fix: user invite email not sending and null variables

- Add missing BullModule queue registration and BullBoardModule to UsersModule
- Add invitingUser to event payloads to track who sent the invite
- Fix incorrect global variable in SendInviteUsersMailMessage (__views_dir -> __images_dirname)
- Use invitingUser as fromUser instead of invited user in email
- Update processors to use BullMQ pattern

Fixes issues:
1. Email not sending due to missing queue/processor registration
2. Null variables in email (firstName/lastName) because fromUser was the invited user
3. Image attachment failing due to wrong path

packages/server/src/modules/UsersModule/subscribers/InviteSendMailNotification.subscriber.ts

@@ -1,6 +1,6 @@
 import { Injectable } from '@nestjs/common';
-import { InjectQueue } from '@nestjs/bull';
-import { Queue } from 'bull';
+import { InjectQueue } from '@nestjs/bullmq';
+import { Queue } from 'bullmq';
 import { events } from '@/common/events/events';
 import { OnEvent } from '@nestjs/event-emitter';
 import {
@@ -29,6 +29,7 @@ export default class InviteSendMainNotificationSubscribe {
   async sendMailNotification({
     invite,
     user,
+    invitingUser,
   }: IUserInviteTenantSyncedEventPayload) {
     const tenant = await this.tenancyContext.getTenant();
     const authedUser = await this.tenancyContext.getSystemUser();
@@ -37,7 +38,7 @@ export default class InviteSendMainNotificationSubscribe {
     const userId = authedUser.id;
 
     this.sendInviteMailQueue.add(SendInviteUserMailJob, {
-      fromUser: user,
+      fromUser: invitingUser,
       invite,
       userId,
       organizationId,