新增任务管理与报警管理前端，并接入车队健康数据。

运营菜单下挂地图监控/任务/报警入口，车辆卡片与任务列表同步展示运行态。

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

frontends/apps/simple-platform-vue/src/composables/useVehicleCardState.ts

@@ -74,15 +74,17 @@ export function useVehicleCardState(opts: VehicleCardStateOptions) {
 
   const latencyLabel = computed(() => {
     const ms = vehicle.value.latencyMs
+    if (vehicle.value.reachable === false && ms == null) return '不可达'
     if (ms == null) return '—'
-    if (vehicle.value.reachable === false) return '超时'
     return `${ms} ms`
   })
 
   const latencyClass = computed(() => {
     const ms = vehicle.value.latencyMs
     if (vehicle.value.reachable === false) return 'val-danger'
-    if (ms != null && ms > 80) return 'val-warn'
+    // WatchDog TCP RTT：局域网正常多在几十毫秒；>150 警示，>400 危险
+    if (ms != null && ms > 400) return 'val-danger'
+    if (ms != null && ms > 150) return 'val-warn'
     return ''
   })