Restructure backend into modular API layers with admin/organizador/invitados routes, add role-based middleware, flatten module models, and update build scripts

packages/legacy/src/gift/gift.registration.ts

@@ -0,0 +1,16 @@
+import { Injectable, OnModuleInit } from '@nestjs/common';
+import { ModuleRegistryService } from '../core/services/module-registry.service';
+
+@Injectable()
+export class GiftModuleRegistration implements OnModuleInit {
+  constructor(private readonly moduleRegistry: ModuleRegistryService) {}
+
+  onModuleInit() {
+    this.moduleRegistry.registerModule({
+      key: 'gift',
+      name: 'Regalos',
+      description: 'Gestión de lista de regalos, aportes individuales y grupales.',
+      routePrefix: '/gift',
+    });
+  }
+}