Fix ChatGPT subscription model requests

[ComputelessComputer]

Load models from the Codex catalog and adapt generate calls to its stream-only Responses endpoint.

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Note

Medium Risk
Changes subscription ChatGPT request and model-selection paths; mistakes could break OAuth ChatGPT chat or show wrong models, but scope is limited to that provider and includes tests.

Overview
Fixes ChatGPT subscription integration by aligning model discovery with the Codex catalog and routing non-streaming generate paths through the Responses API’s stream-only behavior.

Model listing now calls the Codex models endpoint with a fixed client_version, parses slug / visibility instead of the old OpenAI-style data.id shape, drops hidden models, and clears the hardcoded ChatGPT fallback list so failed discovery returns an empty list instead of stale model IDs.

Generation adds streamOnlyGenerationMiddleware, applied only for OAuth ChatGPT in useLLMConnection: doGenerate is implemented by consuming doStream and assembling text, reasoning, tool calls, usage, and errors into a single result. Unit tests cover stream aggregation and catalog parsing.

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