Update Code Generator to use the currently configured model.

[Kota-Yamaguchi]

Checklist:

Important

Please review the checklist below before submitting your pull request.

• Please open an issue before creating a PR or link to an existing issue
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I ran dev/reformat(backend) and cd web && npx lint-staged(frontend) to appease the lint gods

Description

The code generator could only use gpt4-o-mini, which was inconvenient because it required users to have a ChatGPT API key configured. This update allows the code generator to utilize the currently configured model, making it more flexible and user-friendly.

Fixes

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update, included: Dify Document
• Improvement, including but not limited to code refactoring, performance optimization, and UI/UX improvement
• Dependency upgrade

Testing Instructions

You can verify this by setting a system model other than ChatGPT and then running the Code Generator. It will clearly display which model the Code Generator is using, making it easy to confirm.