feat(frontend): 优化弹窗组件架构和用户体验

- 使用 BaseDialog 替代旧版 Modal 组件
- 添加平滑过渡动画和更好的可访问性支持
- 新增 ExportProgressDialog 导出进度弹窗
- 优化所有账号管理和使用记录相关弹窗
- 更新国际化文案，改进用户交互体验
- 精简依赖，减少 package.json 体积

backend/internal/repository/usage_log_repo.go

@@ -182,6 +182,7 @@ func (r *usageLogRepository) GetDashboardStats(ctx context.Context) (*DashboardS
 			COUNT(CASE WHEN rate_limited_at IS NOT NULL AND rate_limit_reset_at > ? THEN 1 END) as ratelimit_accounts,
 			COUNT(CASE WHEN overload_until IS NOT NULL AND overload_until > ? THEN 1 END) as overload_accounts
 		FROM accounts
+		WHERE deleted_at IS NULL
 	`, service.StatusActive, service.StatusError, now, now).Scan(&accountStats).Error; err != nil {
 		return nil, err
 	}