fix: syntax errors in all backends, wrong import path, entry point

- fix f-string escape bug in all 5 backends (user password handling)
- fix void.py import: from ..dinit (not .dinit — dinit.py is at package root)
- fix pyproject.toml entry point: cli:cli not cli:main
- add .gitignore for __pycache__

pyproject.toml

@@ -10,7 +10,7 @@ requires-python = ">=3.10"
 dependencies = ["pyyaml>=6", "click>=8"]
 
 [project.scripts]
-euri-mklive = "euri_mklive.cli:main"
+euri-mklive = "euri_mklive.cli:cli"
 
 [tool.setuptools.packages.find]
 include = ["euri_mklive*"]