sloproxy

feat(server): add support for Codex Alpha Search model routing master

- Implemented `codexAlphaSearchSelectionModel` and `codexAlphaSearchModelRouterHost` for dynamic model selection using plugin-based routing. - Introduced new `codex-alpha-search` source format for model route requests. - Integrated routing logic into the model selection pipeline to handle Codex Alpha Search requests with fallback mechanisms.


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