Restructure backup display to show per-repository metrics

Remove disk-based backup display and implement repository-centric view
with per-repo archive counts and sizes. Backup now uses NFS storage
instead of direct disk monitoring.

Changes:
- Remove BackupDiskData, add BackupRepositoryData structure
- Display format: "Repo <timestamp>" with per-repo details
- Show archive count and size (MB/GB) for each repository
- Agent aggregates repo data from backup status TOML files
- Dashboard renders repo list with individual status indicators

agent/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "cm-dashboard-agent"
-version = "0.1.266"
+version = "0.1.267"
 edition = "2021"
 
 [dependencies]

agent/src/collectors/backup.rs

@@ -1,7 +1,7 @@
 use async_trait::async_trait;
-use cm_dashboard_shared::{AgentData, BackupData, BackupDiskData, Status};
+use cm_dashboard_shared::{AgentData, BackupData, BackupRepositoryData, Status};
 use serde::{Deserialize, Serialize};
-use std::collections::{HashMap, HashSet};
+use std::collections::HashMap;
 use std::fs;
 use std::path::{Path, PathBuf};
 use tracing::{debug, warn};
@@ -83,17 +83,6 @@ impl BackupCollector {
         }
     }
 
-    /// Calculate usage status from disk usage percentage
-    fn calculate_usage_status(usage_percent: f32) -> Status {
-        if usage_percent < 80.0 {
-            Status::Ok
-        } else if usage_percent < 90.0 {
-            Status::Warning
-        } else {
-            Status::Critical
-        }
-    }
-
     /// Convert BackupStatusToml to BackupData and populate AgentData
     async fn populate_backup_data(&self, agent_data: &mut AgentData) -> Result<(), CollectorError> {
         let status_files = self.scan_status_files().await?;
@@ -101,76 +90,47 @@ impl BackupCollector {
         if status_files.is_empty() {
             debug!("No backup status files found");
             agent_data.backup = BackupData {
+                last_backup_time: None,
+                backup_status: Status::Unknown,
                 repositories: Vec::new(),
-                repository_status: Status::Unknown,
-                disks: Vec::new(),
             };
             return Ok(());
         }
 
-        let mut all_repositories = HashSet::new();
-        let mut disks = Vec::new();
+        // Aggregate repository data across all backup status files
+        let mut repo_map: HashMap<String, BackupRepositoryData> = HashMap::new();
         let mut worst_status = Status::Ok;
+        let mut latest_backup_time: Option<String> = None;
 
         for status_file in status_files {
             match self.read_status_file(&status_file).await {
                 Ok(backup_status) => {
-                    // Collect all service names
-                    for service_name in backup_status.services.keys() {
-                        all_repositories.insert(service_name.clone());
-                    }
-
                     // Calculate backup status
                     let backup_status_enum = Self::calculate_backup_status(&backup_status.status);
+                    worst_status = worst_status.max(backup_status_enum);
 
-                    // Calculate usage status from disk space
-                    let (usage_percent, used_gb, total_gb, usage_status) = if let Some(disk_space) = &backup_status.disk_space {
-                        let usage_pct = disk_space.usage_percent as f32;
-                        (
-                            usage_pct,
-                            disk_space.used_gb as f32,
-                            disk_space.total_gb as f32,
-                            Self::calculate_usage_status(usage_pct),
-                        )
-                    } else {
-                        (0.0, 0.0, 0.0, Status::Unknown)
-                    };
+                    // Track latest backup time
+                    if latest_backup_time.is_none() || Some(&backup_status.start_time) > latest_backup_time.as_ref() {
+                        latest_backup_time = Some(backup_status.start_time.clone());
+                    }
 
-                    // Update worst status
-                    worst_status = worst_status.max(backup_status_enum).max(usage_status);
+                    // Process each service in this backup
+                    for (service_name, service_status) in backup_status.services {
+                        // Convert bytes to GB
+                        let repo_size_gb = service_status.repo_size_bytes as f32 / 1_073_741_824.0;
 
-                    // Build service list for this disk
-                    let services: Vec<String> = backup_status.services.keys().cloned().collect();
+                        // Calculate service status
+                        let service_status_enum = Self::calculate_backup_status(&service_status.status);
+                        worst_status = worst_status.max(service_status_enum);
 
-                    // Get min and max archive counts to detect inconsistencies
-                    let archives_min: i64 = backup_status.services.values()
-                        .map(|service| service.archive_count)
-                        .min()
-                        .unwrap_or(0);
-
-                    let archives_max: i64 = backup_status.services.values()
-                        .map(|service| service.archive_count)
-                        .max()
-                        .unwrap_or(0);
-
-                    // Create disk data
-                    let disk_data = BackupDiskData {
-                        serial: backup_status.disk_serial_number.unwrap_or_else(|| "Unknown".to_string()),
-                        product_name: backup_status.disk_product_name,
-                        wear_percent: backup_status.disk_wear_percent,
-                        temperature_celsius: None, // Not available in current TOML
-                        last_backup_time: Some(backup_status.start_time),
-                        backup_status: backup_status_enum,
-                        disk_usage_percent: usage_percent,
-                        disk_used_gb: used_gb,
-                        disk_total_gb: total_gb,
-                        usage_status,
-                        services,
-                        archives_min,
-                        archives_max,
-                    };
-
-                    disks.push(disk_data);
+                        // Update or insert repository data
+                        repo_map.insert(service_name.clone(), BackupRepositoryData {
+                            name: service_name,
+                            archive_count: service_status.archive_count,
+                            repo_size_gb,
+                            status: service_status_enum,
+                        });
+                    }
                 }
                 Err(e) => {
                     warn!("Failed to read backup status file {:?}: {}", status_file, e);
@@ -178,12 +138,14 @@ impl BackupCollector {
             }
         }
 
-        let repositories: Vec<String> = all_repositories.into_iter().collect();
+        // Convert HashMap to sorted Vec
+        let mut repositories: Vec<BackupRepositoryData> = repo_map.into_values().collect();
+        repositories.sort_by(|a, b| a.name.cmp(&b.name));
 
         agent_data.backup = BackupData {
+            last_backup_time: latest_backup_time,
+            backup_status: worst_status,
             repositories,
-            repository_status: worst_status,
-            disks,
         };
 
         Ok(())