GitLab

- Add user_agent field to API contract test expectation
- Add ListWithFiltersAndAccountCount stub to proxyRepoStub

- Fix gofmt formatting issue in user_service.go
- Remove unused sql field from userAttributeValueRepository
- Update ListWithFilters signature in test stubs to match interface
- Remove Wechat field from test user data

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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

覆盖管理员创建用户与注册流程的关键失败分支\n完善创建成功路径的断言

新增 AdminService 删除路径单元测试与规范场景更新\n同步调整 Google API Key 中间件测试桩与签名