- Added cluster_master_weight config option (default: 'auto')
- Implemented weight precedence: command line > config file > default 'auto'
- 'auto' mode enables automatic weight adjustment (100->0 on first client, 0->100 when all disconnect)
- Explicit numeric weights disable automatic adjustment
- Updated sample config file with cluster_master_weight setting
- Enhanced command line parsing to accept 'auto' or numeric values
- Improved startup messages to indicate weight source and behavior