[Chore/Refactor] remove redundant-cast

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Description

Many are leaving redundant-cast.

how to do it:

go to a check log like https://github.com/langgenius/dify/actions/runs/17258598012/job/48975128610 (you can choose any related log)

search for is the same type as in pyrefly check, and fix them.

example #24646

Motivation

Clean code.

Additional Context

https://pyrefly.org/en/docs/error-kinds/#redundant-cast