fix(api): 修正看板和历史统计口径

src/server/api/routers/battery.router.ts

@@ -1,4 +1,4 @@
-import { createBatteriesResponse, createDashboardSnapshot } from '@/domain/battery'
+import { createBatteriesResponse, createDashboardSnapshot, POWER_STATUS } from '@/domain/battery'
 import { os } from '@/server/api/server'
 import {
   getBatteryHistory,
@@ -63,5 +63,10 @@ export const batteries = os.battery.batteries.handler(async ({ input }) => {
 export const history = os.battery.history.handler(async ({ input }) => {
   const items = await getBatteryHistory(input.mac)
 
-  return createBatteriesResponse(items)
+  // History returns a limited window, so the counters must describe only this returned slice.
+  return createBatteriesResponse(items, new Date(), {
+    total: items.length,
+    lowPower: items.filter((item) => item.isLowPower).length,
+    charging: items.filter((item) => item.powerStatus === POWER_STATUS.CHARGING).length,
+  })
 })