✨ 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/billing-plan-editor.vue

@@ -386,12 +386,15 @@ const BILLING_ELEMENT_DIMENSION_MAP = {
   按重量: '重量',
   按体积: '体积',
   按数量: '数量',
+  按里程: '里程',
+  '按吨·公里': '吨·公里',
+  '固定金额（整单一口价）': '整车',
 };
 const BILLING_UNIT_SELECTABLE_ELEMENTS = Object.keys(BILLING_ELEMENT_DIMENSION_MAP);
-/** 固定计费单位（不可编辑） */
-const FIXED_BILLING_UNIT_MAP = {
+/** 对应维度下无计量单位时的默认计费单位 */
+const DEFAULT_BILLING_UNIT_MAP = {
   按里程: '公里',
-  '按吨·公里': '吨公里',
+  '按吨·公里': '吨·公里',
   '固定金额（整单一口价）': '单',
 };
 const defaultRule = () => ({
@@ -652,58 +655,61 @@ export default {
         }),
       ]).finally(() => {
         this.unitLoading = false;
+        (this.draft.rules || []).forEach(row => this.syncBillingUnit(row));
       });
     },
     measurementDimension(billingElement) {
       return BILLING_ELEMENT_DIMENSION_MAP[billingElement] || '';
     },
-    fixedBillingUnit(billingElement) {
-      return FIXED_BILLING_UNIT_MAP[String(billingElement || '').trim()] || '';
+    defaultBillingUnit(billingElement) {
+      return DEFAULT_BILLING_UNIT_MAP[String(billingElement || '').trim()] || '';
     },
     canSelectBillingUnit(row) {
       return BILLING_UNIT_SELECTABLE_ELEMENTS.includes(String(row?.billingElement || '').trim());
     },
     billingUnitPlaceholder(row) {
       if (!row?.billingElement) return '请先选择计费要素';
-      if (this.fixedBillingUnit(row.billingElement)) return this.fixedBillingUnit(row.billingElement);
       if (!this.canSelectBillingUnit(row)) return '当前计费要素无需选择';
       return '请选择';
     },
     unitOptionsFor(row) {
-      const fixedUnit = this.fixedBillingUnit(row?.billingElement);
-      if (fixedUnit) {
-        return [{ id: fixedUnit, label: fixedUnit, value: fixedUnit }];
-      }
       if (!this.canSelectBillingUnit(row)) {
         return [];
       }
       const dimension = this.measurementDimension(row?.billingElement);
-      if (dimension) {
-        return this.measurementUnits
-          .filter(item => String(item.dimension || '').trim() === dimension)
-          .map(item => ({
-            id: item.id,
-            label: item.unitName,
-            value: item.unitName,
-          }))
-          .filter(item => item.value);
+      const defaultUnit = this.defaultBillingUnit(row?.billingElement);
+      const options = dimension
+        ? this.measurementUnits
+            .filter(item => String(item.dimension || '').trim() === dimension)
+            .map(item => ({
+              id: item.id,
+              label: item.unitName,
+              value: item.unitName,
+            }))
+            .filter(item => item.value)
+        : [];
+      // 对应维度未配置计量单位时，下拉仅展示默认值
+      if (!options.length && defaultUnit) {
+        return [{ id: `default-${defaultUnit}`, label: defaultUnit, value: defaultUnit }];
       }
-      return [];
+      return options;
     },
     syncBillingUnit(row) {
-      const fixedUnit = this.fixedBillingUnit(row?.billingElement);
-      if (fixedUnit) {
-        row.billingUnit = fixedUnit;
-        return;
-      }
       if (!this.canSelectBillingUnit(row)) {
         row.billingUnit = '';
         return;
       }
       const options = this.unitOptionsFor(row);
-      if (!options.some(item => String(item.value) === String(row.billingUnit || ''))) {
-        row.billingUnit = '';
+      const defaultUnit = this.defaultBillingUnit(row?.billingElement);
+      const current = String(row.billingUnit || '').trim();
+      if (options.some(item => String(item.value) === current)) {
+        return;
       }
+      if (defaultUnit && options.some(item => String(item.value) === defaultUnit)) {
+        row.billingUnit = defaultUnit;
+        return;
+      }
+      row.billingUnit = options[0]?.value || defaultUnit || '';
     },
     feeTypeKey(row) {
       const option = this.feeCategories.find(