refactor: 流量系统重构 — 增量累加算法 + 日粒度缓冲 + 旧详单清理

核心改造：
- 增量算法：流量计算从覆盖式改为增量累加（gateway - lastReading），支持上游运营商重置检测
- 日流量缓冲：insertDataUsageRecord 改为 Redis INCRBYFLOAT，每日凌晨落盘到 tb_card_daily_usage
- 运营商：新增 data_reset_day 字段（联通=27，其余=1）
- IoT卡：新增 last_gateway_reading_mb 字段存储上次网关读数
- 查询层：新建 TrafficQueryService 合并 Redis（今日）+ DB（历史）数据源
- 清理：删除 DataUsageRecord model/store，移除 polling_handler 旧引用

迁移：000094-000097（carrier字段、iot_card字段、数据初始化、日流量表）

internal/bootstrap/services.go

@@ -41,6 +41,7 @@ import (
 	shopPackageBatchAllocationSvc "github.com/break/junhong_cmp_fiber/internal/service/shop_package_batch_allocation"
 	shopPackageBatchPricingSvc "github.com/break/junhong_cmp_fiber/internal/service/shop_package_batch_pricing"
 	shopSeriesGrantSvc "github.com/break/junhong_cmp_fiber/internal/service/shop_series_grant"
+	trafficSvc "github.com/break/junhong_cmp_fiber/internal/service/traffic"
 	wechatConfigSvc "github.com/break/junhong_cmp_fiber/internal/service/wechat_config"
 )
 
@@ -94,6 +95,7 @@ type services struct {
 	AgentRecharge               *agentRechargeSvc.Service
 	PackageActivation           *packageSvc.ActivationService
 	Refund                      *refundSvc.Service
+	TrafficQuery                *trafficSvc.QueryService
 }
 
 func initServices(s *stores, deps *Dependencies) *services {
@@ -210,6 +212,7 @@ func initServices(s *stores, deps *Dependencies) *services {
 			deps.Logger,
 		),
 		PackageActivation: packageActivation,
+		TrafficQuery:      trafficSvc.NewQueryService(deps.Redis, s.CardDailyUsage),
 		Refund: refundSvc.New(
 			deps.DB,
 			s.RefundRequest,

internal/bootstrap/stores.go

@@ -61,6 +61,8 @@ type stores struct {
 	WechatConfig *postgres.WechatConfigStore
 	// 退款系统
 	RefundRequest *postgres.RefundStore
+	// 流量系统
+	CardDailyUsage *postgres.CardDailyUsageStore
 }
 
 func initStores(deps *Dependencies) *stores {
@@ -119,5 +121,6 @@ func initStores(deps *Dependencies) *stores {
 		AssetRecharge:          postgres.NewAssetRechargeStore(deps.DB, deps.Redis),
 		WechatConfig:           postgres.NewWechatConfigStore(deps.DB, deps.Redis),
 		RefundRequest:          postgres.NewRefundStore(deps.DB),
+		CardDailyUsage:         postgres.NewCardDailyUsageStore(deps.DB),
 	}
 }