add optional swapped with, allows check for swapped given_name/name fields

[mabiede]

No description provided.

[Copilot]

Pull request overview

This PR enhances the duplicate-contact detection logic so that contacts are also detected as duplicates when given_name and name were entered swapped (e.g., John Doe vs Doe John). It updates the duplicate similarity SQL generation and its prefilter (“blocking”) logic, and adds a regression test plus a changelog entry.

Changes:

• Add swapped_with metadata to compared columns to express name/given-name swap counterparts.
• Extend similarity scoring and blocking conditions to treat consistent swaps as a match (while keeping the block selective by requiring both swap directions).
• Add an Alcotest regression case for swapped firstname/lastname, and document the behavior change in the changelog.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated no comments.

File	Description
pool/test/duplicate_contacts_test.ml	Adds a test asserting swapped first/last names are detected as duplicates with score 1.0.
pool/app/duplicate_contacts/repo.ml	Updates generated SQL for similarity scoring and blocking to account for swapped name/given_name pairs.
pool/app/duplicate_contacts/entity.ml	Introduces Column.swapped_with and configures swap pairing for name ↔ given_name.
CHANGELOG.md	Notes the duplicate-check behavior change under unreleased.

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