doll active state <-> doll stream toggle

src/users/events/user.events.ts

@@ -0,0 +1,11 @@
+import { Doll } from '@prisma/client';
+
+export const UserEvents = {
+  ACTIVE_DOLL_CHANGED: 'user.active-doll.changed',
+} as const;
+
+export interface UserActiveDollChangedEvent {
+  userId: string;
+  dollId: string | null;
+  doll: Doll | null;
+}