Chore/production readiness

[RonaldRonnie]

• Fix indentation errors in config.py logging setup
• Add rate limiting middleware with configurable limits
• Add request ID middleware for request tracking
• Improve CORS configuration with environment-based origins
• Add global exception handlers for better error handling
• Add input validation for PMID endpoints
• Add production configuration options (CORS, rate limiting, environment)
• Create production deployment guide with best practices
• Add production docker-compose.yml with resource limits
• Improve main.py to support multiple workers for production
• Add comprehensive error handling and logging

Security:

• Configurable CORS origins (not * in production)
• Rate limiting per IP
• Input validation for all endpoints
• Request ID tracking for debugging

Performance:

• Support for multiple uvicorn workers
• Resource limits in Docker
• Optimized logging configuration

Documentation:

• Complete production deployment guide
• Security best practices
• Performance optimization tips
• Troubleshooting guide"