Fix duplicate Data Management restore endpoint

[Paul Lizer (paullizer)]

Summary

• remove the obsolete duplicate Data Management restore review route that prevented Flask Blueprint registration
• retain the authorization-aware restore review handler and add endpoint uniqueness regression coverage
• bump the application to 0.250.111 and add fix/release documentation

Validation

• real application import succeeds with exactly one backend_data_management.review_admin_data_management_restore endpoint
• python -m pytest functional_tests/test_data_management_security_patterns.py -q (6 passed)
• mandatory route policy tests (12 passed)
• Pylance syntax checks and git diff --check pass

Known test issue

• test_data_management_restore_workflow.py passes, while two neighboring history-pagination tests fail on an existing test stub that omits cleanup_expired_data_management_backups; this branch does not change that fixture or import