refactor(frontend): colocate admin components and split service layer

Move route-specific admin components from components/common/admin into
app/(main)/admin/<feature>/components/. Split AdminService god object into
domain services, fix UploadService to use BaseService, add AdminUploadService,
consolidate DB export into DbManageService, and migrate consumers to the
unified services entry.

frontend/lib/services/admin/index.ts

@@ -1,25 +1,12 @@
-/**
- * 管理员服务模块
- *
- * @description
- * 提供系统配置、用户与任务管理功能，包括：
- * - 系统配置管理（创建、查询、更新、删除）
- * - 异步任务配置及下发
- * - 用户账号状态管理
- *
- * @remarks
- * 所有接口都需要管理员权限
- *
- * @example
- * ```typescript
- * import { AdminService } from '@/lib/services';
- *
- * // 获取系统配置列表
- * const configs = await AdminService.listSystemConfigs();
- * ```
- */
+export { AdminSystemConfigService } from './system-config.service';
+export { AdminAuthSourceService } from './auth-source.service';
+export { AdminTaskService } from './task.service';
+export { AdminUserService } from './user.service';
+export { AdminStatusService } from './status.service';
+export { AdminLogService } from './log.service';
+export { AdminTemplateService } from './template.service';
+export { AdminCacheService } from './cache.service';
 
-export { AdminService } from './admin.service';
 export type {
   SystemConfig,
   CreateSystemConfigRequest,
@@ -41,11 +28,16 @@ export type {
   ListUsersResponse,
   UpdateUserStatusRequest,
   SystemStatus,
-  DatabaseInfo,
   AppUpdateStatus,
   Schedule,
   CreateScheduleRequest,
   UpdateScheduleRequest,
   CacheStatus,
   CacheConfig,
-} from './types';
+  Template,
+  CreateTemplateRequest,
+  UpdateTemplateRequest,
+  StorageDriver,
+  StorageConfig,
+  ObjectStorageConfig,
+} from './types';