~anthropic/claude-sonnet-latest → B (60:40)

Side B fixes a real runtime NameError bug (missing GITHUB_API_BASE_URL definition) with a small, correct, targeted change. Side A is a large mechanical refactor (splitting forum.rs into modules) which is legitimate cleanup but is essentially reorganization/churn rather than fixing a functional defect, and its value depends on the split being correctly wired (harder to verify from diff alone).