✨ feat: Support reasoning output for OpenRouter reasoning models (like deepseek-r1). | 支持读取和展示OpenRouter深度思考输出

[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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[gru-agent]

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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[arvinxx]

this implement is not ok ，please refer to https://github.com/lobehub/lobe-chat/blob/main/src/libs/agent-runtime/utils/streams/openai.ts#L90-L100 ，make OpenRouter 's chunk parser into openai stream

[deephbz]

Done please review.