feat: 新增数据库迁移，重命名 device_no 为 virtual_no，新增 iot_card.virtual_no 和 package.virtual_ratio 字段

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

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

internal/model/personal_customer_device.go

@@ -11,7 +11,7 @@ import (
 type PersonalCustomerDevice struct {
 	gorm.Model
 	CustomerID uint      `gorm:"column:customer_id;type:bigint;not null;comment:关联个人客户ID" json:"customer_id"`
-	DeviceNo   string    `gorm:"column:device_no;type:varchar(50);not null;comment:设备号/IMEI" json:"device_no"`
+	VirtualNo  string    `gorm:"column:virtual_no;type:varchar(50);not null;comment:设备虚拟号/IMEI" json:"virtual_no"`
 	BindAt     time.Time `gorm:"column:bind_at;type:timestamp;not null;comment:绑定时间" json:"bind_at"`
 	LastUsedAt time.Time `gorm:"column:last_used_at;type:timestamp;comment:最后使用时间" json:"last_used_at"`
 	Status     int       `gorm:"column:status;type:int;not null;default:1;comment:状态 0=禁用 1=启用" json:"status"`