🐛 fix: fix reasoning output for OpenRouter reasoning models like deepseek-r1

[deephbz]

💻 变更类型 | Change Type

• [x ] ✨ feat

🔀 变更说明 | Description of Change

Business Description

Get reasoning (i.e. deep thinking) outputs for all OpenRouter reasoning models, and display them in lobe-chat UI.

Fully tested: unittests as well as integration testing.

Technical Description

Unlike most other DeepSeek-R1 providers which simply return <think> ... </think> inside reply messages. OpenRouter use a separate "reasoning" key to return reasoning outputs. Besides it requires add include_reasoning=True in payload. See their docs.

Therefore, to support it we need two changes:

1. Set include_reasoning=True by using handlePayload callback. This does not affect non-reasoning models at all. Verification:
   -you could see reasoning outputs in response:
   
2. Transform the response stream from

{'role': 'assistant', 'content': None, 'reasoning': 'Okay'}
{'role': 'assistant', 'content': 'start-content', 'reasoning': ''}
{'role': 'assistant', 'content': 'foo bar', 'reasoning': ''}

to

{'role': 'assistant', 'content':  '<think>Okay'}
{'role': 'assistant', 'content': '</think>start-content'}
{'role': 'assistant', 'content': 'foo bar'}

This transformed content is consistent with other platforms - a single 'content' stream of thinking then normal output tokens. Therefore, the part gets automatically picked up and displayed.

Verification:

📝 补充信息 | Additional Information

Solves #5766 , related #5860

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TestGru Assignment

Summary

Link	CommitId	Status	Reason
Detail	7c7b5ba	🚫 Skipped	No files need to be tested {"src/config/modelProviders/openrouter.ts":"The code does not contain any functions or classes.","src/libs/agent-runtime/openrouter/index.ts":"no test value"}

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[deephbz]

build passed:

[lobehubbot]

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---

build passed:

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Name	Status	Preview	Comments	Updated (UTC)
lobe-chat-preview	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Feb 12, 2025 3:33am

[deephbz]

The latest updates on your projects. Learn more about Vercel for Git ↗︎

Name Status Preview Comments Updated (UTC)
lobe-chat-preview ✅ Ready (Inspect) Visit Preview 💬 Add feedback Feb 12, 2025 3:33am

Integration test looks good:

[arvinxx]

LGTM now. Thanks for your great job!

[lobehubbot]

❤️ Great PR @deephbz ❤️

The growth of project is inseparable from user feedback and contribution, thanks for your contribution! If you are interesting with the lobehub developer community, please join our discord and then dm @arvinxx or @canisminor1990. They will invite you to our private developer channel. We are talking about the lobe-chat development or sharing ai newsletter around the world.
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[lobehubbot]

🎉 This PR is included in version 1.53.1 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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