fix: DSPY sort alias pc.name→pc_name for sqlPaging compatibility

wwwroot/discount_setting/get_products_with_discount.dspy

@@ -14,7 +14,7 @@ ns = params_kw.copy()
 if not ns.get('page'):
     ns['page'] = 1
 if not ns.get('sort'):
-    ns['sort'] = 'category_name, product_name'
+    ns['sort'] = 'pc_name, product_name'
 
 ns['org_id'] = user_orgid
 
@@ -30,8 +30,9 @@ async with db.sqlorContext(dbname) as sor:
 sql = '''
 SELECT 
     p.id as productid,
-    p.product_code,
+    pc.name as pc_name,
     p.product_name,
+    p.product_code,
     p.category_id,
     pc.name as category_name,
     dd.id as detail_id,