feat(shipment): 添加混装功能模块

- 在 shipment 结构体中新增 Mixed 类型字段
- 创建 mixed 包及其相关结构体定义
- 实现混装列表查询、生成等功能接口
- 添加混装箱体和产品的数据模型及操作方法
- 集成客户端调用逻辑并实现 RPC 接口
- 定义混装相关的参数结构体和返回值类型

erp/shipment/mixed.go

@@ -0,0 +1,59 @@
+package shipment
+
+import (
+	"context"
+	"time"
+
+	"git.kumo.work/shama/service/client"
+	mixed2 "git.kumo.work/shama/service/erp/shipment/mixed"
+	"git.kumo.work/shama/service/lib/bean"
+)
+
+type mixed struct {
+	Mixed mixed2.Mixed
+}
+
+type ArgsMixedList struct {
+	Page   bean.Page
+	Search MixedSearch
+}
+type MixedSearch struct {
+	InvoiceSerial   string  // 出运发票号
+	CreatedStaffIds []int64 // 业务员筛选
+}
+type ReplyMixedList struct {
+	List  []MixedItem `json:"list"`
+	Total int64       `json:"total"`
+}
+type MixedItem struct {
+	Id             int64      `json:"id"`
+	ShipmentId     int64      `json:"shipmentId"`
+	InvoiceSerial  string     `json:"invoiceSerial"`
+	CreatedStaffId int64      `json:"createdStaffId"`
+	CreatedAt      *time.Time `json:"createdAt"`
+}
+
+// List @TITLE 列表
+func (m *mixed) List(ctx context.Context, args ArgsMixedList) (reply ReplyMixedList, err error) {
+	xClient, err := client.GetClient(m)
+	if err != nil {
+		return
+	}
+	err = xClient.Call(ctx, "List", args, &reply)
+	return
+}
+
+type ArgsMixedGen struct {
+	ShipmentId int64 // 订舱单id
+	StaffId    int64 // 业务员id
+}
+
+// Gen @TITLE 生成
+func (m *mixed) Gen(ctx context.Context, args ArgsMixedGen) error {
+	xClient, err := client.GetClient(m)
+	if err != nil {
+		return err
+	}
+	reply := 0
+	return xClient.Call(ctx, "Gen", args, &reply)
+}