fix(settings): проверять доступность текущего источника без гонок

shared/api/backend-health.ts

@@ -0,0 +1,9 @@
+import {resolveApiUrl} from "./http-client"
+export function confirmBackendHealth(raw:unknown):void {
+ if(typeof raw!=="object"||raw===null||(!("status" in raw&&raw.status==="ok")&&!("ok" in raw&&raw.ok===true)))throw new Error("Доступность backend не подтверждена")
+}
+export async function getBackendHealth(baseUrl:string,signal?:AbortSignal):Promise<void>{
+ const response=await fetch(resolveApiUrl(baseUrl,"/health"),{cache:"no-store",signal:signal?AbortSignal.any([signal,AbortSignal.timeout(3000)]):AbortSignal.timeout(3000)})
+ if(!response.ok)throw new Error("Backend недоступен")
+ confirmBackendHealth(await response.json())
+}