✨ 合同结算币种联动计费与运单计价单位，并完善合同与派车交互

结算币种驱动计费单价单位及运单/计划/总单计价单位；同步合同编号预览、部门前缀配置、派车备注与查看弹窗等交互优化。

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

src/views/business/components/billing-plan-editor.vue

@@ -171,7 +171,7 @@
               :label="item.label"
               :value="item.value" /></el-select></template
       ></el-table-column>
-      <el-table-column label="单价（元）" width="180"
+      <el-table-column :label="unitPriceColumnLabel" width="180"
         ><template #default="{ row }"
           ><div v-if="readonly && usesRangeUnitPrice(row)" class="limit-list">
             <span v-for="(item, rangeIndex) in getRanges(row)" :key="rangeIndex">{{
@@ -379,6 +379,7 @@ import { getLazyTree as getRegionLazyTree } from '@/api/base/region';
 import { InfoFilled } from '@element-plus/icons-vue';
 import { getDictionary } from '@/api/system/dictbiz';
 import SectionCard from '@/components/section-card/main.vue';
+import { currencyUnit } from '@/utils/currency';
 
 const clone = value => JSON.parse(JSON.stringify(value));
 /** 计费要素与计量单位维度的对应关系（这些要素可选计费单位） */
@@ -431,6 +432,7 @@ export default {
     value: { type: Object, default: () => ({}) },
     index: { type: Number, default: -1 },
     readonly: Boolean,
+    settlementCurrency: { type: String, default: 'RMB' },
   },
   emits: ['update:modelValue', 'save'],
   data() {
@@ -500,6 +502,9 @@ export default {
         emitPath: true,
       };
     },
+    unitPriceColumnLabel() {
+      return `单价（${currencyUnit(this.settlementCurrency)}）`;
+    },
   },
   mounted() {
     this.loadDictionaries();