feat: 添加 微信物流服务 /微信物流服务（商家查看） /消息组件

[ccfish86]

微信小程序 物流服务 消息组件
物流消息是微信官方为小程序提供的免费物流消息通知接口。

[Copilot]

Pull Request Overview

This PR integrates the WeChat logistics (express) service into the mini-program SDK, providing endpoints for waybill operations and delivery company listing.

• Registers a new GetExpress method on MiniProgram
• Introduces the express package with service constructor
• Implements delivery endpoints, request/response types, and status enums

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
miniprogram/miniprogram.go	Imported express package and added GetExpress method
miniprogram/express/express.go	Defined Express type and NewExpress constructor
miniprogram/express/delivery.go	Added waybill operations (Follow, Query, Update) and company list

Comments suppressed due to low confidence (4)

miniprogram/express/delivery.go:25

• [nitpick] The receiver name express shadows the package name and can be confusing; consider renaming it to e or srv for clarity.

func (express *Express) FollowWaybill(ctx context.Context, in *FollowWaybillRequest) (res FollowWaybillResponse, err error) {

miniprogram/express/delivery.go:21

• [nitpick] For consistency with other URL constants (which include URL suffix), consider renaming this to openMsgGetDeliveryListURL.

	openMsgGetDeliveryList = "https://api.weixin.qq.com/cgi-bin/express/delivery/open_msg/get_delivery_list?access_token=%s"

miniprogram/express/delivery.go:100

• [nitpick] The comment for SenderPhone doesn’t indicate whether it’s required or optional; consider adding 必选 or 可选 to clarify.

	SenderPhone     string                 `json:"sender_phone"`      // 寄件人手机号

miniprogram/express/delivery.go:25

• No unit tests accompany this new endpoint; consider adding tests that mock util.PostJSONContext and verify correct URL formatting and error handling.

func (express *Express) FollowWaybill(ctx context.Context, in *FollowWaybillRequest) (res FollowWaybillResponse, err error) {

[ccfish86]

不好意思刚才测试的时候发现查询结果写错了一点，已提交

[houseme]

建议在描述添加一下相关的官方文档地址，谢谢