fix: add default database for pg bouncer support (#545)

Author: Yeuoly

internal/types/app/default.go

@@ -38,7 +38,7 @@ func (config *Config) SetDefault() {
 	setDefaultInt(&config.PythonEnvInitTimeout, 120)
 	setDefaultInt(&config.DifyInvocationWriteTimeout, 5000)
 	setDefaultInt(&config.DifyInvocationReadTimeout, 240000)
-	if config.DBType == DB_TYPE_POSTGRESQL {
+	if config.DBType == DB_TYPE_POSTGRESQL || config.DBType == DB_TYPE_PG_BOUNCER {
 		setDefaultString(&config.DBDefaultDatabase, "postgres")
 	} else if config.DBType == DB_TYPE_MYSQL {
 		setDefaultString(&config.DBDefaultDatabase, "mysql")