Migrate service control from ZMQ to SSH with real-time progress

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.

agent/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "cm-dashboard-agent"
-version = "0.1.73"
+version = "0.1.74"
 edition = "2021"
 
 [dependencies]

agent/src/agent.rs

@@ -4,7 +4,7 @@ use std::time::Duration;
 use tokio::time::interval;
 use tracing::{debug, error, info};
 
-use crate::communication::{AgentCommand, ServiceAction, ZmqHandler};
+use crate::communication::{AgentCommand, ZmqHandler};
 use crate::config::AgentConfig;
 use crate::metrics::MetricCollectionManager;
 use crate::notifications::NotificationManager;
@@ -315,79 +315,10 @@ impl Agent {
                 info!("Processing Ping command - agent is alive");
                 // Could send a response back via ZMQ if needed
             }
-            AgentCommand::ServiceControl { service_name, action } => {
-                info!("Processing ServiceControl command: {} {:?}", service_name, action);
-                if let Err(e) = self.handle_service_control(&service_name, &action).await {
-                    error!("Failed to execute service control: {}", e);
-                }
-            }
         }
         Ok(())
     }
 
-    /// Handle systemd service control commands
-    async fn handle_service_control(&mut self, service_name: &str, action: &ServiceAction) -> Result<()> {
-        let (action_str, is_user_action) = match action {
-            ServiceAction::Start => ("start", false),
-            ServiceAction::Stop => ("stop", false), 
-            ServiceAction::Status => ("status", false),
-            ServiceAction::UserStart => ("start", true),
-            ServiceAction::UserStop => ("stop", true),
-        };
-
-        info!("Executing systemctl {} {} (user action: {})", action_str, service_name, is_user_action);
-
-        // Handle user-stopped service tracking before systemctl execution (stop only)
-        match action {
-            ServiceAction::UserStop => {
-                info!("Marking service '{}' as user-stopped", service_name);
-                if let Err(e) = self.service_tracker.mark_user_stopped(service_name) {
-                    error!("Failed to mark service as user-stopped: {}", e);
-                } else {
-                    // Sync to global tracker
-                    UserStoppedServiceTracker::update_global(&self.service_tracker);
-                }
-            }
-            _ => {}
-        }
-
-        // Spawn the systemctl command asynchronously to avoid blocking the agent
-        let service_name_clone = service_name.to_string();
-        let action_str_clone = action_str.to_string();
-        
-        tokio::spawn(async move {
-            let result = tokio::process::Command::new("sudo")
-                .arg("systemctl")
-                .arg(&action_str_clone)
-                .arg(format!("{}.service", service_name_clone))
-                .output()
-                .await;
-
-            match result {
-                Ok(output) => {
-                    if output.status.success() {
-                        info!("Service {} {} completed successfully", service_name_clone, action_str_clone);
-                        if !output.stdout.is_empty() {
-                            debug!("stdout: {}", String::from_utf8_lossy(&output.stdout));
-                        }
-                    } else {
-                        let stderr = String::from_utf8_lossy(&output.stderr);
-                        error!("Service {} {} failed: {}", service_name_clone, action_str_clone, stderr);
-                    }
-                }
-                Err(e) => {
-                    error!("Failed to execute systemctl {} {}: {}", action_str_clone, service_name_clone, e);
-                }
-            }
-        });
-
-        info!("Service {} {} command initiated (non-blocking)", service_name, action_str);
-
-        // Note: Service status will be updated by the normal metric collection cycle
-        // once the systemctl operation completes
-
-        Ok(())
-    }
 
     /// Check metrics for user-stopped services that are now active and clear their flags
     fn clear_user_stopped_flags_for_active_services(&mut self, metrics: &[Metric]) {

agent/src/communication/mod.rs

@@ -98,19 +98,4 @@ pub enum AgentCommand {
     ToggleCollector { name: String, enabled: bool },
     /// Request status/health check
     Ping,
-    /// Control systemd service
-    ServiceControl {
-        service_name: String,
-        action: ServiceAction,
-    },
-}
-
-/// Service control actions
-#[derive(Debug, Clone, serde::Deserialize, serde::Serialize)]
-pub enum ServiceAction {
-    Start,
-    Stop,
-    Status,
-    UserStart,  // User-initiated start (clears user-stopped flag)
-    UserStop,   // User-initiated stop (marks as user-stopped)
 }