feat: scaffold center and guild backend NestJS skeletons

Fabric.Backend.Guild/src/messaging/messaging.module.ts

@@ -0,0 +1,7 @@
+import { Module } from '@nestjs/common';
+import { MessagingController } from './messaging.controller';
+
+@Module({
+  controllers: [MessagingController],
+})
+export class MessagingModule {}