sloproxy

feat(compat): preserve Claude thinking/tool-call content for is-compat OpenAI compatibility models master

- Add `is-compat` support to OpenAI compatibility model config, capabilities, hashing, and example config. - Propagate `IsCompat` through API-key model resolution and switch OpenAI-compat executor translation to compatibility-aware routing. - Keep Claude assistant thinking content in compatibility mode while keeping default behavior unchanged when `is-compat` is disabled. Closes: #4776