refactor: Systemdaten über eigenen Redux Thunk und Service laden

- Systeminformationen (IP, Subnetz, Gateway, NTP, etc.) werden nun über fetchSystemSettingsThunk geladen
- loadWindowVariables.ts von systemSettings-Logik bereinigt
- Aufruf erfolgt lokal in NetworkInfo.tsx statt global in _app.tsx
- Verbesserte Struktur, reduzierte Netzwerklast, klarere Trennung der Zuständigkeiten

services/fetchSystemSettings.ts

@@ -0,0 +1,17 @@
+// /services/fetchSystemSettings.ts
+export const fetchSystemSettings = async () => {
+  const win = window as any;
+  return {
+    deviceName: win.win_deviceName || "",
+    mac1: win.win_mac1 || "",
+    ip: win.win_ip || "",
+    subnet: win.win_subnet || "",
+    gateway: win.win_gateway || "",
+    cplInternalTimestamp: win.win_cplInternalTimestamp || "",
+    ntp1: win.win_ntp1 || "",
+    ntp2: win.win_ntp2 || "",
+    ntp3: win.win_ntp3 || "",
+    ntpTimezone: win.win_ntpTimezone || "",
+    ntpActive: win.win_ntpActive || false,
+  };
+};