refactor(api): implement abort signal handling in API requests across multiple components to improve cancellation of ongoing requests and prevent memory leaks

frontend/src/InterfaceSpeedTest.jsx

@@ -30,13 +30,16 @@ export default function InterfaceSpeedTest() {
   });
 
   useEffect(() => {
+    const controller = new AbortController();
+    const signal = controller.signal;
+
     const load = async () => {
       setLoading(true);
       try {
         const [serversRes, netRes, uiRes] = await Promise.all([
-          api.get('/servers'),
-          api.get('/network-config').catch(() => ({ data: null })),
-          api.get('/ui-settings').catch(() => ({ data: {} })),
+          api.get('/servers', { signal }),
+          api.get('/network-config', { signal }).catch(() => ({ data: null })),
+          api.get('/ui-settings', { signal }).catch(() => ({ data: {} })),
         ]);
 
         setServers(Array.isArray(serversRes?.data) ? serversRes.data : []);
@@ -69,6 +72,7 @@ export default function InterfaceSpeedTest() {
           cacheMinutes,
         });
       } catch (e) {
+        if (e?.name === 'CanceledError' || e?.name === 'AbortError' || e?.code === 'ERR_CANCELED') return;
         console.error('[InterfaceSpeedTest] load failed', e);
         notify.error('Не удалось загрузить данные для замера скорости');
       } finally {
@@ -76,6 +80,7 @@ export default function InterfaceSpeedTest() {
       }
     };
     load();
+    return () => controller.abort();
   }, [notify]);
 
   const gateways = useMemo(