Fix: various bug fix

types/types.go

@@ -2,4 +2,19 @@ package types
 
 type ShutdownFunc func()
 
+type RunFunc func() error
+
+type StageType int
+
+const (
+	StageLanding StageType = iota
+	StageLobby
+	StageGaming
+)
+
+type Program struct {
+	Run   RunFunc
+	Stage StageType
+}
+
 type UsernameType = string