隐藏式商品/类型增加归属商家端类型，点单按归属写入抢单字段；抢单池只返回商家端类型。

Co-authored-by: Cursor <cursoragent@cursor.com>

utils/shangpin_guishu.py

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+"""
+隐藏式商品/类型归属商家端类型：点单写入订单抢单字段时使用。
+"""
+from shangpin.models import ShangpinLeixing
+
+
+def parse_guishu_leixing_id(raw, shenhezhuangtai=None):
+    """
+    解析归属商家端类型 ID。
+    非隐藏式(4)一律视为无归属；有值时必须指向 shenhezhuangtai=3 的类型。
+    返回 (guishu_leixing_id|None, error_message|None)
+    """
+    try:
+        status = int(shenhezhuangtai) if shenhezhuangtai is not None else None
+    except (TypeError, ValueError):
+        status = None
+    if status is not None and status != 4:
+        return None, None
+
+    if raw is None or raw == '' or str(raw).lower() in ('null', 'none', 'undefined'):
+        return None, None
+    try:
+        gid = int(raw)
+    except (TypeError, ValueError):
+        return None, '归属商家端类型ID无效'
+    if gid <= 0:
+        return None, None
+    if not ShangpinLeixing.objects.filter(id=gid, shenhezhuangtai=3).exists():
+        return None, '归属类型必须是商家端商品类型（审核状态=3）'
+    return gid, None
+
+
+def resolve_order_qiangdan_fields(shangpin):
+    """
+    点单写入 Dingdan 的抢单相关字段：
+    - 商品或所属类型配置了 guishu_leixing_id → 用该商家端类型的 id/yaoqiuleixing/huiyuan_id/yongjin
+    - 否则沿用商品自身字段
+    """
+    guishu_id = getattr(shangpin, 'guishu_leixing_id', None)
+    if not guishu_id and getattr(shangpin, 'leixing_id', None):
+        own_type = ShangpinLeixing.objects.filter(id=shangpin.leixing_id).only(
+            'guishu_leixing_id',
+        ).first()
+        if own_type:
+            guishu_id = own_type.guishu_leixing_id
+
+    if guishu_id:
+        merchant = ShangpinLeixing.objects.filter(id=guishu_id, shenhezhuangtai=3).first()
+        if merchant:
+            return {
+                'leixing_id': merchant.id,
+                'yaoqiuleixing': merchant.yaoqiuleixing,
+                'huiyuan_id': merchant.huiyuan_id or '',
+                'yongjin': merchant.yongjin if merchant.yongjin is not None else 0,
+            }
+
+    return {
+        'leixing_id': shangpin.leixing_id,
+        'yaoqiuleixing': getattr(shangpin, 'yaoqiuleixing', None),
+        'huiyuan_id': getattr(shangpin, 'huiyuan_id', '') or '',
+        'yongjin': getattr(shangpin, 'yongjin', 0) or 0,
+    }