WASHINGTON — Congress overwhelmingly passed emergency legislation Thursday that would bolster security at the Capitol, repay outstanding debts from the violent Jan. 6 insurrection and increase the number of visas for allies who worked alongside Americans in the Afghanistan war. The $2.1 billion bill now goes to President Joe Biden for his signature. The Senate approved the legislation early Thursday afternoon, 98-0, and the House passed it immediately afterward, 416-11. Senators struck a bipartisan agreement on the legislation this week, two months after the House had passed a bill that would have provided around twice as much for Capitol security. But House leaders said they would back the Senate version anyway, arguing the money is urgently needed for the Capitol Police and for the translators and others who worked closely with U.S. government troops and civilians in Afghanistan.