feat(deploy): merge Phase 5a deployment configuration

Complete containerized deployment system with Docker/Podman support.

Key features:
- Multi-stage Dockerfile with Python 3.11-slim base
- Docker Compose configurations for production and development
- Nginx reverse proxy with security headers and rate limiting
- Systemd service units for Docker, Podman, and docker-compose
- Backup/restore scripts with integrity verification
- Podman compatibility (ADR-009)

All tests pass including Podman verification testing.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

.dockerignore

@@ -0,0 +1,107 @@
+# Gondulf - Docker Build Context Exclusions
+# Reduces build context size and build time
+
+# Git
+.git
+.gitignore
+.gitattributes
+
+# Python
+__pycache__
+*.py[cod]
+*$py.class
+*.so
+.Python
+*.egg
+*.egg-info/
+dist/
+build/
+*.whl
+.venv/
+venv/
+env/
+ENV/
+
+# Testing and Coverage
+.pytest_cache/
+.coverage
+htmlcov/
+.tox/
+.hypothesis/
+*.cover
+*.log
+
+# Documentation
+docs/
+*.md
+!README.md
+
+# IDE and Editor files
+.vscode/
+.idea/
+*.swp
+*.swo
+*.swn
+.DS_Store
+*.sublime-*
+.project
+.pydevproject
+
+# Environment and Configuration
+.env
+.env.*
+!.env.example
+
+# Data and Runtime
+data/
+backups/
+*.db
+*.db-journal
+*.db-wal
+*.db-shm
+
+# Deployment files (not needed in image except entrypoint)
+docker-compose*.yml
+Dockerfile*
+.dockerignore
+deployment/nginx/
+deployment/systemd/
+deployment/scripts/
+deployment/README.md
+# Note: deployment/docker/entrypoint.sh is needed in the image
+
+# CI/CD
+.github/
+.gitlab-ci.yml
+.travis.yml
+Jenkinsfile
+
+# OS files
+.DS_Store
+Thumbs.db
+desktop.ini
+
+# Temporary files
+*.tmp
+*.temp
+*.bak
+*.backup
+*~
+
+# Logs
+logs/
+*.log
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+
+# Lock files (we keep uv.lock, exclude others)
+package-lock.json
+yarn.lock
+Pipfile.lock
+
+# Misc
+.cache/
+*.pid
+*.seed
+*.pid.lock