refactor(redirect): simplify internal abstractions for redirect handling

[0x676e67]

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[Copilot]

Pull request overview

This PR refactors redirect handling to remove the generic redirect policy trait and instead route redirect decisions through a single internal FollowRedirectPolicy, simplifying the redirect middleware’s type surface.

Changes:

• Replace the generic redirect Policy trait with concrete FollowRedirectPolicy methods (redirect, for_request, on_request, on_response).
• Simplify public redirect Action into a tuple wrapper and adjust pending-action wiring to map into internal redirect::Action.
• Narrow redirect middleware to operate on the crate Body type (instead of generic request bodies).

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
src/redirect.rs	Refactors redirect Action wrapper and pending action mapping; moves redirect policy logic into FollowRedirectPolicy methods.
src/client/layer/redirect/policy.rs	Removes the generic Policy trait, leaving only redirect attempt/action types for the middleware.
src/client/layer/redirect/future.rs	Updates redirect future to use FollowRedirectPolicy directly and simplifies body cloning mechanics.
src/client/layer/redirect.rs	Refactors redirect layer/service to use FollowRedirectPolicy directly and only operate on crate Body.
src/client.rs	Updates the client service stack type alias to match the new redirect middleware type signature.

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