feat: allow config NEXT_PUBLIC_BATCH_CONCURRENCY

[fatelei]

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Summary

fix #28611 #30005

allow config NEXT_PUBLIC_BATCH_CONCURRENCY

Screenshots

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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 introduces a new configuration option, NEXT_PUBLIC_BATCH_CONCURRENCY, allowing users to define the number of concurrent batch operations within the Dify web application. This change moves a previously hardcoded limit into a configurable environment variable, providing greater flexibility for optimizing performance and resource management, particularly for features like text generation that utilize batch processing.

Highlights

• Configurable Batch Concurrency: Introduced a new environment variable, NEXT_PUBLIC_BATCH_CONCURRENCY, allowing users to customize the number of concurrent batch operations.
• Dynamic Group Size: Replaced a hardcoded GROUP_SIZE value in the text generation component with the newly configurable BATCH_CONCURRENCY.
• Frontend Integration: Integrated the BATCH_CONCURRENCY setting into the web application's global configuration and dataset attributes for dynamic access across the frontend.

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[gemini-code-assist]

Code Review

This pull request introduces a new environment variable, NEXT_PUBLIC_BATCH_CONCURRENCY, to make the concurrency of batch processing configurable. The implementation correctly replaces the previously hardcoded value. My review focuses on improving the naming consistency of the new configuration key to align with existing conventions in the codebase, which will enhance readability and maintainability.

[crazywoola]

This configuration should be added to the docker/.env.example as well.

[fatelei]

This configuration should be added to the docker/.env.example as well.

done