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/history.go

@@ -20,10 +20,12 @@ type record struct {
 }
 
 type dailyStat struct {
-	Date    string   `json:"date"`
-	Surplus float64  `json:"surplus"`
-	Amount  float64  `json:"amount"`
-	Usage   *float64 `json:"usage"` // nil 表示无前一天基线
+	Date     string   `json:"date"`
+	Surplus  float64  `json:"surplus"`
+	Amount   float64  `json:"amount"`
+	Usage    *float64 `json:"usage"`     // nil 表示无前一天基线
+	Recharge *float64 `json:"recharge"`  // 当天充值电量(度), nil=无充值
+	Money    *float64 `json:"money"`     // 当天充值金额(元), nil=无充值
 }
 
 // monthSummary 月度汇总
@@ -34,7 +36,9 @@ type monthSummary struct {
 	EndSurplus   *float64 `json:"end_surplus"`    // 月末末次电量
 	TotalUsage   *float64 `json:"total_usage"`    // 月总耗电
 	AvgUsage     *float64 `json:"avg_usage"`      // 日均耗电
-	RechargeDays int      `json:"recharge_days"`  // 疑似充值天数（电量回升）
+	RechargeDays int      `json:"recharge_days"`  // 充值天数
+	RechargeKwh  *float64 `json:"recharge_kwh"`   // 月充值电量(度)
+	RechargeMoney *float64 `json:"recharge_money"` // 月充值金额(元)
 	MaxUsage     *float64 `json:"max_usage"`      // 单日最大耗电
 }
 
@@ -113,9 +117,10 @@ func getRecords() []record {
 	return records
 }
 
-// buildDailyStats 按日期升序生成每日统计（含日耗电 = 前一天剩余 - 当天剩余）
+// buildDailyStats 按日期升序生成每日统计（含日耗电 = 前一天剩余 - 当天剩余 + 当天充值电量）
 // 注意: 耗电计算跨月时使用上月末记录作为基线（若存在）
-func buildDailyStats(records []record, month string) []dailyStat {
+// rechargeMap: date -> 当天充值电量(度)；精确修正充值当天的耗电
+func buildDailyStats(records []record, month string, rechargeMap map[string]float64) []dailyStat {
 	all := loadHistory()
 	// 若指定月份，额外包含上一月最后一条记录作为基线（不计入本月输出）
 	var prevMonthLast *record
@@ -151,13 +156,23 @@ func buildDailyStats(records []record, month string) []dailyStat {
 	for _, r := range target {
 		var usage *float64
 		if prevSurplus != nil {
-			u := round2(*prevSurplus - r.Surplus)
+			// 精确耗电 = 剩余变化 + 当天充值电量
+			u := round2(*prevSurplus - r.Surplus + rechargeMap[r.Date])
 			if u < 0 {
-				u = 0 // 充值/异常归零
+				u = 0 // 极端异常(数据缺口)归零
 			}
 			usage = &u
 		}
-		daily = append(daily, dailyStat{Date: r.Date, Surplus: r.Surplus, Amount: r.Amount, Usage: usage})
+		var recharge, money *float64
+		if kwh, ok := rechargeMap[r.Date]; ok && kwh > 0 {
+			recharge = &kwh
+			m := round2(kwh * unitPrice())
+			money = &m
+		}
+		daily = append(daily, dailyStat{
+			Date: r.Date, Surplus: r.Surplus, Amount: r.Amount,
+			Usage: usage, Recharge: recharge, Money: money,
+		})
 		s := r.Surplus
 		prevSurplus = &s
 	}
@@ -203,6 +218,8 @@ func buildMonthSummary(daily []dailyStat, month string) *monthSummary {
 
 	var total float64
 	var max float64
+	var totalRechargeKwh float64
+	var totalRechargeMoney float64
 	rechargeDays := 0
 	countWithUsage := 0
 	for _, d := range daily {
@@ -213,14 +230,16 @@ func buildMonthSummary(daily []dailyStat, month string) *monthSummary {
 			}
 			countWithUsage++
 		}
-		// 疑似充值：当天剩余比前一天高
-	}
-	// 充值与最大耗电基于原始升序记录重新精确计算
-	if len(daily) >= 2 {
-		rechargeDays = countRecharges(daily)
+		if d.Recharge != nil {
+			totalRechargeKwh += *d.Recharge
+			rechargeDays++
+		}
+		if d.Money != nil {
+			totalRechargeMoney += *d.Money
+		}
 	}
 
-	var totalP, avgP, maxP, startP, endP *float64
+	var totalP, avgP, maxP, startP, endP, rkwhP, rmoneyP *float64
 	startP, endP = &start, &end
 	totalP = &total
 	if countWithUsage > 0 {
@@ -228,26 +247,25 @@ func buildMonthSummary(daily []dailyStat, month string) *monthSummary {
 		avgP = &avg
 	}
 	maxP = &max
+	if totalRechargeKwh > 0 {
+		rkwhP = &totalRechargeKwh
+	}
+	if totalRechargeMoney > 0 {
+		rmoneyP = &totalRechargeMoney
+	}
 
 	return &monthSummary{
-		Month:        m,
-		RecordCount:  len(daily),
-		StartSurplus: startP,
-		EndSurplus:   endP,
-		TotalUsage:   totalP,
-		AvgUsage:     avgP,
-		RechargeDays: rechargeDays,
-		MaxUsage:     maxP,
+		Month:         m,
+		RecordCount:   len(daily),
+		StartSurplus:  startP,
+		EndSurplus:    endP,
+		TotalUsage:    totalP,
+		AvgUsage:      avgP,
+		RechargeDays:  rechargeDays,
+		RechargeKwh:   rkwhP,
+		RechargeMoney: rmoneyP,
+		MaxUsage:      maxP,
 	}
 }
 
-// countRecharges 统计疑似充值天数（当天剩余较前一天回升）
-func countRecharges(daily []dailyStat) int {
-	n := 0
-	for i := 1; i < len(daily); i++ {
-		if daily[i].Surplus > daily[i-1].Surplus {
-			n++
-		}
-	}
-	return n
-}
+