fix: 部门出勤/闲置下钻改为基于当日里程区分

- 后端/list新增attendance参数(active/idle)，查询当日里程表区分
  出勤(mileage>0)和闲置(mileage=0)，仅对Operating车辆生效
- 前端部门Tab出勤/闲置点击改用attendance:'active'/'idle'替代
  原来错误的category:'Operating'/'Inventory'
- 修复department='公务车'过滤：匹配departmentName为null的车辆
- 前端API层新增attendance参数传递

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/server/routes/vehicles.ts

@@ -858,9 +858,22 @@ const VEHICLE_TYPE_FILTERS: Record<string, (v: Vehicle) => boolean> = {
 // GET /api/vehicles/list — flat list with optional filters
 app.get('/list', async (c) => {
   const vehicles = await getVehicles();
-  const { batch, model, location, status, category, vehicleType, manager, customer, isColdChain, isTrailer, department } = c.req.query();
+  const { batch, model, location, status, category, vehicleType, manager, customer, isColdChain, isTrailer, department, attendance } = c.req.query();
 
   let filtered = vehicles;
+
+  // attendance filter: active = today mileage > 0, idle = today mileage = 0 (only for Operating vehicles)
+  if (attendance === 'active' || attendance === 'idle') {
+    const [todayRows] = await pool.query<any[]>(`SELECT plateNumber, dayMileage FROM ln_vehicle_day_mileage WHERE dates = CURDATE()`);
+    const todayMap = new Map<string, number>();
+    for (const row of todayRows as any[]) todayMap.set(row.plateNumber, Number(row.dayMileage));
+    filtered = filtered.filter((v) => v.status === 'Operating');
+    if (attendance === 'active') {
+      filtered = filtered.filter((v) => (todayMap.get(v.plateNumber) || 0) > 0);
+    } else {
+      filtered = filtered.filter((v) => (todayMap.get(v.plateNumber) || 0) === 0);
+    }
+  }
   if (vehicleType) {
     if (VEHICLE_TYPE_FILTERS[vehicleType]) {
       filtered = filtered.filter(VEHICLE_TYPE_FILTERS[vehicleType]);
@@ -904,7 +917,7 @@ app.get('/list', async (c) => {
     filtered = filtered.filter((v) => customer === '未分配客户' ? !v.customerName : v.customerName === customer);
   }
   if (department) {
-    filtered = filtered.filter((v) => v.departmentName === department);
+    filtered = filtered.filter((v) => department === '公务车' ? !v.departmentName : v.departmentName === department);
   }
   if (isColdChain !== undefined) {
     const wantCold = isColdChain === 'true';