refactor: use slices.Backward to simplify the code

[blackflytech]

There is a new function added in the go1.23 standard library, which can make the code more concise and easy to read.

More info can see golang/go#61899

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: abadd6fb-709e-43e1-b49b-cc1c4b933060

📥 Commits

Reviewing files that changed from the base of the PR and between 1020060 and 42c0c64.

📒 Files selected for processing (1)

• internal/scheduler/middleware.go

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📝 Walkthrough

Walkthrough

In internal/scheduler/middleware.go, the manual reverse-index for loop in Chain is replaced with slices.Backward(middlewares), requiring a new slices import. Behavior is unchanged.

Middleware loop refactor

Layer / File(s)	Summary
Use slices.Backward in Chain internal/scheduler/middleware.go	Adds slices import and replaces the explicit for i := len(middlewares) - 1 loop with slices.Backward(middlewares) to iterate in reverse order.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly summarizes the refactor to use slices.Backward.
Description check	✅ Passed	The description is related to the change and explains the new slices.Backward helper.
Docstring Coverage	✅ Passed	Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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[boojack]

LGTM