fix(product_accounting): 折扣对齐正确模型，消除双重折扣+换正确模块

- 客户折扣: calculate_product_cost 的 amount 已含客户折扣，product_accounting 不再重复乘
- 供应商成本: 用 cost_result['cost'](含 supplychain 供应商折扣,基于原价)，不用 discount 模块的 get_min_supplier_discount
- 分销折扣: 用 supplychain calculate_sale_amounts 的 distribution_amount，不用 get_min_distributor_discount
- 供应商成本基于原价 original_amount，不再基于含客户折扣的售价

product_management/core.py

@@ -1543,6 +1543,8 @@ WHERE resource_ref_id = ${llm_id}$ AND product_type = 'llm_model' LIMIT 1"""
         if not cost_result or not cost_result.get('success'):
             raise Exception(f'calculate_product_cost failed: {cost_result}')
         raw_cost = cost_result.get('amount', 0)
+        original_amount = cost_result.get('original_amount', 0) or raw_cost
+        supplier_cost = cost_result.get('cost', 0) or raw_cost
 
         # 4b. Get product currency
         prod_currency = 'CNY'
@@ -1586,10 +1588,9 @@ WHERE resource_ref_id = ${llm_id}$ AND product_type = 'llm_model' LIMIT 1"""
         except Exception:
             chain = [ownerid]
 
-        # 7. Get customer discount (seller gives to customer)
-        cust_discount = await env.get_min_product_discount(
-            product_id, seller_orgid, userorgid)
-        customer_amount = cost_in_user * cust_discount
+        # 7. 客户售价：calculate_product_cost 的 amount 已含客户折扣（discount 模块），
+        #    这里不再重复乘，避免双重折扣。
+        customer_amount = cost_in_user
 
         # 8. Build accounting items for each link in chain
         # Chain: product_owner → ... → seller
@@ -1598,13 +1599,8 @@ WHERE resource_ref_id = ${llm_id}$ AND product_type = 'llm_model' LIMIT 1"""
         timestamp = time.strftime('%Y-%m-%d %H:%M:%S')
         orderid = getID()
 
-        # Determine supplier discount (for last link to provider)
-        last_link_discount = 1.0
-        try:
-            last_link_discount = await env.get_min_supplier_discount(
-                product_id, ownerid, providerid)  # supplier discount from product owner
-        except Exception:
-            pass
+        # 供应商成本：calculate_product_cost 的 cost 已含 supplychain 供应商折扣（基于原价）。
+        # 不用 discount 模块的 get_min_supplier_discount（供应商折扣归 supplychain 管）。
 
         accounting_items = []
 
@@ -1619,8 +1615,8 @@ WHERE resource_ref_id = ${llm_id}$ AND product_type = 'llm_model' LIMIT 1"""
                     productid=product_id, transamt=customer_amount,
                     currency=user_currency, base_amount=round(customer_amount, 2),
                     variable={"交易金额": customer_amount, "交易币种": user_currency, "交易手续费": 0}))
-            # PAY*: owner → supplier, amount = raw_cost * supplier_discount
-            supplier_amount = raw_cost * last_link_discount
+            # PAY*: owner → supplier, amount = supplier_cost（含 supplychain 供应商折扣）
+            supplier_amount = supplier_cost
             accounting_items.append(DictObject(
                 action='PAY*', customerid=ownerid, resellerid=ownerid,
                 providerid=providerid, biz_date=biz_date, timestamp=timestamp,
@@ -1643,14 +1639,25 @@ WHERE resource_ref_id = ${llm_id}$ AND product_type = 'llm_model' LIMIT 1"""
                             variable={"交易金额": customer_amount, "交易币种": user_currency, "交易手续费": 0}))
                 else:
                     # Middle link: PAY*
+                    # 分销折扣从 supplychain 查（distribution_agreement_items），
+                    # 不用 discount 模块的 get_min_distributor_discount。
                     next_orgid = chain[i + 1]
-                    up_discount = 1.0
+                    link_amount = raw_cost
                     try:
-                        up_discount = await env.get_min_distributor_discount(
-                            product_id, next_orgid, orgid)
+                        sc = await env.calculate_sale_amounts(None, {
+                            'resellerid': next_orgid,
+                            'sub_reseller_id': orgid,
+                            'productid': product_id,
+                            'prodtypeid': '',
+                            'quantity': 1,
+                            'unit_price': original_amount,
+                        })
+                        if sc:
+                            scd = json.loads(sc) if isinstance(sc, str) else sc
+                            scd = scd.get('data', {}) if isinstance(scd, dict) else {}
+                            link_amount = float(scd.get('distribution_amount', raw_cost) or raw_cost)
                     except Exception:
                         pass
-                    link_amount = raw_cost * up_discount
                     accounting_items.append(DictObject(
                         action='PAY*', customerid=orgid, resellerid=next_orgid,
                         providerid=providerid, biz_date=biz_date, timestamp=timestamp,
@@ -1658,7 +1665,7 @@ WHERE resource_ref_id = ${llm_id}$ AND product_type = 'llm_model' LIMIT 1"""
                         currency=prod_currency, base_amount=round(link_amount, 2),
                         variable={"分销结算": link_amount, "结算币种": prod_currency}))
             # Final PAY*: top of chain → supplier
-            supplier_amount = raw_cost * last_link_discount
+            supplier_amount = supplier_cost
             accounting_items.append(DictObject(
                 action='PAY*', customerid=chain[0], resellerid=chain[0],
                 providerid=providerid, biz_date=biz_date, timestamp=timestamp,