feat: 精确耗电计算(接入充值记录接口)

- 新增 queryISIMSRoomBuyRecord 充值记录获取 + 10分钟缓存

- 日耗电 = 剩余变化 + 当天充值电量(电价0.535元/度)

- 月度汇总增加充值次数/电量/金额

Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent)

Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

go/main.go

@@ -100,21 +100,35 @@ func apiHistory(w http.ResponseWriter, r *http.Request) {
 	month := q.Get("month") // YYYY-MM，空=全部
 
 	records := getRecords()
-	allDaily := buildDailyStats(records, "") // 全量（用于可用月份列表）
-	monthDaily := buildDailyStats(records, month)
+
+	// 获取充值记录（用于精确耗电计算）
+	rechargeMap := map[string]float64{}
+	var buyRecords []buyRecord
+	if c, err := loadCache(); err == nil {
+		if recs, err := getBuyRecordsCached(c.AppShiro, &c.Room); err == nil {
+			rechargeMap = rechargeKwhByDate(recs)
+			buyRecords = recs
+		} else {
+			fmt.Println("[充值] 获取充值记录失败:", err)
+		}
+	}
+
+	allDaily := buildDailyStats(records, "", rechargeMap)   // 全量（用于可用月份列表）
+	monthDaily := buildDailyStats(records, month, rechargeMap)
 
 	// 可用月份列表（降序）
 	months := availableMonths(records)
 
 	summary := buildMonthSummary(monthDaily, month)
 	writeJSON(w, map[string]any{
-		"ok":        true,
-		"month":     month,
-		"months":    months,
-		"records":   monthDaily, // 升序每日统计（含 usage）
-		"daily":     monthDaily,
-		"summary":   summary,
-		"all_count": len(allDaily),
+		"ok":         true,
+		"month":      month,
+		"months":     months,
+		"records":    monthDaily, // 升序每日统计（含 usage）
+		"daily":      monthDaily,
+		"summary":    summary,
+		"recharges":  buyRecords, // 充值记录明细
+		"all_count":  len(allDaily),
 	})
 }