✨ feat(mana-notify): add central notification service

NestJS notification microservice for email, push, Matrix, and webhook
notifications across all ManaCore apps.

Features:
- Multi-channel delivery (email, push, Matrix, webhook)
- Handlebars template engine with defaults
- User notification preferences
- BullMQ async job processing
- Delivery tracking and logging
- Prometheus metrics

Includes @manacore/notify-client package for NestJS integration.

services/mana-notify/src/queue/queue.module.ts

@@ -0,0 +1,73 @@
+import { Module } from '@nestjs/common';
+import { BullModule } from '@nestjs/bullmq';
+import { EmailProcessor } from './processors/email.processor';
+import { PushProcessor } from './processors/push.processor';
+import { MatrixProcessor } from './processors/matrix.processor';
+import { WebhookProcessor } from './processors/webhook.processor';
+import { ChannelsModule } from '../channels/channels.module';
+import { MetricsModule } from '../metrics/metrics.module';
+
+export const EMAIL_QUEUE = 'email';
+export const PUSH_QUEUE = 'push';
+export const MATRIX_QUEUE = 'matrix';
+export const WEBHOOK_QUEUE = 'webhook';
+
+@Module({
+	imports: [
+		BullModule.registerQueue(
+			{
+				name: EMAIL_QUEUE,
+				defaultJobOptions: {
+					attempts: 3,
+					backoff: {
+						type: 'exponential',
+						delay: 5000,
+					},
+					removeOnComplete: 100,
+					removeOnFail: 1000,
+				},
+			},
+			{
+				name: PUSH_QUEUE,
+				defaultJobOptions: {
+					attempts: 3,
+					backoff: {
+						type: 'exponential',
+						delay: 1000,
+					},
+					removeOnComplete: 100,
+					removeOnFail: 1000,
+				},
+			},
+			{
+				name: MATRIX_QUEUE,
+				defaultJobOptions: {
+					attempts: 3,
+					backoff: {
+						type: 'exponential',
+						delay: 2000,
+					},
+					removeOnComplete: 100,
+					removeOnFail: 500,
+				},
+			},
+			{
+				name: WEBHOOK_QUEUE,
+				defaultJobOptions: {
+					attempts: 5,
+					backoff: {
+						type: 'exponential',
+						delay: 3000,
+					},
+					removeOnComplete: 100,
+					removeOnFail: 1000,
+				},
+			}
+		),
+		ChannelsModule,
+		MetricsModule,
+	],
+	providers: [EmailProcessor, PushProcessor, MatrixProcessor, WebhookProcessor],
+	exports: [BullModule],
+})
+export class QueueModule {}