feat(mileage): 外部三选筛选 + 车牌多选粘贴 + 运营区域 + xlsx 下载

- 外部行改为 批次型号 / 运营区域 / 车牌多选；按部门、按客户移入详情面板
- 车牌多选支持从 Excel 粘贴（换行/逗号/空格分隔），未匹配项显示警告
- 新增运营区域筛选：基于 136 批次区域映射（华东/华南/西南/西北）
- 新增 xlsx 数据下载，导出当前筛选结果（带表头样式与列宽）

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/modules/mileage/xlsx-export.ts

@@ -0,0 +1,81 @@
+import * as XLSX from 'xlsx';
+import type { MonitoringVehicle } from './types';
+
+interface ExportContext {
+  date: string;
+  sortBy: 'today' | 'total';
+}
+
+const HEADERS = [
+  '状态', '车牌号', '客户', '业务部门', '项目', '租赁状态',
+  '运营区域', '今日里程(km)', '累计里程(km)',
+] as const;
+
+function statusLabel(v: MonitoringVehicle): string {
+  if (!v.isDataSynced) return '未对接';
+  return v.isOnline ? '在线' : '离线';
+}
+
+function mileageCell(v: MonitoringVehicle, kind: 'today' | 'total'): string | number {
+  if (!v.isDataSynced) return '未对接';
+  if (kind === 'today') return Math.max(0, Math.round(v.dailyKm || 0));
+  return v.totalKm != null ? Math.round(v.totalKm) : '未对接';
+}
+
+export function exportMileageXlsx(vehicles: MonitoringVehicle[], ctx: ExportContext): void {
+  const data: (string | number)[][] = [
+    [...HEADERS],
+    ...vehicles.map(v => [
+      statusLabel(v),
+      v.plate,
+      v.customer || '',
+      v.department || '',
+      v.project || '',
+      v.rentStatus || '',
+      v.region || '',
+      mileageCell(v, 'today'),
+      mileageCell(v, 'total'),
+    ]),
+  ];
+
+  const ws = XLSX.utils.aoa_to_sheet(data);
+
+  ws['!cols'] = [
+    { wch: 8 },   // 状态
+    { wch: 12 },  // 车牌号
+    { wch: 28 },  // 客户
+    { wch: 14 },  // 业务部门
+    { wch: 16 },  // 项目
+    { wch: 10 },  // 租赁状态
+    { wch: 12 },  // 运营区域
+    { wch: 14 },  // 今日里程
+    { wch: 14 },  // 累计里程
+  ];
+
+  ws['!freeze'] = { xSplit: 0, ySplit: 1 } as never;
+
+  // 表头样式（在客户端 SheetJS 社区版仅基本样式生效）
+  for (let c = 0; c < HEADERS.length; c++) {
+    const ref = XLSX.utils.encode_cell({ r: 0, c });
+    if (ws[ref]) {
+      (ws[ref] as { s?: unknown }).s = {
+        font: { bold: true, color: { rgb: 'FFFFFF' } },
+        fill: { fgColor: { rgb: '2563EB' } },
+        alignment: { horizontal: 'center', vertical: 'center' },
+      };
+    }
+  }
+
+  const wb = XLSX.utils.book_new();
+  XLSX.utils.book_append_sheet(wb, ws, '里程明细');
+
+  const now = new Date();
+  const y = now.getFullYear();
+  const m = String(now.getMonth() + 1).padStart(2, '0');
+  const d = String(now.getDate()).padStart(2, '0');
+  const hh = String(now.getHours()).padStart(2, '0');
+  const mm = String(now.getMinutes()).padStart(2, '0');
+  const dateTag = ctx.date ? ctx.date.replace(/-/g, '') : `${y}${m}${d}`;
+  const filename = `里程看板_${dateTag}_${hh}${mm}_${ctx.sortBy === 'today' ? '今日' : '累计'}.xlsx`;
+  XLSX.writeFile(wb, filename);
+}