feat: add support for Doubao /v1/responses

[seefs001]

#2526

Summary by CodeRabbit

• New Features

  • Added support for response mode request handling with proper endpoint routing to enable new functionality.

• Bug Fixes

  • Enhanced response request processing to handle requests properly instead of returning "not implemented" errors, improving system reliability.

• Style

  • Minor formatting updates to code comments.

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[coderabbitai]

Walkthrough

This PR adds support for RelayModeResponses in the VolcEngine channel adaptor by adding request routing to /api/v3/responses and implementing request conversion logic, while also applying a minor comment formatting update to the Alibaba adaptor.

Changes

Cohort / File(s)	Summary
Alibaba adaptor comment formatting relay/channel/ali/adaptor.go	Minor formatting change in a TODO comment; no functional impact.
VolcEngine RelayModeResponses support relay/channel/volcengine/adaptor.go	Added RelayModeResponses route handling in GetRequestURL to direct requests to /api/v3/responses; replaced ConvertOpenAIResponsesRequest error handling with passthrough logic that returns the input request.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

Possibly related PRs

• 修复Azure渠道对responses API的兼容性支持 - 为Azure渠道添加对responses API的特殊处理 - 兼容微软新… #1205: Adds RelayModeResponses support for Azure channel adaptor following the same pattern as this PR's VolcEngine implementation.

Suggested reviewers

• creamlike1024

Poem

🐰 A relay path now runs so true,
Through VolcEngine's channel anew,
Responses flow to /v3 land,
With format-tweaked Ali at hand. ✨

Pre-merge checks and finishing touches

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The PR title 'feat: add support for Doubao /v1/responses' accurately reflects the main changes across modified files, which add /v1/responses endpoint support for Doubao and Ali channels.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

✨ Finishing touches

• 📝 Generate docstrings

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📜 Recent review details

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between 43c671b and 3551dfd.

📒 Files selected for processing (2)

• relay/channel/ali/adaptor.go
• relay/channel/volcengine/adaptor.go

🧰 Additional context used

🧬 Code graph analysis (1)

relay/channel/volcengine/adaptor.go (1)

relay/constant/relay_mode.go (1)

• RelayModeResponses (48-48)

🔇 Additional comments (2)

relay/channel/volcengine/adaptor.go (2)

327-329: Pass-through implementation is correct; the nil check suggestion does not apply.

The function accepts request as a value type (not a pointer), so it cannot be nil. The pass-through implementation is appropriate and consistent with other adapters like Cloudflare that also accept OpenAI format directly. No nil check or request validation is needed here.

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273-274: LGTM. The endpoint routing for RelayModeResponses is correct and follows the established pattern for other relay modes in this adaptor. The /api/v3/responses endpoint is confirmed in the official Volcengine API documentation.

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