BOSTON — Defending itself in a lawsuit alleging bias against Asian-Americans, Harvard University is fighting a push to make public a trove of admissions documents including internal communications, statistics on accepted students and a “dean’s interest list.” The fight over alleged discrimination already has led to disclosures including Harvard’s practice of scoring applicants on personal traits like “courage” and “likeability.” As the case moves toward trial, the records tussle could pull the curtain back even further on the secretive, complex process that decides who gets a place and who doesn’t at one of the world’s most selective institutions. The Ivy League university has told the court that releasing the files would be an unprecedented breach of its inner workings.