修复采集服务状态不显示：serviceId与心跳查询不匹配，API返回字段与前端不匹配

src/CncCollector/Config/CollectorConfig.cs

@@ -39,7 +39,7 @@ namespace CncCollector.Config
 
         /// <summary>服务ID标识</summary>
         [JsonProperty("serviceId")]
-        public string ServiceId { get; set; } = "CncCollector";
+        public string ServiceId { get; set; } = "collector-service";
 
         // ===== 以下为从DB加载的运行时配置 =====
 

src/CncService/Impl/DashboardService.cs

@@ -75,7 +75,12 @@ namespace CncService.Impl
             var latest = _collectorHeartbeatRepository.GetLatest("collector-service");
             bool isRunning = latest != null && latest.LastCollectTime.HasValue &&
                              (DateTime.Now - latest.LastCollectTime.Value).TotalMinutes < 5;
-            return new { IsRunning = isRunning, LastCollectTime = latest?.LastCollectTime };
+            long uptimeSeconds = 0;
+            if (isRunning && latest != null)
+            {
+                uptimeSeconds = latest.UptimeSeconds ?? 0;
+            }
+            return new { status = isRunning ? "running" : "stopped", uptimeSeconds, lastCollectTime = latest?.LastCollectTime };
         }
     }
 }