refactor: rename package scope from @sexy.pivoine.art to @sexy

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

packages/backend/src/graphql/types/index.ts

@@ -22,7 +22,7 @@ import type {
   RecentPoint,
   UserGamification,
   Achievement,
-} from "@sexy.pivoine.art/types";
+} from "@sexy/types";
 
 type AdminUserDetail = User & { photos: ModelPhoto[] };
 import { builder } from "../builder";