feat: scaffold center and guild backend NestJS skeletons

Fabric.Backend.Center/src/app.module.ts

@@ -0,0 +1,10 @@
+import { Module } from '@nestjs/common';
+import { HealthController } from './common/health.controller';
+import { AuthModule } from './auth/auth.module';
+import { NodesModule } from './nodes/nodes.module';
+
+@Module({
+  imports: [AuthModule, NodesModule],
+  controllers: [HealthController],
+})
+export class AppModule {}