feat: add ExternalType to customer identity model and update related services and enums

internal/models/models.go

@@ -188,6 +188,7 @@ type Customer struct {
 type CustomerIdentity struct {
 	ID             int64                `gorm:"primaryKey;autoIncrement"`
 	CustomerID     int64                `gorm:"type:bigint;not null;uniqueIndex:uk_customer_external"`                    // 为所属客户ID。
+	ExternalType   enums.ExternalType   `gorm:"type:varchar(30);not null;default:'guest';index"`                          // ExternalType 为外部身份类型：guest访客，user主动设置的用户信息。
 	ExternalSource enums.ExternalSource `gorm:"type:varchar(30);uniqueIndex:uk_customer_external"`                        // 为外部身份来源
 	ExternalID     string               `gorm:"type:varchar(128);index:idx_external_id;uniqueIndex:uk_customer_external"` // 为平台侧用户唯一ID，与访客 ExternalID 对齐。
 	RawProfile     string               `gorm:"type:text"`                                                                // 为第三方原始资料JSON。

internal/pkg/enums/customer.go

@@ -6,6 +6,26 @@ func GetCustomerSourceTypeLabel(sourceType ExternalSource) string {
 	return GetExternalSourceLabel(ExternalSource(sourceType))
 }
 
+// ExternalType 客户外部身份类型。
+type ExternalType string
+
+const (
+	ExternalTypeGuest ExternalType = "guest"
+	ExternalTypeUser  ExternalType = "user"
+)
+
+var externalTypeLabelMap = map[ExternalType]string{
+	ExternalTypeGuest: "访客",
+	ExternalTypeUser:  "用户",
+}
+
+func GetExternalTypeLabel(externalType ExternalType) string {
+	if s, ok := externalTypeLabelMap[externalType]; ok {
+		return s
+	}
+	return string(externalType)
+}
+
 // 联系方式类型
 type ContactType string
 

internal/services/conversation_service.go

@@ -744,6 +744,7 @@ func (s *conversationService) LinkConversationCustomer(conversationID, customerI
 			} else {
 				idRow := &models.CustomerIdentity{
 					CustomerID:     customerID,
+					ExternalType:   enums.ExternalTypeGuest,
 					ExternalSource: enums.ExternalSource(extSrc),
 					ExternalID:     extID,
 					Status:         enums.StatusOk,