feat(admin): add column sorting and reset pagination on search (#927)

* feat(admin): add column sorting and reset pagination on search (#918)

- Add server-side column sorting for admin address list (ID, name, created_at, updated_at, mail_count, send_count)
- Reset pagination to page 1 when searching or changing sort order
- Add optional orderBy parameter to handleListQuery with whitelist validation

Closes #918

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* docs: add JSDoc warning for orderBy parameter in handleListQuery

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* fix: address code review findings

- Fix count not resetting to 0 when search returns empty results
- Add source_meta column sorting support
- Use Object.hasOwn to prevent prototype pollution in sort column lookup

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

CHANGELOG.md

@@ -10,6 +10,7 @@
 
 ### Features
 
+- feat: |Admin| 管理后台账号列表支持按列排序（ID、名称、创建时间、更新时间、邮件数量、发送数量），搜索时自动重置分页到第1页（#918）
 - feat: |Admin API| `/admin/new_address` 接口返回值新增 `address_id` 字段，避免创建后需再次查询地址 ID（#912）
 - feat: |自动回复| 发件人过滤支持正则表达式匹配，使用 `/pattern/` 语法（如 `/@example\.com$/`），同时保持前缀匹配的向后兼容
 - feat: |Turnstile| 新增全局登录表单 Turnstile 人机验证，通过 `ENABLE_GLOBAL_TURNSTILE_CHECK` 环境变量控制（#767）