openai/gpt-chat-latest → B (9:1)

Side B implements a substantive reliability fix in the Reddit client: when OAuth credentials are configured it no longer falls back to blocked public endpoints, retries once after refreshing tokens on 401/403, improves error propagation, and adds a test for error-message truncation. Side A mainly adds deployment documentation and a Fly.io configuration for Open WebUI, which is useful but does not change the project's core runtime behavior in the same lasting way.