fix: 部门统计未分配部门改为显示"公务车"，排序放最后

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

src/server/routes/vehicles.ts

@@ -685,7 +685,7 @@ app.get('/dept-stats', async (c) => {
 
   const deptMap = new Map<string, Map<string, Vehicle[]>>();
   for (const v of withManager) {
-    const dept = v.departmentName || '未分配';
+    const dept = v.departmentName || '公务车';
     const mgr = v.customerManager || '未分配';
     if (!deptMap.has(dept)) deptMap.set(dept, new Map());
     const mgrMap = deptMap.get(dept)!;
@@ -733,6 +733,7 @@ app.get('/dept-stats', async (c) => {
     // 按部门名中的数字排序（业务一部=1, 业务二部=2, ...）
     const numMap: Record<string, number> = { '一': 1, '二': 2, '三': 3, '四': 4, '五': 5, '六': 6, '七': 7, '八': 8, '九': 9, '十': 10 };
     const getNum = (name: string) => {
+      if (name === '公务车') return 100;
       const m = name.match(/[一二三四五六七八九十]/);
       return m ? (numMap[m[0]] || 99) : 99;
     };