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/ai/views.py

@@ -62,7 +62,9 @@ class GenerateImageView(APIView):
 
 
 class AITaskViewSet(TeamScopedViewSetMixin, ReadOnlyModelViewSet):
-    queryset = AITask.objects.select_related("team", "project", "model_config", "model_config__provider").all()
+    # 序列化器不含 request_payload/response_payload(单条可达 3MB+ base64 图),defer 掉:
+    # 否则只为序列化 14 个小字段也会把几十 MB blob 从库里拉回(远程库实测 40 条要 30s+)。
+    queryset = AITask.objects.select_related("team", "project", "model_config", "model_config__provider").defer("request_payload", "response_payload").all()
     serializer_class = AITaskSerializer
     search_fields = ["idempotency_key", "provider_task_id", "project__name"]
     ordering_fields = ["created_at", "updated_at", "completed_at"]