chore: move the go code into a subfolder

apps/api/internal/domain/application_oauth.go

@@ -0,0 +1,34 @@
+package domain
+
+import (
+	"github.com/zitadel/zitadel/internal/id"
+)
+
+type oAuthApplication interface {
+	setClientID(clientID string)
+	setClientSecret(encodedHash string)
+	requiresClientSecret() bool
+}
+
+// ClientID random_number (eg. 495894098234)
+func SetNewClientID(a oAuthApplication, idGenerator id.Generator) error {
+	clientID, err := idGenerator.Next()
+	if err != nil {
+		return err
+	}
+
+	a.setClientID(clientID)
+	return nil
+}
+
+func SetNewClientSecretIfNeeded(a oAuthApplication, generate func() (encodedHash, plain string, err error)) (string, error) {
+	if !a.requiresClientSecret() {
+		return "", nil
+	}
+	encodedHash, plain, err := generate()
+	if err != nil {
+		return "", err
+	}
+	a.setClientSecret(encodedHash)
+	return plain, nil
+}