feat: add agent thinking content display of deepseek R1

[hjlarry]

Summary

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Close issue syntax: Fixes #<issue number> or Resolves #<issue number>, see documentation for more details.

fix #12891

It will wrap the thinking content with markdown's quote

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Please review the checklist below before submitting your pull request.

• This change requires a documentation update, included: Dify Document
• I understand that this PR may be closed in case there was no previous discussion or issues. (This doesn't apply to typos!)
• I've added a test for each change that was introduced, and I tried as much as possible to make a single atomic change.
• I've updated the documentation accordingly.
• I ran dev/reformat(backend) and cd web && npx lint-staged(frontend) to appease the lint gods

[crazywoola]

LGTM

[laipz8200]

LGTM

[CracKerMe]

Thank you for your efforts, but I am curious about the DeepSeek-R1 deployed by Ollama. The tag display is still incorrect. Will there be continuing repair plans?

[hjlarry]

Thank you for your efforts, but I am curious about the DeepSeek-R1 deployed by Ollama. The tag display is still incorrect. Will there be continuing repair plans?

My Ollama doesn't have enough GPU power to run DeepSeek-R1. Perhaps someone else could implement this feature.

[zxfishhack]

#13409