feat: 迁移 accounts 模块批次 1 到 controllers 层
迁移的路由（12个）：
- 基础 CRUD：api_get_accounts, api_get_account, api_add_account,
api_update_account, api_delete_account, api_delete_account_by_email
- 批量操作：api_search_accounts, api_batch_update_account_group,
api_batch_delete_accounts, api_batch_manage_tags
- 导出功能：api_export_all_accounts, api_export_selected_accounts,
api_generate_export_verify_token
修复：
- parse_account_string 函数支持 refresh_token 包含 '----' 分隔符
- api_generate_export_verify_token 使用正确的 auth 模块函数
剩余 accounts 模块路由（8个）暂保留 legacy 实现：
- Token 刷新相关：refresh, refresh-all, retry-refresh, refresh-failed
- 刷新日志相关：refresh-logs, account-refresh-logs, refresh-stats, trigger-scheduled-refresh
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
