feat(vehicle-hub): 新增车辆运维页（健康监控 / 维护操作 / 批量管理）

- 新增 fleetHealth / vehicleOps API、useVehicleHub 组合式与 VehicleHealthCard 卡片
- 新增 /admin/config/vehicle-hub 与 /monitor/vehicle-hub 双端路由及侧栏菜单
- car 类型补充 rawId/onboardUrl/lstatus 及 FleetHealthRow/VehicleCardModel
- 后端 PageCatalog 注册「车辆运维」页，原「车辆维护」更名为「车辆维护策略」

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

frontends/apps/simple-platform-vue/src/layouts/AppShell.vue

@@ -162,7 +162,8 @@ const ADMIN_MENU: MenuItem[] = [
       { path: '/admin/config/system', label: '系统级配置', key: 'admin-config-system' },
       { path: '/admin/config/integrations', label: '外部系统对接', key: 'admin-config-integrations' },
       { path: '/admin/config/routing', label: '路径规划', key: 'admin-config-routing' },
-      { path: '/admin/config/vehicle', label: '车辆维护', key: 'admin-config-vehicle' },
+      { path: '/admin/config/vehicle', label: '车辆维护策略', key: 'admin-config-vehicle' },
+      { path: '/admin/config/vehicle-hub', label: '车辆运维', key: 'admin-vehicle-hub' },
       { path: '/admin/config/charge', label: '充电策略', key: 'admin-config-charge' },
       { path: '/admin/config/task', label: '任务分配', key: 'admin-config-task' },
       { path: '/admin/config/traffic', label: '交通管制', key: 'admin-config-traffic' },
@@ -179,6 +180,7 @@ const ADMIN_MENU: MenuItem[] = [
 
 const MONITOR_MENU: MenuItem[] = [
   { path: '/monitor/dashboard', label: '运营总览', icon: Monitor, key: 'monitor-dashboard' },
+  { path: '/monitor/vehicle-hub', label: '车辆运维', icon: Van, key: 'monitor-vehicle-hub' },
   { path: '/monitor/map', label: '地图监控', icon: MapLocation, key: 'monitor-map' },
   { path: '/monitor/ops', label: '运维操作', icon: Promotion, key: 'monitor-ops' },
   { path: '/monitor/notes', label: '运营备注', icon: Notebook, key: 'monitor-notes' }