fix:合同变更时，判断当前合同区间开始月是否有工作记录

src/views/business/crm/order/form.vue

@@ -217,7 +217,7 @@
                         <el-col :span="4" style="padding-top: 18px">
                           <el-form-item label="服务月数">
                             <el-input-number v-if="editStatus" v-model="item.serviceNum" :step="1" step-strictly
-                                             :min="0" :disabled="item.disabled" :controls="false" @change="
+                                             :min="0" :disabled="item.monthDisabled" :controls="false" @change="
                                 (arg) =>
                                   inputChangeHandler(
                                     'loop',
@@ -232,7 +232,7 @@
                         <el-col :span="4" style="padding-top: 18px">
                           <el-form-item label="赠送月数">
                             <el-input-number v-if="editStatus" v-model="item.freeNum" :step="1" step-strictly :min="0"
-                                             :disabled="item.disabled"     :controls="false" @change="
+                                             :disabled="item.monthDisabled"     :controls="false" @change="
                                 (arg) =>
                                   inputChangeHandler(
                                     'loop',