Add comprehensive clustering support for distributed processing

- Implement cluster master/client architecture with token-based authentication
- Add cluster configuration options (host, port, token, client mode)
- Create cluster communication protocol for distributed workload management
- Implement load balancing with configurable process weights
- Add cluster management web interface for monitoring and control
- Support mixed local/remote worker deployment
- Enable/disable processes across cluster nodes
- Update queue manager for distributed job execution
- Add cluster documentation and configuration examples