Refactor to use reflect.TypeFor

[cuiweixie]

Closes:

[Copilot]

Pull Request Overview

This PR refactors the code to use the newer reflect.TypeFor function instead of the older reflect.TypeOf(...).Elem() pattern for obtaining type information.

• Replaces reflect.TypeOf((*json.Unmarshaler)(nil)).Elem() with reflect.TypeFor[json.Unmarshaler]()

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