Show archive count range to detect inconsistencies

- Display single number if all services have same count
- Display min-max range if counts differ (indicates problem)

agent/src/collectors/backup.rs

@@ -142,12 +142,17 @@ impl BackupCollector {
                     // Build service list for this disk
                     let services: Vec<String> = backup_status.services.keys().cloned().collect();
 
-                    // Get archive count per service (use minimum to show if any service has fewer backups)
-                    let total_archives: i64 = backup_status.services.values()
+                    // 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()),
@@ -161,7 +166,8 @@ impl BackupCollector {
                         disk_total_gb: total_gb,
                         usage_status,
                         services,
-                        total_archives,
+                        archives_min,
+                        archives_max,
                     };
 
                     disks.push(disk_data);