Fix: Update .gitignore to recursively ignore all __pycache__ directories

- Change __pycache__/ to **/__pycache__/ for recursive pattern matching
- This ensures all subdirectory __pycache__ folders are properly ignored
- Prevents compiled Python cache files from being tracked in future

Author: liyang-bsy

.gitignore

@@ -1,5 +1,5 @@
 # Byte-compiled / optimized / DLL files
-__pycache__/
+**/__pycache__/
 *.py[cod]
 *$py.class