feat(core): add SettingsSystem route

frontend/src/routes/index.tsx

@@ -19,6 +19,7 @@ import { SettingsProfilePage } from '@/pages/SettingsProfile';
 import { SettingsRolesPage } from '@/pages/SettingsRoles';
 import { SettingsUsersPage } from '@/pages/SettingsUsers';
 import { SettingsPluginsPage } from '@/pages/SettingsPlugins';
+import { SettingsSystemPage } from '@/pages/SettingsSystem';
 import { CalendarPage } from '@/pages/Calendar';
 import { CalendarKanbanPage } from '@/pages/CalendarKanban';
 import { DmsPage } from '@/pages/Dms';
@@ -72,6 +73,7 @@ const router = createBrowserRouter([
           { path: 'roles', element: <SettingsRolesPage /> },
           { path: 'users', element: <SettingsUsersPage /> },
           { path: 'plugins', element: <SettingsPluginsPage /> },
+          { path: 'system', element: <SettingsSystemPage /> },
         ],
       },
     ],