refactor(core): 基础资产改对逻辑+对齐设计稿(一组多版本候选 + 详情弹窗 asset-detail-grid)

逻辑(后端):用 BaseAssetGroup 本来的设计,不再每次生成新建组
- generate_base_asset 复用同实体的组(商品=唯一商品组;人物/场景按 label):追加 candidate + 采用最新
- 版本 = candidate_assets,采用/当前 = adopted_asset;采用/切换走真 adopt-base-asset(下游只认 adopted)
- 人物三视图绑定到「某一版立绘 asset」:metadata.triview_of=<立绘 asset id>,同立绘多次=同组追加候选
- generate-triview 端点改取 portrait_asset_id;attach-base-asset 坏参数 404 加固

设计(前端):
- 人物/场景卡对齐设计稿(.prompt-box 可编辑 + 重跑/替换 + 转圈态,区头 N 个 + 克制「+ 新增」)
- 详情弹窗整套换成设计稿 asset-detail-grid:左大立绘(3:4)+版本缩略条;右三视图 section(16:9 + 重跑/下载 + 单张大图 + 暂无 tip + v1/v2 版本条)+ 提示词 section;脚部 下载立绘 + 使用该资产;场景无三视图
- 商品三视图内联面板版本=candidate_assets、采用走真 adopt
- 修:.thumb/.v-thumb/.h-thumb 非 .placeholder 导致缩略图不显图 → 接 --mock-media-url

本地 playwright 截图实测:基础资产卡 + 详情弹窗均按设计稿渲染。

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

core/backend/apps/projects/views.py

@@ -275,13 +275,13 @@ class ProjectViewSet(TeamScopedViewSetMixin, ModelViewSet):
 
     @action(detail=True, methods=["post"], url_path="generate-triview")
     def generate_triview(self, request, pk=None):
-        """流程步骤4 · 据某一版立绘生成它配套的三视图(image_edit 锁角色一致性)。"""
+        """流程步骤4 · 据某一版立绘资产生成它配套的三视图(image_edit 锁角色一致性,三视图绑定该立绘)。"""
         project = self.get_object()
-        portrait = BaseAssetGroup.objects.filter(project=project, id=request.data.get("portrait_group_id")).first()
-        if portrait is None:
-            return Response({"detail": "portrait group not found"}, status=status.HTTP_404_NOT_FOUND)
+        portrait_asset = Asset.objects.filter(team=project.team, id=request.data.get("portrait_asset_id")).first()
+        if portrait_asset is None:
+            return Response({"detail": "portrait asset not found"}, status=status.HTTP_404_NOT_FOUND)
         try:
-            group = generate_person_triview(project=project, user=request.user, portrait_group=portrait)
+            group = generate_person_triview(project=project, user=request.user, portrait_asset=portrait_asset)
         except ValueError as exc:
             return Response({"detail": str(exc)}, status=status.HTTP_400_BAD_REQUEST)
         return Response(BaseAssetGroupSerializer(group).data, status=status.HTTP_201_CREATED)