fix: 时间格式去除T和时区，视频源回退通道名

internal/web/ui.go

@@ -2768,8 +2768,11 @@ func (u *UI) apiAlarmExport(w http.ResponseWriter, r *http.Request) {
                 }
             }
         }
+        if sourceName == "" {
+            sourceName = a.Channel
+        }
         fmt.Fprintf(w, "%s,%s,%s,%s,%s,%s,%s\n",
-            escapeCSV(a.Timestamp), escapeCSV(devName), escapeCSV(devIP), escapeCSV(sourceName),
+            escapeCSV(formatAlarmTime(a.Timestamp)), escapeCSV(devName), escapeCSV(devIP), escapeCSV(sourceName),
             escapeCSV(alarmRuleLabel(a.RuleName)), escapeCSV(a.ObjectLabel),
             escapeCSV(alarmStatusLabel(a.Status)))
     }
@@ -2814,6 +2817,16 @@ func alarmStatusLabel(v string) string {
     }
 }
 
+func formatAlarmTime(t string) string {
+    // 2026-07-22T13:03:20+08:00 → 2026-07-22 13:03:20
+    s := strings.TrimSpace(t)
+    s = strings.Replace(s, "T", " ", 1)
+    if idx := strings.Index(s, "+"); idx > 0 {
+        s = s[:idx]
+    }
+    return strings.TrimSpace(s)
+}
+
 func (u *UI) pageResources(w http.ResponseWriter, r *http.Request) {
     u.ensureDevicesLoaded()
     data := PageData{Title: "资源管理", Devices: u.registry.GetDevices()}

internal/web/ui/templates/alarms.html

@@ -62,7 +62,7 @@
             <a href="/devices/{{.DeviceID}}">{{index $.AlarmDeviceNames .DeviceID}}</a>
             <div class="muted small mono">{{index $.AlarmDeviceIPs .DeviceID}}</div>
           </td>
-          <td>{{index $.AlarmChannelSources .Channel}}</td>
+          <td>{{if index $.AlarmChannelSources .Channel}}{{index $.AlarmChannelSources .Channel}}{{else}}{{.Channel}}{{end}}</td>
           <td>
             <span class="pill warn">{{ruleLabel .RuleName}}</span>
           </td>