Routine test-sync PRs for DataSpaceBackend #223/#235 and DataSpaceFrontend #492 reviewed and merged #189

What: pr-test-sync PRs for DataSpaceBackend #223 and #235 and DataSpaceFrontend #492, reviewed and merged. #184's prefix test used the first title's prefix. "Mod" (from "Model") is in all 89 AI model titles on dev, so the test would fail its narrowing check whenever that title came first.
Evidence: dev: #174 1 passed, #184 2 passed, #186 2 passed. Prod: #174/#184 skip via deployed_pr, #186 isn't readonly. #184 with the gate removed on prod fails at its assertion ('Ope' not found).
Fix: #174, #184 (now uses the rarest prefix), #186, merged 2026-10-07..09. Each CI run green.