✨ 业务数量单位改走计量单位，并放开运输计划日期必填

发货模板、运输计划、运单与总单调度从计量单位取 unitName；修复调度提交顶层单位为空，并取消计划开始/结束日期必填。

Co-authored-by: Cursor <cursoragent@cursor.com>

src/views/business/components/master-order-dispatch.vue

@@ -317,6 +317,7 @@
 <script>
 import * as api from '@/api/business/master-order';
 import { fetchDriversByCarrierOrganizations } from '@/utils/carrier-org-resource';
+import { loadMeasurementUnitOptions } from '@/utils/measurement-unit';
 import { isMobile } from '@/utils/validate';
 
 const unwrapRecords = res => {
@@ -347,7 +348,8 @@ export default {
       carrierLoading: false,
       driverLoading: false,
       escortLoading: false,
-      quantityUnitOptions: ['吨', '千克', '立方米', '件', '车', '箱', '托盘'],
+      quantityUnitOptions: [],
+      quantityUnitLoading: false,
     };
   },
   computed: {
@@ -389,10 +391,24 @@ export default {
     },
   },
   async mounted() {
+    await this.loadQuantityUnitOptions();
     await Promise.all([this.load(), this.loadCarrierOptions()]);
     this.applySelfOperatedCarrierDefaults();
   },
   methods: {
+    loadQuantityUnitOptions() {
+      if (this.quantityUnitLoading) return this.quantityUnitLoadPromise;
+      this.quantityUnitLoading = true;
+      this.quantityUnitLoadPromise = loadMeasurementUnitOptions()
+        .then(options => {
+          this.quantityUnitOptions = options.map(item => item.value);
+          return this.quantityUnitOptions;
+        })
+        .finally(() => {
+          this.quantityUnitLoading = false;
+        });
+      return this.quantityUnitLoadPromise;
+    },
     async load() {
       if (!this.id) return;
       this.loading = true;