fix(退款信息表单): 优化退款模型选择时的表单验证逻辑，确保在特定条件下正确提示用户

src/views/refund/gold/addCoinRefund.vue

@@ -218,7 +218,7 @@ const rules = reactive({
     { required: true, message: t('elmessage.checkPayModel'), trigger: 'blur' },
     {
       validator: (rule, value) => {
-        if (value === 0) {
+        if (addRefund.value.refundModel === 1 && value === 0) {
           return Promise.reject(new Error(t('elmessage.noTotalGoldZero')))
         }
         return Promise.resolve()
@@ -366,6 +366,9 @@ const handleRefundModelChange = () => {
     addRefund.value.freeGold = selectedGoodsGold.value.freeGold.toString();
     addRefund.value.taskGold = selectedGoodsGold.value.taskGold.toString();
   }
+  if (Ref.value) {
+    Ref.value.clearValidate('sumGold')
+  }
 }
 
 // 统一的输入处理函数