevel 1 exit /b %ERRORLEVEL%
 
 echo.
-echo Build done: %DIST%
+echo Build done: %OUTPUT%
+echo The entire "%OUTPUT%" folder is the portable distribution.
 exit /b 0