CAIRO — President Abdel-Fattah el-Sissi reshuffled his government on Wednesday, naming nine new ministers and creating a new portfolio for business but leaving the key ministries of defense, foreign affairs or interior untouched. Egyptian security forces are meanwhile embroiled in a debilitating fight against Islamic militants in the Sinai Peninsula who are proving to be tenacious while growing deadlier. The reshuffle is the first since September, when el-Sissi named Sherif Ismail prime minister, his second premier since he took office in 2014 after his landslide election victory. Egyptian authorities rarely share with the public the reasons behind sacking government ministers, prompting media speculation and uncertainty.