fix: align callback return types with base class

[rushikeshadhav]

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Summary

Explicitly annotate both the base method and all overrides with -> None in their signatures

Fixes - #30853

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 make lint and make type-check (backend) and cd web && npx lint-staged (frontend) to appease the lint gods

[gemini-code-assist]

Summary of Changes

Hello @rushikeshadhav, 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 focuses on enhancing code quality and maintainability by standardizing the return type annotations for callback methods. By explicitly marking these methods as returning None, it improves the accuracy of type checking, making the codebase more robust and easier for developers to understand and work with, particularly when using static analysis tools.

Highlights

• Type Hinting Consistency: Explicitly added -> None return type annotations to several callback methods in both the base callback class and its logging implementation. This ensures type signature alignment and improves code clarity for static analysis.

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[gemini-code-assist]

Code Review

This pull request correctly aligns the return type annotations of callback methods in the base class and its implementation. By explicitly adding -> None to the signatures in both base_callback.py and logging_callback.py, the code becomes more type-safe and easier to understand for both developers and static analysis tools. The changes are consistent and follow Python best practices for type hinting. This is a good improvement for code quality and maintainability.