[Entity-Service] Support sortBy on POST /users/search for the Postgres data source

[Rashmika998]

Summary

POST /users/search on the Postgres data source rejected any sortBy:

Bad request: POST /users/search: sortBy is only supported for the ServiceNow data source

The OpenAPI contract already advertises sortBy (name / createdOn / updatedOn) for this endpoint, and the CSM users page always sends {"field": "name", "order": "asc"}, so that page's search returned a 400.

• The service now validates the sort the same way the ServiceNow adapter does (unknown field, order without a field, unknown order are still validation errors).
• The repository maps the validated field to a fixed SQL expression; request text never reaches SQL. name sorts case-insensitively on the display name, falling back to first + last name and then the user name, because "user".name is empty for a few synced rows (5 of 2,937 in staging). u.id is always the last tie-break so pages are stable across offsets.
• No sortBy keeps the previous newest-first default.

Verification

• Ran the real service and repository against staging: five sorts (name asc, name desc, createdOn desc, updatedOn asc, name with order omitted), each compared to hand-written SQL across four pages, including page boundaries and the tail. All match. The default order still works (total 2,937).
• New unit tests for the service validation (7 cases) and for userOrderBy, including that an unknown field falls back to the default and never reaches SQL.
• gofmt, go vet, gosec (0 issues), govulncheck clean. go test has one failure, TestSNCaseService_CreateCase_PublishesCaseCreated, which fails the same way without this change.

🤖 Generated with Claude Code

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📥 Commits

Reviewing files that changed from the base of the PR and between d827781 and e720c1c.

📒 Files selected for processing (7)

• entity-service/CLAUDE.md
• entity-service/internal/repository/user_repo.go
• entity-service/internal/repository/user_repo_test.go
• entity-service/internal/service/case_service_test.go
• entity-service/internal/service/user_service.go
• entity-service/internal/service/user_service_test.go
• entity-service/openapi.yaml

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