修复在线设备数量问题

src/DRS9.Dashboard.Server/Controllers/DevicesManagementController.cs

@@ -342,16 +342,13 @@ public class DashboardController : ControllerBase
 {
     private readonly DeviceManagementService _deviceManagementService;
     private readonly ApplicationService _applicationService;
-    private readonly ILogger<DashboardController> _logger;
 
     public DashboardController(
         DeviceManagementService deviceManagementService,
-        ApplicationService applicationService,
+        ApplicationService applicationService)
-        ILogger<DashboardController> logger)
     {
         _deviceManagementService = deviceManagementService;
         _applicationService = applicationService;
-        _logger = logger;
     }
 
     /// <summary>
@@ -365,24 +362,10 @@ public class DashboardController : ControllerBase
 
         // 在线设备：1分钟内有活动
         var onlineThreshold = DateTime.UtcNow.AddMinutes(-1);
-        var onlineCount = devices.Data.Count(d => d.LastSeenAt.HasValue && d.LastSeenAt >= onlineThreshold);
-
-        // 调试输出
-        _logger.LogInformation("UTC Now: {Now}", DateTime.UtcNow.ToString("yyyy-MM-dd HH:mm:ss"));
-        _logger.LogInformation("Online Threshold: {Threshold}", onlineThreshold.ToString("yyyy-MM-dd HH:mm:ss"));
-        foreach (var d in devices.Data)
-        {
-            _logger.LogInformation("Device {Id}: LastSeenAt={LastSeenAt}, IsOnline={IsOnline}",
-                d.Id,
-                d.LastSeenAt?.ToString("yyyy-MM-dd HH:mm:ss") ?? "null",
-                d.LastSeenAt.HasValue && d.LastSeenAt >= onlineThreshold);
-        }
-        _logger.LogInformation("Online Count: {Count}", onlineCount);
-
         var stats = new DashboardStatsDto
         {
             TotalDevices = devices.Data.Count,
-            OnlineDevices = onlineCount,
+            OnlineDevices = devices.Data.Count(d => d.LastSeenAt.HasValue && d.LastSeenAt >= onlineThreshold),
             TotalApplications = applications.Total
         };