feat: add SESSION_IDLE_TIMEOUT config

- New env var SESSION_IDLE_TIMEOUT (default 24h)
- Parsed as time.Duration in handlers

internal/config/config.go

@@ -36,6 +36,7 @@ type Config struct {
 	MOTD               string
 	ServerName         string
 	FederationKey      string
+	SessionIdleTimeout string
 	params             *Params
 	log                *slog.Logger
 }
@@ -66,6 +67,7 @@ func New(
 	viper.SetDefault("MOTD", "")
 	viper.SetDefault("SERVER_NAME", "")
 	viper.SetDefault("FEDERATION_KEY", "")
+	viper.SetDefault("SESSION_IDLE_TIMEOUT", "24h")
 
 	err := viper.ReadInConfig()
 	if err != nil {
@@ -90,6 +92,7 @@ func New(
 		MOTD:               viper.GetString("MOTD"),
 		ServerName:         viper.GetString("SERVER_NAME"),
 		FederationKey:      viper.GetString("FEDERATION_KEY"),
+		SessionIdleTimeout: viper.GetString("SESSION_IDLE_TIMEOUT"),
 		log:                log,
 		params:             &params,
 	}