fix: discount_detail_create get discountid from params/query/referer

wwwroot/api/discount_detail_create.dspy

@@ -7,6 +7,18 @@ try:
     data = dict(params_kw)
     data['id'] = uuid()
     data['resellerid'] = user_orgid
+    # discountid从多处获取(子表场景): params_kw > request.query > Referer头
+    if not data.get('discountid'):
+        data['discountid'] = request.query.get('discountid', '')
+    if not data.get('discountid'):
+        referer = request.headers.get('Referer', '')
+        if 'discountid=' in referer:
+            for part in referer.split('?')[-1].split('&'):
+                if part.startswith('discountid='):
+                    data['discountid'] = part.split('=', 1)[1]
+                    break
+    if not data.get('discountid'):
+        raise Exception('discountid不能为空，请从折扣方案进入')
 
     async with DBPools().sqlorContext(dbname) as sor:
         await sor.C('discount_detail', data)