Three bugs in test_sync_success_caches_and_returns_models:
1. Mock data lacked taskType=imageInference so normalize_models() filtered
everything out → sync() returned false (empty result).
2. wp_remote_retrieve_response_code and wp_remote_retrieve_body not mocked
→ Brain\Monkey MissingFunctionExpectations.
3. is_wp_error not mocked.
4. get_option/update_option used separate static stores so update_option
write was invisible to the subsequent get_option in get_models().
Replace hardcoded model registry with live-sync system.
New PRAutoBlogger_Runware_Model_Catalog class fetches the Runware model
catalog daily, caches in WP options (24h TTL), and falls back to the
hardcoded 15-model list if the API is unavailable. Sync Now button
in PRAdmin for on-demand refresh. Eliminates the drift that caused
silent model fallback bugs (v0.13.8, v0.14.0).
