refactor: split backend transport and domain modules

internal/server/router/email.go

@@ -0,0 +1,13 @@
+package router
+
+import (
+	"kra/internal/server/handler"
+
+	"github.com/gin-gonic/gin"
+)
+
+func RegisterEmail(group *gin.RouterGroup, h *handler.Email) {
+	email := group.Group("/email")
+	email.POST("/emailTest", h.Test)
+	email.POST("/sendEmail", h.Send)
+}