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Replace ZMQ-based service start/stop commands with SSH execution in tmux popups. This provides better user feedback with real-time systemctl output while eliminating blocking operations from the main message processing loop. Changes: - Service start/stop now use SSH with progress display - Added backup functionality with 'B' key - Preserved transitional icons (↑/↓) for immediate visual feedback - Removed all ZMQ service control commands and handlers - Updated configuration to include backup_alias setting - All operations (rebuild, backup, services) now use consistent SSH interface This ensures stable heartbeat processing while providing superior user experience with live command output and service status feedback.