gitignore: exclude .bak, patch scripts, and temp files

.gitignore

@@ -57,3 +57,16 @@ android/app/build/
 
 # Node (future)
 node_modules/
+
+# backups
+*.bak
+*.bak.*
+*.broken.*
+
+# temp scripts
+patch*.sh
+
+# python cache
+__pycache__/
+*.pyc
+