async _getAvailableMemory() {
        const totalMemory = os.totalmem();
        const freeMemory = os.freemem();
        const totalMemoryMB = (totalMemory / (1024 * 1024)).toFixed(0);
        const freeMemoryMB = (freeMemory / (1024 * 1024)).toFixed(0);
        return { totalMemoryMB, freeMemoryMB };
    }
Get available system memory
@returns {Object} Object with totalMemoryMB and freeMemoryMB