fix(frontend): break service layer circular imports for build

Point service implementations at @/lib/services/core for BaseService
instead of the barrel index, fixing static export prerender failure on
ConfigService initialization.

frontend/lib/services/admin/admin.service.ts

@@ -1,4 +1,4 @@
-import {BaseService} from '@/lib/services';
+import {BaseService} from '@/lib/services/core';
 import type {
   AdminUser,
   AppUpdateStatus,

frontend/lib/services/auth/auth.service.ts

@@ -1,5 +1,5 @@
 import type {InternalAxiosRequestConfig} from 'axios';
-import {BaseService} from '@/lib/services';
+import {BaseService} from '@/lib/services/core';
 import type {
   AuthSource,
   ChangePasswordRequest,

frontend/lib/services/config/config.service.ts

@@ -1,4 +1,4 @@
-import {BaseService} from '@/lib/services';
+import {BaseService} from '@/lib/services/core';
 import type {PublicConfigResponse} from './types';
 
 /**

frontend/lib/services/db-manage/db-manage.service.ts

@@ -1,4 +1,4 @@
-import {BaseService} from '@/lib/services';
+import {BaseService} from '@/lib/services/core';
 import type {DBOverview, ExecuteSQLResponse, TableDataResponse} from './types';
 
 /**

frontend/lib/services/push/push.service.ts

@@ -1,7 +1,7 @@
 // Copyright 2026 Arctel.net
 // SPDX-License-Identifier: Apache-2.0
 
-import {BaseService} from '@/lib/services';
+import {BaseService} from '@/lib/services/core';
 import type {
   ChannelDefinition,
   CreateChannelRequest,