✅ test(user): 优化用户服务测试文件

- 移除未使用的Role实体导入
- 为importOriginal添加类型断言，解决类型检查问题

src/server/modules/users/__tests__/user.service.test.ts

@@ -1,13 +1,12 @@
 import { UserService } from '../user.service';
-import { DataSource, Repository } from 'typeorm';
+import { DataSource } from 'typeorm';
 import { UserEntity as User } from '../user.entity';
-import { Role } from '../role.entity';
 import * as bcrypt from 'bcrypt';
 import { describe, it, expect, beforeEach, afterEach, vi } from 'vitest';
 
 // Mock TypeORM 数据源和仓库
 vi.mock('typeorm', async (importOriginal) => {
-  const actual = await importOriginal()
+  const actual = await importOriginal() as any
   return {
     ...actual,
     DataSource: vi.fn().mockImplementation(() => ({