fix: tighten public work type routing

src/services/creationEntryConfigService.ts

@@ -1,8 +1,9 @@
+import type { PlatformCreationTypeId } from '../../packages/shared/src/contracts/playTypes';
 import { requestJson } from './apiClient';
 
 /** 后端下发的单个创作类型入口配置，前端只据此展示和分流。 */
 export type CreationEntryTypeConfig = {
-  id: string;
+  id: PlatformCreationTypeId;
   title: string;
   subtitle: string;
   badge: string;
@@ -27,7 +28,7 @@ export type UnifiedCreationField = {
 
 /** 统一创作工作台契约，把入口类型映射到工作台、生成页和结果页阶段。 */
 export type UnifiedCreationSpec = {
-  playId: string;
+  playId: PlatformCreationTypeId;
   title: string;
   workspaceStage: string;
   generationStage: string;