邮件：定时循环邮件

shared/db/ServerMail.ts

@@ -33,6 +33,7 @@ export default class ServerMail extends MailTemp {
         const result: ServerMailType[] = await ServerMailModel.find({ 
             serverId,
             delRoles: { $ne: roleId },
+            sendTime: { $lte: nowSeconds() } ,
             endTime: { $gte: nowSeconds() } 
         }).populate('mail').lean();
         return result;