fix: codes移除dbname，修正表名和字段名

- prodtypeid→product_category(name)
- productid→product(product_name)
- 所有表在同一数据库，不需要dbname

models/discount_detail.json

@@ -77,14 +77,12 @@
         },
         {
             "field": "prodtypeid",
-            "dbname": "product_management",
             "table": "product_category",
             "valuefield": "id",
             "textfield": "name"
         },
         {
             "field": "productid",
-            "dbname": "product_management",
             "table": "product",
             "valuefield": "id",
             "textfield": "product_name"