chore: move the go code into a subfolder

apps/api/internal/domain/project_grant_member.go

@@ -0,0 +1,17 @@
+package domain
+
+import (
+	es_models "github.com/zitadel/zitadel/internal/eventstore/v1/models"
+)
+
+type ProjectGrantMember struct {
+	es_models.ObjectRoot
+
+	GrantID string
+	UserID  string
+	Roles   []string
+}
+
+func (i *ProjectGrantMember) IsValid() bool {
+	return i.AggregateID != "" && i.GrantID != "" && i.UserID != "" && len(i.Roles) != 0
+}