fix: 告警CSV视频源用摄像头名称而非通道名

internal/web/ui.go

@@ -2726,12 +2726,26 @@ func (u *UI) apiAlarmExport(w http.ResponseWriter, r *http.Request) {
     for _, a := range records {
         devName := a.DeviceID
         devIP := ""
+        sourceName := a.Channel
         if dev, ok := deviceMap[a.DeviceID]; ok {
             devName = dev.DisplayName()
             devIP = dev.IP
         }
+        // Resolve channel to video source name
+        if u.preview != nil {
+            if assignment, err := u.preview.GetDeviceAssignment(a.DeviceID); err == nil && assignment != nil {
+                for _, ref := range assignment.RecognitionUnits {
+                    if unit, err := u.preview.GetRecognitionUnit(ref); err == nil && unit != nil {
+                        if unit.Name == a.Channel && unit.VideoSourceRef != "" {
+                            sourceName = unit.VideoSourceRef
+                            break
+                        }
+                    }
+                }
+            }
+        }
         fmt.Fprintf(w, "%s,%s,%s,%s,%s,%s,%s\n",
-            escapeCSV(devName), escapeCSV(devIP), escapeCSV(a.Channel),
+            escapeCSV(devName), escapeCSV(devIP), escapeCSV(sourceName),
             escapeCSV(alarmRuleLabel(a.RuleName)), escapeCSV(a.ObjectLabel),
             escapeCSV(alarmStatusLabel(a.Status)), escapeCSV(a.Timestamp))
     }