- add a dedicated /api/gateway/logs endpoint for incremental log polling
- keep /api/gateway/status focused on runtime and health data only
- update frontend log fetching to use the new API and add backend tests covering the status/logs separation and cleared-log behavior
- track boot and config default models in gateway status/events
- preserve running, starting, and restarting states during health checks
- add safer gateway restart handling with stronger backend test coverage
- expose restart-required UI and refresh model state after default model update