Preserve column names in page

[klaidliadon]

No description provided.

[Copilot]

Pull request overview

This PR ensures pagination order-building does not mutate caller-provided Page state (notably Page.Sort), preserving original column names while still generating sanitized SQL for ORDER BY.

Changes:

• Update Page.GetOrder to copy p.Sort before sanitizing, preventing in-place modification of the original slice.
• Extend pagination tests to assert page.Column / page.Sort[*].Column remain unchanged after query preparation.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
page.go	Copies Page.Sort before sanitization to avoid mutating caller input.
page_test.go	Adds assertions verifying Page inputs (Column/Sort columns) are preserved across query preparation.

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