ci: add release workflow for Windows, macOS, and Linux binaries

- Build standalone executables with PyInstaller
- Auto-create GitHub release on version tag push
- Release includes binaries for all platforms

.gitignore

@@ -27,10 +27,10 @@ share/python-wheels/
 MANIFEST
 
 # PyInstaller
-#  Usually these files are written by a python script from a template
-#  before PyInstaller builds the exe, so as to inject date/other infos into it.
 *.manifest
 *.spec
+dist/
+build/
 
 # Installer logs
 pip-log.txt