UPDATE: Add self update

internal/app-serrvice.go

@@ -0,0 +1,22 @@
+package internal
+
+import (
+	"firefly-launcher/pkg/constant"
+	"time"
+
+	"github.com/wailsapp/wails/v3/pkg/application"
+)
+
+type AppService struct{}
+
+func (a *AppService) GetCurrentLauncherVersion() (bool, string) {
+	return true, constant.CurrentLauncherVersion
+}
+
+func (a *AppService) CloseAppAfterTimeout(timeout int) (bool, string) {
+	go func() {
+		time.Sleep(time.Duration(timeout) * time.Second)
+		application.Get().Quit()
+	}()
+	return true, ""
+}