feat: 添加设备IMEI和单卡ICCID查询接口

- 新增 GET /api/admin/devices/by-imei/:imei 接口，支持通过设备号查询设备详情
- 新增 GET /api/admin/iot-cards/by-iccid/:iccid 接口，支持通过ICCID查询单卡详情
- 添加对应的 Service 层方法和 Handler
- 更新 OpenAPI 文档
- 添加集成测试并修复测试环境配置（使用环境变量）
- 归档已完成的 OpenSpec 变更记录

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

internal/service/device/service.go

@@ -134,6 +134,25 @@ func (s *Service) Get(ctx context.Context, id uint) (*dto.DeviceResponse, error)
 	return s.toDeviceResponse(device, shopMap, bindingCounts), nil
 }
 
+// GetByDeviceNo 通过设备号获取设备详情
+func (s *Service) GetByDeviceNo(ctx context.Context, deviceNo string) (*dto.DeviceResponse, error) {
+	device, err := s.deviceStore.GetByDeviceNo(ctx, deviceNo)
+	if err != nil {
+		if err == gorm.ErrRecordNotFound {
+			return nil, errors.New(errors.CodeNotFound, "设备不存在")
+		}
+		return nil, err
+	}
+
+	shopMap := s.loadShopData(ctx, []*model.Device{device})
+	bindingCounts, err := s.getBindingCounts(ctx, []uint{device.ID})
+	if err != nil {
+		return nil, err
+	}
+
+	return s.toDeviceResponse(device, shopMap, bindingCounts), nil
+}
+
 func (s *Service) Delete(ctx context.Context, id uint) error {
 	device, err := s.deviceStore.GetByID(ctx, id)
 	if err != nil {

internal/service/iot_card/service.go

@@ -110,6 +110,24 @@ func (s *Service) ListStandalone(ctx context.Context, req *dto.ListStandaloneIot
 	}, nil
 }
 
+// GetByICCID 通过 ICCID 获取单卡详情
+func (s *Service) GetByICCID(ctx context.Context, iccid string) (*dto.IotCardDetailResponse, error) {
+	card, err := s.iotCardStore.GetByICCID(ctx, iccid)
+	if err != nil {
+		if err == gorm.ErrRecordNotFound {
+			return nil, errors.New(errors.CodeNotFound, "IoT卡不存在")
+		}
+		return nil, err
+	}
+
+	carrierMap, shopMap := s.loadRelatedData(ctx, []*model.IotCard{card})
+	standaloneResp := s.toStandaloneResponse(card, carrierMap, shopMap)
+
+	return &dto.IotCardDetailResponse{
+		StandaloneIotCardResponse: *standaloneResp,
+	}, nil
+}
+
 func (s *Service) loadRelatedData(ctx context.Context, cards []*model.IotCard) (map[uint]string, map[uint]string) {
 	carrierIDs := make([]uint, 0)
 	shopIDs := make([]uint, 0)