fix(db): renumber duplicate migration 000057_cleanup_universal_plans to 000060 (closes #970)

[cristim]

Summary

• Two migrations shared version 000057: 000057_drop_user_role_to_groups (already applied on live DBs) and 000057_cleanup_universal_plans (merged via ops(plans): migration to clean up universal plans (closes #742) #802, not yet applied). golang-migrate requires unique version numbers and will refuse to run with a collision.
• Renumbers cleanup_universal_plans from 000057 to 000060 (a free slot between 000059 and 000063) via git mv on all three files (.up.sql, .down.sql, _test.go).
• Updates version references in SQL comments and test assertions. 000057_drop_user_role_to_groups is untouched.

Test plan

• pre-commit run check-migration-conflicts --all-files passes (no duplicate)
• gofmt -l clean on renamed test file
• go vet ./internal/database/... ./internal/config/... no issues
• go build ./... succeeds
• go test ./internal/database/... ./internal/config/... -count=1 731 tests pass

Closes #970

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

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Run ID: d60c8f96-b4fb-4a4a-9b50-680f39aa7f80

📥 Commits

Reviewing files that changed from the base of the PR and between 69b857a and f253203.

📒 Files selected for processing (3)

• internal/database/postgres/migrations/000060_cleanup_universal_plans.down.sql
• internal/database/postgres/migrations/000060_cleanup_universal_plans.up.sql
• internal/database/postgres/migrations/000060_cleanup_universal_plans_test.go

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/970-dup-migration-000057

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[cristim]

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