feat: add comprehensive .gitignore for Python project

Add .gitignore file with rules for Python, IDE, test files, build artifacts, virtual environments, OS generated files, editor backups, test coverage, Python tooling, Jupyter, and RSA keypairs to improve repository cleanliness and prevent unwanted files from being committed.

.gitignore

@@ -0,0 +1,105 @@
+# Python
+*.py[cod]
+__pycache__/
+.Python
+python-profile.*
+build/
+develop-eggs/
+dist/
+downloads/
+eggs/
+.eggs/
+lib/
+lib64/
+parts/
+sdist/
+var/
+wheels/
+*.egg-info/
+.installed.cfg
+*.egg
+MANIFEST
+
+# Environment
+.env
+.venv
+env/
+venv/
+ENV/
+env.bak/
+venv.bak/
+
+# IDE
+.idea/
+.vscode/
+*.swp
+*.swo
+*.bak
+*.tmp
+*.log
+
+# Test files
+*.test
+*.test.py
+__pycache__/
+.py[co]
+
+# Build artifacts
+build/
+dist/
+*.egg-info/
+*.egg
+
+# Virtual environments
+venv/
+.env
+.env.bak
+
+# OS generated files
+.DS_Store
+.DS_Store?
+._*
+.Spotlight-V100
+.Trashes
+ehthumbs.db
+Thumbs.db
+
+# Editor backup files
+*.swp
+*.swo
+
+# Test coverage
+.htmlcov/
+.coverage
+.coverage.*
+.coveragerc
+cover.xml
+
+# Python tooling
+.pytest_cache/
+.mypy_cache/
+.pylint.d/
+.flake8
+.tox/
+.hypothesis/
+.instances/
+
+# Jupyter
+.ipynb_checkpoints/
+.jupyter/
+.jupyterlite/
+
+# RSA Keypairs
+client_keys/
+*.pem
+*.key
+*.cer
+*.crt
+*.csr
+*.der
+*.pfx
+*.p12
+*.p7b
+*.p7c
+*.p7r
+*.p7s