feat(core): 基础资产 Agent 化 — 商品三视图(image_edit 参考主图)+ 人物立绘/三视图异步生成 + 演员库/详情

- 商品三视图:有真实商品主图时走 image_edit,以主图为参考锁包装一致(品牌字/配色/外形/Logo)
- 人物:据「某一版立绘」异步生成配套三视图(image_edit,worker 内跑),立绘/三视图各存版本可切换
- 基础资产出图改异步(run_base_asset_task / generate_triview_task),Web 层不被慢出图占住
- 前端:演员库浏览/新增、人物详情(立绘+三视图+版本切换/下载/查看大图)、按 busyKey 的单卡并发 loading(genBusy,替代全局 genBusyKey,各按钮互不阻塞)
- dev:本地连云端 MySQL 复用连接(CONN_MAX_AGE/health check/connect_timeout),仅 development 生效
- 含 projects 测试补充

tsc + py_compile + 26 后端测试通过。

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

core/backend/apps/projects/views.py

@@ -228,12 +228,15 @@ class ProjectViewSet(TeamScopedViewSetMixin, ModelViewSet):
         kind = request.data.get("kind")
         if kind not in BaseAssetGroup.Kind.values:
             return Response({"detail": "invalid base asset kind"}, status=status.HTTP_400_BAD_REQUEST)
-        group = generate_base_asset(project=project, user=request.user, kind=kind, prompt=request.data.get("prompt", ""), label=request.data.get("label", ""))
+        try:
+            task = generate_base_asset(project=project, user=request.user, kind=kind, prompt=request.data.get("prompt", ""), label=request.data.get("label", ""))
+        except ValueError as exc:  # 无可用模型 / 余额不足等,立即反馈
+            return Response({"detail": str(exc)}, status=status.HTTP_400_BAD_REQUEST)
         stage, _ = ProjectStage.objects.get_or_create(project=project, stage=ProjectStage.Stage.BASE_ASSETS)
         stage.status = ProjectStage.Status.NEEDS_REVIEW
         stage.save(update_fields=["status", "updated_at"])
-        promote_base_asset_stage_if_ready(project)
-        return Response(BaseAssetGroupSerializer(group).data, status=status.HTTP_201_CREATED)
+        # 异步:出图在 worker 里跑,秒回 RESERVED 任务,前端轮询 /api/ai/generate-image/?ids=… 取结果后刷新项目
+        return Response({"task": {"id": str(task.id), "status": task.status}}, status=status.HTTP_202_ACCEPTED)
 
     @action(detail=True, methods=["post"], url_path="poll-reviews")
     def poll_reviews(self, request, pk=None):
@@ -276,15 +279,17 @@ 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)。"""
+        require_worker()  # 异步出图依赖 worker 兜底执行,没 worker 直接拒绝(否则任务永远 RESERVED)
         project = self.get_object()
         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_asset=portrait_asset)
+            task = 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)
+        # 异步:image_edit 出图在 worker 里跑,秒回 RESERVED 任务,前端轮询取结果后刷新项目即见三视图
+        return Response({"task": {"id": str(task.id), "status": task.status}}, status=status.HTTP_202_ACCEPTED)
 
     # ── Stage 1 · 镜头脚本逐字段编辑 / 增删分镜 ──