feat(catalog): overlay local route visibility on mirrored sources

[typelicious]

Summary

• extend the provider source registry to cover anthropic, deepseek, and google in addition to blackbox, kilo, and openai
• persist local route-state and models-endpoint snapshots so key-specific model visibility can be compared against mirrored global provider sources
• surface catalog-vs-route mismatches in provider catalog alerts, doctor, probe, and API summaries

Testing

• env PYTHONPATH=. ./.venv-check-313/bin/pytest -q tests/test_provider_availability.py tests/test_provider_catalog_refresh.py tests/test_provider_catalog_store.py tests/test_config.py tests/test_provider_catalog_api.py tests/test_dashboard_provider_catalog.py
• env PYTHONPATH=. ./.venv-check-313/bin/pytest -q tests/test_menu_helpers.py -k 'provider_probe_surfaces_catalog_alert_actions or doctor_surfaces_provider_source_priority_actions'
• rtk ruff check faigate/provider_sources.py faigate/provider_catalog_store.py faigate/provider_availability.py faigate/provider_catalog_refresh.py faigate/config.py faigate/wizard.py faigate/main.py tests/test_provider_availability.py tests/test_provider_catalog_refresh.py tests/test_provider_catalog_store.py tests/test_config.py tests/test_provider_catalog_api.py tests/test_dashboard_provider_catalog.py
• bash -n scripts/faigate-provider-probe scripts/faigate-doctor scripts/faigate-menu