chore: move the go code into a subfolder

apps/api/internal/domain/target.go

@@ -0,0 +1,26 @@
+package domain
+
+type TargetType uint
+
+const (
+	TargetTypeWebhook TargetType = iota
+	TargetTypeCall
+	TargetTypeAsync
+)
+
+type TargetState int32
+
+const (
+	TargetUnspecified TargetState = iota
+	TargetActive
+	TargetRemoved
+	targetStateCount
+)
+
+func (s TargetState) Valid() bool {
+	return s >= 0 && s < targetStateCount
+}
+
+func (s TargetState) Exists() bool {
+	return s != TargetUnspecified && s != TargetRemoved
+}