chore: move the go code into a subfolder

apps/api/internal/domain/custom_text.go

@@ -0,0 +1,32 @@
+package domain
+
+import (
+	"golang.org/x/text/language"
+
+	"github.com/zitadel/zitadel/internal/eventstore/v1/models"
+)
+
+type CustomText struct {
+	models.ObjectRoot
+
+	State    CustomTextState
+	Default  bool
+	Template string
+	Key      string
+	Language language.Tag
+	Text     string
+}
+
+type CustomTextState int32
+
+const (
+	CustomTextStateUnspecified CustomTextState = iota
+	CustomTextStateActive
+	CustomTextStateRemoved
+
+	customTextStateCount
+)
+
+func (m *CustomText) IsValid() bool {
+	return m.Key != "" && m.Language != language.Und && m.Text != ""
+}