Feature/gpt 5 codex

[cuipengfei]

No description provided.

[Copilot]

Pull Request Overview

This PR adds support for GPT-5 Codex by implementing a new Responses API endpoint that enables access to reasoning and tool calling capabilities. The implementation includes translation layers between Anthropic's message format and the new Responses API format.

• Adds complete Responses API service layer with types and handlers
• Implements bidirectional translation between Anthropic messages and Responses payload format
• Extends the existing messages handler to route compatible models to the new Responses API

Reviewed Changes

Copilot reviewed 11 out of 11 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
src/services/copilot/create-responses.ts	Defines Responses API types and service layer for calling the new endpoint
src/routes/responses/route.ts	HTTP route handler for the /responses endpoint
src/routes/responses/handler.ts	Core request handling logic with model validation and streaming support
src/routes/responses/utils.ts	Utility functions for extracting vision and initiator information from requests
src/routes/messages/responses-translation.ts	Translation layer between Anthropic and Responses API formats
src/routes/messages/responses-stream-translation.ts	Stream event translation for real-time responses
src/routes/messages/handler.ts	Updates messages handler to route to Responses API for compatible models
src/services/copilot/get-models.ts	Extends model interface with new capabilities and endpoint support
src/server.ts	Registers new /responses routes
tests/translation.test.ts	Unit tests for message translation functionality
tests/responses-stream-translation.test.ts	Unit tests for stream event translation

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