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Backport #37185 by @Mohit25022005 Fix 500 error when comparing branches across fork repositories ## Problem The compare API returns a 500 Internal Server Error when comparing branches where the head commit exists only in the fork repository. ## Cause The API was using the base repository's GitRepo and repository context when converting commits. This fails when the commit does not exist in the base repository, resulting in a "fatal: bad object" error. ## Solution Use the head repository and HeadGitRepo when available to ensure commits are resolved in the correct repository context. ## Result * Fixes "fatal: bad object" error * Enables proper comparison between base and fork repositories * Prevents 500 Internal Server Error Fixes #37168 Co-authored-by: Mohit Swarnkar <mohitswarnkar13@gmail.com> Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>