SEP-1788: Validate detail_view paths against the serialized row

[olucasandrade]

Summary

Align the detail-view conformance check with the list-view column gate: compare each detail_view path root against serialized_field_names(detail_model) instead of model_fields.

• An excluded root (Field(exclude=True)) is now reported; a @computed_field root is accepted; an aliased field is accepted only under its wire name.
• Path grammar is unchanged (data.* exemption, root-segment-only resolution, _detail_response_model fallback). No live app views or response models needed a patch.

SEP-1788

Tested

• Open PostgreSQL Backups (/backups/postgresql), open an existing task detail, confirm hostname / host / port / backup_type / created_at / updated_at still render (not em-dashes)
• Open MySQL Backups → Restore, open an existing restore detail, confirm hostname / destination host / destination port still render
• Confirm /admin/apps still loads and no app is newly blocked by the conformance suite (CI test_registry_migrated_app_structural_checks)

Checklist

• New/modified functions have type hints and rST docstrings
• New tests added for new features or bug fixes
• All tests pass locally (make test) (covering framework suite 249 passed / 11 skipped; full suite 10060 passed; 82 pre-existing sidecar declare -A failures on macOS bash and 1 pre-existing AES256 restore round-trip — neither touched by this change)
• Pre-commit hooks pass (make run-pre-commit) (commit hooks + make lint exit 0)
• Database migrations generated if models changed (make makemigrations) (N/A)
• User-facing changes documented (README, inline help, UI text) (N/A)
• Configuration changes documented with examples (N/A)
• Changelog fragment added under changelog.d/ (N/A — internal conformance detector; no live UI change)