fix(prefetch): 修正库存阈值默认值及校验逻辑

- 将库存阈值输入框最小值由1改为0，提示改为“库存阈值（默认为0）”
- 新增新增面额时库存容量默认值为0
- 修改校验逻辑，容量为空时自动设置为0
- 校验库存阈值不能小于0，提示信息相应更新
- 优化了面额和库存阈值的必填校验提示内容

src/views/camel-oil-info/prefetch/components/settings-form.vue

@@ -197,8 +197,8 @@
           <template #capacity="{ rowIndex }">
             <a-input-number
               v-model="formModel.targetDenominations[rowIndex].capacity"
-              :min="1"
-              placeholder="请输入库存阈值"
+              :min="0"
+              placeholder="库存阈值（默认为0）"
               style="width: 100%"
             />
           </template>
@@ -281,7 +281,7 @@ const columns: TableColumnData[] = [
 const addDenomination = () => {
   formModel.targetDenominations.push({
     denomination: null,
-    capacity: null
+    capacity: 0
   });
 };
 
@@ -323,12 +323,16 @@ const handleSubmit = async () => {
     ) {
       for (let i = 0; i < formModel.targetDenominations.length; i++) {
         const item = formModel.targetDenominations[i];
-        if (!item.denomination || !item.capacity) {
-          Message.warning(`请完善第${i + 1}个面额设置的必填项`);
+        if (!item.denomination) {
+          Message.warning(`请填写第${i + 1}个面额设置的面额值`);
           return;
         }
-        if (item.capacity < 1) {
-          Message.warning(`第${i + 1}个面额设置的库存阈值必须大于0`);
+        if (item.capacity === null || item.capacity === undefined) {
+          // capacity为空时默认设置为0
+          item.capacity = 0;
+        }
+        if (item.capacity < 0) {
+          Message.warning(`第${i + 1}个面额设置的库存阈值不能小于0`);
           return;
         }
       }