feat(UptimeMonitor): add uptime monitor scheduler settings and endpoints for improved monitoring functionality

frontend/src/SettingsPage.jsx

@@ -89,6 +89,8 @@ export default function SettingsPage() {
   const [uptimeMonitorIntervalSeconds, setUptimeMonitorIntervalSeconds] = useState('120');
   const [uptimeMonitorCheckType, setUptimeMonitorCheckType] = useState('http');
   const [uptimeMonitorCacheSeconds, setUptimeMonitorCacheSeconds] = useState('120');
+  const [uptimeMonitorSchedulerEnabled, setUptimeMonitorSchedulerEnabled] = useState(true);
+  const [uptimeMonitorSchedulerIntervalMinutes, setUptimeMonitorSchedulerIntervalMinutes] = useState('2');
   const [serversList, setServersList] = useState([]);
   const [sidebarSearch, setSidebarSearch] = useState('');
   const [activeSection, setActiveSection] = useState(() => {
@@ -272,6 +274,12 @@ export default function SettingsPage() {
         setUptimeMonitorCacheSeconds(
           data?.uptimeMonitorCacheSeconds != null ? String(data.uptimeMonitorCacheSeconds) : '120'
         );
+        setUptimeMonitorSchedulerEnabled(data?.uptimeMonitorSchedulerEnabled !== false);
+        setUptimeMonitorSchedulerIntervalMinutes(
+          data?.uptimeMonitorSchedulerIntervalMinutes != null
+            ? String(data.uptimeMonitorSchedulerIntervalMinutes)
+            : '2'
+        );
         const raw = data?.trafficInterfaces;
         setTrafficInterfacesSelected(
           Array.isArray(raw)
@@ -391,6 +399,11 @@ export default function SettingsPage() {
           0,
           parseInt(uptimeMonitorCacheSeconds, 10) || 120
         ),
+        uptimeMonitorSchedulerEnabled: Boolean(uptimeMonitorSchedulerEnabled),
+        uptimeMonitorSchedulerIntervalMinutes: Math.max(
+          1,
+          Math.min(1440, parseInt(uptimeMonitorSchedulerIntervalMinutes, 10) || 2)
+        ),
         trafficInterfaces: Array.isArray(trafficInterfacesSelected)
           ? trafficInterfacesSelected.map((p) => ({
               serverKey: p.serverKey,
@@ -825,6 +838,33 @@ export default function SettingsPage() {
                     />
                   </div>
                 </div>
+                <div className="mt-3 mb-2">
+                  <div className="form-check form-switch mb-2">
+                    <input
+                      className="form-check-input"
+                      type="checkbox"
+                      id="uptimeMonitorSchedulerEnabled"
+                      checked={uptimeMonitorSchedulerEnabled}
+                      onChange={(e) => setUptimeMonitorSchedulerEnabled(e.target.checked)}
+                      disabled={saving}
+                    />
+                    <label className="form-check-label" htmlFor="uptimeMonitorSchedulerEnabled">
+                      Планировщик: обновлять кеш проверок по расписанию (после перезапуска контейнера кеш обновится автоматически)
+                    </label>
+                  </div>
+                  <FormField
+                    label="Интервал планировщика (мин)"
+                    name="uptimeMonitorSchedulerIntervalMinutes"
+                    type="number"
+                    value={uptimeMonitorSchedulerIntervalMinutes}
+                    onChange={setUptimeMonitorSchedulerIntervalMinutes}
+                    placeholder="2"
+                    helpText="Как часто планировщик проверяет все jumphost/home (1–1440 мин). По умолчанию 2 мин."
+                    disabled={saving}
+                    min={1}
+                    max={1440}
+                  />
+                </div>
               </>
               )}
 

frontend/src/UptimeMonitorPage.jsx

@@ -187,7 +187,14 @@ export default function UptimeMonitorPage() {
     setChecking(false);
   }, [jumphosts]);
 
-  // Автопроверка по интервалу в фоне (при открытии страницы данные берём из кеша, без немедленного запуска проверки)
+  // Первый запуск проверки через несколько секунд после загрузки (после перезапуска контейнера кеш может быть пустым или устаревшим)
+  useEffect(() => {
+    if (jumphosts.length === 0) return;
+    const t = setTimeout(runChecks, 4000);
+    return () => clearTimeout(t);
+  }, [jumphosts.length, runChecks]);
+
+  // Автопроверка по интервалу в фоне
   useEffect(() => {
     if (jumphosts.length === 0) return;
     intervalRef.current = setInterval(runChecks, checkIntervalMs);