Remove __pycache__ files and fix .gitignore

- Update .gitignore to properly ignore __pycache__ in all subdirectories
- Add *.pyc and *.pyo patterns
- Remove accidentally committed pycache files from tracking

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

.gitignore

@@ -6,7 +6,10 @@ drawing.png
 to_print.zpl
 tmp/*
 merged_image.png
-__pycache__/*
+__pycache__/
+**/__pycache__/
+*.pyc
+*.pyo
 freeze_frame.png
 image-temp.jpg