fix: fix when vision is disabled delete the configs

[fatelei]

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Summary

fix #30394

fix when vision is disabled delete the configs

Screenshots

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before

Screen.Recording.2025-12-31.at.14.13.25.mov

after

Screen.Recording.2025-12-31.at.14.12.27.mov

Checklist

• 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

[gemini-code-assist]

Summary of Changes

Hello @fatelei, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request resolves an issue where vision configurations were not correctly cleared when the vision feature was turned off. By introducing a mechanism to explicitly delete these configurations upon disabling vision, the change ensures that the application maintains a clean state and avoids potential conflicts or unexpected behavior stemming from lingering settings.

Highlights

• Configuration Management: Implemented logic to automatically delete vision-related configurations when the vision feature is disabled, ensuring data consistency and preventing stale settings.

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[gemini-code-assist]

Code Review

This pull request correctly fixes a bug where vision configurations were not being deleted when the feature was disabled. The added logic ensures that the configs property is removed from the payload when vision is turned off. I have included one suggestion to improve the clarity and maintainability of the conditional logic.