Add .gitignore to exclude system and config files

Excludes bash history, SSH keys, cache directories, Claude Code files, Python artifacts, and application data files to keep the repository clean.

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

.gitignore

@@ -0,0 +1,45 @@
+# System files
+.bash_history
+.bash_logout
+.bashrc
+.profile
+.viminfo
+.sudo_as_admin_successful
+
+# SSH keys
+.ssh/
+
+# Cache and config directories
+.cache/
+.config/
+.local/
+
+# Claude Code files
+.claude/
+.claude.json
+.claude.json.backup*
+
+# Python
+__pycache__/
+*.pyc
+*.pyo
+*.pyd
+.Python
+*.so
+*.egg
+*.egg-info/
+dist/
+build/
+venv/
+env/
+
+# Application data
+photos/
+*.json.backup
+auth.json
+settings.json
+receipts.json
+
+# OS files
+.DS_Store
+Thumbs.db