add network guard

projects/nshmp-apps/src/app/internal/shared/guards/network.guard.ts

+import {inject} from '@angular/core';
+import {CanActivateFn} from '@angular/router';
+
+import {AuthService} from '../services/auth.service';
+
+/**
+ * Network auth route guard.
+ */
+export const networkGuard: CanActivateFn = () => {
+  const authService = inject(AuthService);
+  return authService.isAuthorized();
+};