fix: KPI统计跟随筛选条件变化+客户筛选修正+部门排序

- KPI统计（总里程/平均单车/监控台数）改为基于筛选后数据计算
- 移除不需要的 onlineCount 字段
- 快捷筛选"按客户"和全屏表格"客户"列改为真正的客户筛选
- 删除混乱的 projects 变量映射
- 部门列表按 一部→二部→三部 顺序排序

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

src/modules/mileage/MonitoringView.tsx

@@ -106,7 +106,7 @@ export default function MonitoringView() {
   const [appliedMileageRange, setAppliedMileageRange] = useState({ min: '', max: '' });
 
   const [vehicles, setVehicles] = useState<MonitoringVehicle[]>([]);
-  const [stats, setStats] = useState<MonitoringStats>({ totalToday: 0, totalAll: 0, onlineCount: 0, vehicleCount: 0 });
+  const [stats, setStats] = useState<MonitoringStats>({ totalToday: 0, totalAll: 0, vehicleCount: 0 });
   const [filterOptions, setFilterOptions] = useState<MonitoringFilters>({ departments: [], customers: [], plates: [], projects: [], entities: [] });
   const [total, setTotal] = useState(0);
   const [page, setPage] = useState(1);
@@ -119,7 +119,6 @@ export default function MonitoringView() {
 
   const departments = filterOptions.departments;
   const plateNumbers = filterOptions.plates;
-  const projects = filterOptions.customers;
 
   // 加载首页数据
   const loadFirstPage = useCallback(() => {
@@ -327,14 +326,14 @@ export default function MonitoringView() {
                       <th className="p-4 text-[10px] font-bold text-slate-500 uppercase">在线状态</th>
                       <th className="p-4 text-[10px] font-bold text-slate-500 uppercase">
                         <div className="flex flex-col gap-1.5">
-                          <span>客户项目</span>
+                          <span>客户</span>
                           <select
                             className="bg-slate-800 border-none rounded-lg px-2 py-1 text-[9px] text-slate-300 outline-none focus:ring-1 focus:ring-blue-500/30"
-                            value={filterProject}
-                            onChange={(e) => setFilterProject(e.target.value)}
+                            value={filterCustomer}
+                            onChange={(e) => setFilterCustomer(e.target.value)}
                           >
                             <option value="All">全部客户</option>
-                            {projects.map(p => <option key={p} value={p}>{p}</option>)}
+                            {filterOptions.customers.map(p => <option key={p} value={p}>{p}</option>)}
                           </select>
                         </div>
                       </th>