openai/gpt-5.2-chat → A (9:1)

Side A removes the 1400+ line monolithic `server/src/html/forum.rs`, introduces `forum/mod.rs`, and splits functionality into focused modules (`feed.rs`, `views.rs`, `profile.rs`, `thread_morph.rs`, etc.), resolving the duplicate module root ambiguity and significantly improving structure and maintainability. Side B is a minor HTML tweak changing a disabled paginator element from `<span>` to `<a href="#">`, which is negligible compared to the architectural cleanup in A.