feat: complete registration invitation and auth redesign

server/validate/validator.go

@@ -58,6 +58,12 @@ type Validator interface {
 	TempAuthScheme() (string, error)
 }
 
+// CodeSender is an optional synchronous delivery capability used by product
+// verification challenges which exist before a user account is created.
+type CodeSender interface {
+	SendCode(tenantID t.TenantID, recipient, lang, scene, code string) error
+}
+
 func ValidateHostURL(origUrl string) (string, error) {
 	hostUrl, err := url.Parse(origUrl)
 	if err != nil {