修复精选栏用户id显示

公开精选资源接口透传 ownerUserId

精选模型使用 ownerUserId 作为作者兜底

补充前后端回归测试和相关文档

src/components/creation-home/creationShowcaseModel.test.ts

@@ -76,6 +76,23 @@ describe('creationShowcaseModel', () => {
     expect(items[0]?.label).toBe('公开素材');
   });
 
+  it('uses the public project resource owner user id as showcase author fallback', () => {
+    const items = buildCreationShowcaseItems({
+      activeTab: 'characters',
+      projectResources: [
+        createResource({
+          resourceId: 'owner-resource',
+          label: '作者兜底素材',
+          assetKind: 'character',
+          ownerUserId: 'user-author-1',
+        }),
+      ],
+    });
+
+    expect(items).toHaveLength(1);
+    expect(items[0]?.author).toBe('user-author-1');
+  });
+
   it('deduplicates canvas copies that point back to the same generated resource', () => {
     const items = buildCreationShowcaseItems({
       activeTab: 'characters',

src/components/creation-home/creationShowcaseModel.ts

@@ -68,6 +68,7 @@ const SHOWCASE_AUTHOR_KEYS = [
   'ownerLabel',
   'ownerName',
   'authorDisplayName',
+  'ownerUserId',
 ] as const;
 
 export const SHOWCASE_TABS: Array<{ id: ShowcaseTabId; label: string }> = [