openai/gpt-chat-latest → A (4:1)

Side A fixes concrete regressions in the OAuth test infrastructure: it corrects query parsing (`str/split` regex), reads POST bodies from `getRequestBody`, avoids null handling crashes (`parse-token-user`, `state` encoding), fixes redirect response handling, wraps handlers with error reporting, and updates Playwright helpers to use real selectors. Side B is primarily a structural refactor that removes a duplicate `forum.rs` and reorganizes code into modules without materially changing behavior, improving maintainability but adding little new functionality.