Add .gitignore files and clean up tracked files

.gitignore

@@ -0,0 +1,37 @@
+# Godot 4+ specific ignores
+.godot/
+*.tmp
+
+# Godot-specific ignores
+.import/
+export.cfg
+export_presets.cfg
+
+# Imported translations (automatically generated from CSV files)
+*.translation
+
+# Mono/C# specific ignores
+.mono/
+data_*/
+mono_crash.*.json
+
+# System/tool-specific ignores
+.directory
+*~
+*.uid
+
+# macOS
+.DS_Store
+.AppleDouble
+.LSOverride
+
+# Windows
+Thumbs.db
+ehthumbs.db
+Desktop.ini
+
+# VS Code
+.vscode/
+
+# JetBrains
+.idea/