Fixes 14217: database retrieve api and chat-messages api response doc_metadata

[yuhaowin]

Summary

Fixes #14217
database retrieve api and chat-messages api response doc_metadata

Screenshots

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Checklist

Important

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

[absent1706]

Did similar changes recently. Worked as well for me. Would be really glad if Dify team could merge this. Also looking how to update UI part to render link if it's passed in doc metadata

[crazywoola]

Did similar changes recently. Worked as well for me. Would be really glad if Dify team could merge this. Also looking how to update UI part to render link if it's passed in doc metadata

@absent1706 Can you explain more regarding "Also looking how to update UI part to render link if it's passed in doc metadata", you can open an issue to talk about this.