feat: 实现客户端换货系统（client-exchange-system）

新增完整换货生命周期管理：后台发起 → 客户端填收货信息 → 后台发货 → 确认完成（含可选全量迁移） → 旧资产转新再销售

后台接口（7个）：
- POST /api/admin/exchanges（发起换货）
- GET /api/admin/exchanges（换货列表）
- GET /api/admin/exchanges/:id（换货详情）
- POST /api/admin/exchanges/:id/ship（发货）
- POST /api/admin/exchanges/:id/complete（确认完成+可选迁移）
- POST /api/admin/exchanges/:id/cancel（取消）
- POST /api/admin/exchanges/:id/renew（旧资产转新）

客户端接口（2个）：
- GET /api/c/v1/exchange/pending（查询换货通知）
- POST /api/c/v1/exchange/:id/shipping-info（填写收货信息）

核心能力：
- ExchangeOrder 模型与状态机（1待填写→2待发货→3已发货→4已完成，1/2可取消→5）
- 全量迁移事务（11张表：钱包、套餐、标签、客户绑定等）
- 旧资产转新（generation+1、状态重置、新钱包、历史隔离）
- 旧 CardReplacementRecord 表改名为 legacy，is_replaced 过滤改为查新表
- 数据库迁移：000085 新建 tb_exchange_order，000086 旧表改名

internal/bootstrap/services.go

@@ -20,6 +20,7 @@ import (
 	enterpriseSvc "github.com/break/junhong_cmp_fiber/internal/service/enterprise"
 	enterpriseCardSvc "github.com/break/junhong_cmp_fiber/internal/service/enterprise_card"
 	enterpriseDeviceSvc "github.com/break/junhong_cmp_fiber/internal/service/enterprise_device"
+	exchangeSvc "github.com/break/junhong_cmp_fiber/internal/service/exchange"
 	iotCardSvc "github.com/break/junhong_cmp_fiber/internal/service/iot_card"
 	iotCardImportSvc "github.com/break/junhong_cmp_fiber/internal/service/iot_card_import"
 	myCommissionSvc "github.com/break/junhong_cmp_fiber/internal/service/my_commission"
@@ -76,6 +77,7 @@ type services struct {
 	CommissionStats             *commissionStatsSvc.Service
 	PurchaseValidation          *purchaseValidationSvc.Service
 	Order                       *orderSvc.Service
+	Exchange                    *exchangeSvc.Service
 	Recharge                    *rechargeSvc.Service
 	PollingConfig               *pollingSvc.ConfigService
 	PollingConcurrency          *pollingSvc.ConcurrencyService
@@ -167,6 +169,7 @@ func initServices(s *stores, deps *Dependencies) *services {
 		CommissionStats:            commissionStatsSvc.New(s.ShopSeriesCommissionStats),
 		PurchaseValidation:         purchaseValidation,
 		Order:                      orderSvc.New(deps.DB, deps.Redis, s.Order, s.OrderItem, s.AgentWallet, s.AssetWallet, purchaseValidation, s.ShopPackageAllocation, s.ShopSeriesAllocation, s.IotCard, s.Device, s.PackageSeries, s.PackageUsage, s.Package, wechatConfig, deps.WechatPayment, deps.QueueClient, deps.Logger),
+		Exchange:                   exchangeSvc.New(deps.DB, s.ExchangeOrder, s.IotCard, s.Device, s.AssetWallet, s.AssetWalletTransaction, s.PackageUsage, s.PackageUsageDailyRecord, s.ResourceTag, s.PersonalCustomerDevice, deps.Logger),
 		Recharge:                   rechargeSvc.New(deps.DB, s.AssetRecharge, s.AssetWallet, s.AssetWalletTransaction, s.IotCard, s.Device, s.ShopSeriesAllocation, s.PackageSeries, s.CommissionRecord, wechatConfig, deps.Logger),
 		PollingConfig:              pollingSvc.NewConfigService(s.PollingConfig),
 		PollingConcurrency:         pollingSvc.NewConcurrencyService(s.PollingConcurrencyConfig, deps.Redis),