- Add cli_options_t structure for extensible command line options
- Implement port override in create_default_config_event()
- Update main() with robust CLI parsing and validation
- Add comprehensive help text documenting first-time only behavior
- Ensure CLI options only affect initial configuration event creation
- Maintain event-based configuration architecture for ongoing operation
- Include comprehensive error handling and input validation
- Add documentation in CLI_PORT_OVERRIDE_IMPLEMENTATION.md
Tested: First-time startup uses CLI port, subsequent startups use database config
