adding web flasher tool

flash_tool/build_from_spec.bat

@@ -1,11 +1,24 @@
 @echo off
+echo === ESP32 Flasher - Windows Build Script ===
+echo.
+
 echo Installing dependencies...
 pip install pyinstaller esptool pyserial
 
 echo.
-echo Building executable from spec file...
-pyinstaller ESP32_Flasher.spec
+echo Building Windows executable...
+pyinstaller ESP32_Flasher_Windows.spec
 
 echo.
-echo Build complete! Find ESP32_Flasher.exe in the dist folder.
+if exist "dist\ESP32_Flasher.exe" (
+    echo Build complete!
+    echo.
+    echo Executable created at: dist\ESP32_Flasher.exe
+    echo.
+    echo You can now distribute ESP32_Flasher.exe to users.
+) else (
+    echo Build failed - executable not found in dist folder
+    exit /b 1
+)
+
 pause