Add Docker support: Dockerfile, docker-compose.yml, and production configuration

- Add Dockerfile with multi-stage build for Flask app containerization
- Include .dockerignore to optimize build context
- Add docker-compose.yml for easy deployment with health checks
- Update run.py to handle production mode with allow_unsafe_werkzeug
- Add DOCKER.md with comprehensive deployment instructions
- Configure health check endpoint at /health
- Run as non-root user for security
- Support for environment variables and proper port mapping

.dockerignore

@@ -0,0 +1,59 @@
+# Git
+.git
+.gitignore
+
+# Python
+__pycache__
+*.pyc
+*.pyo
+*.pyd
+.Python
+env
+pip-log.txt
+pip-delete-this-directory.txt
+.tox
+.coverage
+.coverage.*
+.cache
+nosetests.xml
+coverage.xml
+*.cover
+*.log
+.git
+.mypy_cache
+.pytest_cache
+.hypothesis
+
+# Virtual environments
+.venv
+venv/
+ENV/
+env/
+.env
+
+# IDE
+.vscode/
+.idea/
+*.swp
+*.swo
+*~
+
+# OS
+.DS_Store
+.DS_Store?
+._*
+.Spotlight-V100
+.Trashes
+ehthumbs.db
+Thumbs.db
+
+# Docker
+Dockerfile
+.dockerignore
+
+# Documentation
+README.md
+*.md
+
+# Qoder IDE
+.qoder/