Release v2.4.0 with metadata catalog refresh

[typelicious]

Summary

• add the metadata catalog 24h refresh tick with persisted sync state and retry backoff
• surface sync issues through build_catalog_alerts for health, dashboard, and API consumers
• add Kilo Auto FAIGate profiles for OpenCode/Codenomad examples
• refresh the bundled catalog snapshot with verified pricing metadata
• bump fusionAIze Gate to v2.4.0 and update CHANGELOG

Verification

• PYTHONPATH=. python3 -m pytest tests/test_config.py tests/test_metadata_catalog_sync.py tests/test_provider_catalog_api.py -q
• PYTHONPATH=. python3 -m ruff check faigate/config.py faigate/catalog_cache.py faigate/catalog_resolver.py faigate/dashboard.py faigate/main.py faigate/provider_catalog_refresh.py tests/test_config.py tests/test_metadata_catalog_sync.py
• PYTHONPATH=. python3 -m ruff format --check faigate/config.py faigate/catalog_cache.py faigate/catalog_resolver.py faigate/dashboard.py faigate/main.py faigate/provider_catalog_refresh.py tests/test_config.py tests/test_metadata_catalog_sync.py
• rtk git diff --check

Notes

• Gate Bar / quota-helper local work is intentionally excluded from this PR; it should move to a separate companion repo such as faigate-bar.