feat: pricing_program add currency field (provider settlement currency)

models/pricing_program.json

@@ -44,6 +44,13 @@
             "name": "description",
             "title": "描述",
             "type": "text"
+        },
+        {
+            "name": "currency",
+            "title": "结算币种",
+            "type": "str",
+            "length": 3,
+            "default": "CNY"
         }
     ],
     "codes": [
@@ -65,6 +72,12 @@
             "valuefield": "k",
             "textfield": "v",
             "cond": "parentid='pricing_belong'"
+        },
+        {
+            "field": "currency",
+            "table": "currency",
+            "valuefield": "id",
+            "textfield": "name"
         }
     ]
 }