feat(auth): add logout functionality

- Implement LogoutHandler to handle user logout requests
- Add DeleteTokenInfo and GetUserIDFromToken functions to auth module
- Update README.md with logout endpoint documentation

router.go

@@ -10,6 +10,7 @@ func setupRoutes() {
 	postLog.Info("Setting up routes...")
 	http.HandleFunc("/register", RegisterHandler)
 	http.HandleFunc("/login", LoginHandler)
+	http.HandleFunc("/logout", LogoutHandler)
 
 	http.HandleFunc("/frpcAct/instanceMgr/create", CreateInstanceHandler)
 	http.HandleFunc("/frpcAct/instanceMgr/list", ListInstancesHandler)