feat(service): P2.3 Socket.io /message gateway + real SessionVerifier

open_thread (create-or-join) / send_message / read / delivered / typing; HS256
token verified on connect (SessionVerifier reuses AppTokenVerifier pattern);
OutboxBus bridge propagates REST/ingest messages to rooms (dedup vs inline emit).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

packages/iios-service/src/messaging/message.module.ts

@@ -1,8 +1,12 @@
 import { Module } from '@nestjs/common';
 import { MessageService } from './message.service';
+import { MessageGateway } from './message.gateway';
+import { SessionVerifier } from '../platform/session.verifier';
+import { OutboxModule } from '../outbox/outbox.module';
 
 @Module({
-  providers: [MessageService],
-  exports: [MessageService],
+  imports: [OutboxModule],
+  providers: [MessageService, MessageGateway, SessionVerifier],
+  exports: [MessageService, SessionVerifier],
 })
 export class MessageModule {}