feat: Add simplified build script for creating executables

Added build.py to simplify the process of building standalone executables
with PyInstaller. Also added .gitignore to exclude build artifacts.

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

.gitignore

@@ -0,0 +1,37 @@
+# Python
+__pycache__/
+*.py[cod]
+*$py.class
+*.so
+.Python
+*.egg-info/
+dist/
+build/
+*.egg
+.pytest_cache/
+
+# PyInstaller
+*.spec
+
+# Virtual Environment
+venv/
+env/
+ENV/
+
+# IDE
+.vscode/
+.idea/
+*.swp
+*.swo
+*~
+
+# OS
+.DS_Store
+Thumbs.db
+
+# Credentials
+credentials.json
+*.log
+
+# Claude
+.claude/settings.local.json