fix(forecast): 修正年月字段格式并移除排序功能

src/views/forecast/index.vue

@@ -152,12 +152,12 @@ export default {
             label: '年月',
             prop: 'yearMonth',
             type: 'month',
-            format: 'yyyy-MM',
-            valueFormat: 'yyyy-MM',
+            format: 'yyyyMM',
+            valueFormat: 'yyyyMM',
             search: true,
             searchSpan: 6,
             width: 120,
-            sortable: true,
+            // sortable: true,
             rules: [{
               required: true,
               message: '请选择年月',