- Add OpenAI as new API provider with support for gpt-5.4, gpt-5.3-codex, gpt-5.4-mini models
- Extend model configuration system to include OpenAI provider
- Add isCodexSubscriber function for OpenAI authentication detection
- Update model options and descriptions for Codex models
- Create codex-fetch-adapter for OpenAI API integration
- Add OpenAI OAuth configuration and authentication URLs
- Update default model selection logic for Codex users
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Co-Authored-By: Claude <noreply@anthropic.com>