feat: 实现订单支付功能模块

- 新增订单管理、支付回调、购买验证等核心服务
- 实现订单、订单项目的数据存储层和 API 接口
- 添加订单数据库迁移和 DTO 定义
- 更新 API 文档和路由配置
- 同步 3 个新规范到主规范库（订单管理、订单支付、套餐购买验证）
- 完成 OpenSpec 变更归档

Ultraworked with Sisyphus

internal/model/dto/order_dto.go

@@ -0,0 +1,74 @@
+package dto
+
+import "time"
+
+type CreateOrderRequest struct {
+	OrderType  string `json:"order_type" validate:"required,oneof=single_card device" required:"true" description:"订单类型 (single_card:单卡购买, device:设备购买)"`
+	IotCardID  *uint  `json:"iot_card_id" validate:"required_if=OrderType single_card" description:"IoT卡ID(单卡购买时必填)"`
+	DeviceID   *uint  `json:"device_id" validate:"required_if=OrderType device" description:"设备ID(设备购买时必填)"`
+	PackageIDs []uint `json:"package_ids" validate:"required,min=1,max=10,dive,min=1" required:"true" minItems:"1" maxItems:"10" description:"套餐ID列表"`
+}
+
+type OrderListRequest struct {
+	Page          int        `json:"page" query:"page" validate:"omitempty,min=1" minimum:"1" description:"页码"`
+	PageSize      int        `json:"page_size" query:"page_size" validate:"omitempty,min=1,max=100" minimum:"1" maximum:"100" description:"每页数量"`
+	PaymentStatus *int       `json:"payment_status" query:"payment_status" validate:"omitempty,min=1,max=4" minimum:"1" maximum:"4" description:"支付状态 (1:待支付, 2:已支付, 3:已取消, 4:已退款)"`
+	OrderType     string     `json:"order_type" query:"order_type" validate:"omitempty,oneof=single_card device" description:"订单类型 (single_card:单卡购买, device:设备购买)"`
+	OrderNo       string     `json:"order_no" query:"order_no" validate:"omitempty,max=30" maxLength:"30" description:"订单号(精确查询)"`
+	StartTime     *time.Time `json:"start_time" query:"start_time" description:"创建时间起始"`
+	EndTime       *time.Time `json:"end_time" query:"end_time" description:"创建时间结束"`
+}
+
+type PayOrderRequest struct {
+	PaymentMethod string `json:"payment_method" validate:"required,oneof=wallet wechat alipay" required:"true" description:"支付方式 (wallet:钱包支付, wechat:微信支付, alipay:支付宝支付)"`
+}
+
+type OrderItemResponse struct {
+	ID          uint   `json:"id" description:"明细ID"`
+	PackageID   uint   `json:"package_id" description:"套餐ID"`
+	PackageName string `json:"package_name" description:"套餐名称"`
+	Quantity    int    `json:"quantity" description:"数量"`
+	UnitPrice   int64  `json:"unit_price" description:"单价(分)"`
+	Amount      int64  `json:"amount" description:"小计金额(分)"`
+}
+
+type OrderResponse struct {
+	ID                      uint                 `json:"id" description:"订单ID"`
+	OrderNo                 string               `json:"order_no" description:"订单号"`
+	OrderType               string               `json:"order_type" description:"订单类型 (single_card:单卡购买, device:设备购买)"`
+	BuyerType               string               `json:"buyer_type" description:"买家类型 (personal:个人客户, agent:代理商)"`
+	BuyerID                 uint                 `json:"buyer_id" description:"买家ID"`
+	IotCardID               *uint                `json:"iot_card_id,omitempty" description:"IoT卡ID"`
+	DeviceID                *uint                `json:"device_id,omitempty" description:"设备ID"`
+	TotalAmount             int64                `json:"total_amount" description:"订单总金额(分)"`
+	PaymentMethod           string               `json:"payment_method,omitempty" description:"支付方式 (wallet:钱包支付, wechat:微信支付, alipay:支付宝支付)"`
+	PaymentStatus           int                  `json:"payment_status" description:"支付状态 (1:待支付, 2:已支付, 3:已取消, 4:已退款)"`
+	PaymentStatusText       string               `json:"payment_status_text" description:"支付状态文本"`
+	PaidAt                  *time.Time           `json:"paid_at,omitempty" description:"支付时间"`
+	CommissionStatus        int                  `json:"commission_status" description:"佣金状态 (1:待计算, 2:已计算)"`
+	CommissionConfigVersion int                  `json:"commission_config_version" description:"佣金配置版本"`
+	Items                   []*OrderItemResponse `json:"items" description:"订单明细列表"`
+	CreatedAt               time.Time            `json:"created_at" description:"创建时间"`
+	UpdatedAt               time.Time            `json:"updated_at" description:"更新时间"`
+}
+
+type OrderListResponse struct {
+	List       []*OrderResponse `json:"list" description:"订单列表"`
+	Total      int64            `json:"total" description:"总数"`
+	Page       int              `json:"page" description:"当前页码"`
+	PageSize   int              `json:"page_size" description:"每页数量"`
+	TotalPages int              `json:"total_pages" description:"总页数"`
+}
+
+type GetOrderRequest struct {
+	ID uint `path:"id" description:"订单ID" required:"true"`
+}
+
+type CancelOrderRequest struct {
+	ID uint `path:"id" description:"订单ID" required:"true"`
+}
+
+type PayOrderParams struct {
+	ID uint `path:"id" description:"订单ID" required:"true"`
+	PayOrderRequest
+}