调整商户注册逻辑

internal/model/merchantAdmin.go

@@ -19,7 +19,9 @@ type MerchantAdminInfoIn struct {
 	MerchantAdminId int64
 }
 type MerchantAdminInfoOut struct {
-	Name string
+	Username   string
+	MerchantId int64
+	StoreId    int64
 }
 type MerchantAdminCodeIn struct {
 	Phone string