fix(docker): добавить переменную окружения для внутреннего URL бэкенда

app/(main)/data-collection/page.tsx

@@ -751,8 +751,8 @@ function RunRowDetail({ r }: { r: SchedulerRunRowDto }) {
 }
 
 export default function DataCollectionPage() {
-  const { mode, backendUrl } = useDataSource()
-  const isLive = mode === "live"
+  const { mode, backendUrl, prefsHydrated } = useDataSource()
+  const isLive = prefsHydrated && mode === "live"
   const apiFetch = useMemo(() => makeApiFetch(backendUrl), [backendUrl])
 
   const [trafficCollector, setTrafficCollector] = useState<CollectorSettingsDto | null>(null)
@@ -1003,7 +1003,18 @@ export default function DataCollectionPage() {
 
       <div className="flex-1 overflow-y-auto p-6">
         <div className="flex flex-col gap-5 max-w-[1100px] mx-auto w-full">
-          {!isLive && (
+          {!prefsHydrated && (
+            <Card>
+              <CardHeader>
+                <CardTitle className="text-base">Загрузка настроек подключения</CardTitle>
+                <CardDescription className="text-xs">
+                  Читаем режим данных и адрес API из локальных настроек.
+                </CardDescription>
+              </CardHeader>
+            </Card>
+          )}
+
+          {prefsHydrated && !isLive && (
             <Card>
               <CardHeader>
                 <CardTitle className="text-base">Нужен live-режим</CardTitle>