Add an owner-gated dashboard to remap any tool/tier's model live without a
code push. Overrides live in dbn_tool_engine_config (dobetternorge_maindb)
and are consulted by dbnToolsResolveToolRun() + dbnToolsReviewerModel();
no row = unchanged code/.env behaviour (fully back-compatible).
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
