Summary

• add local-server placeholder routes for Local Studio file-preview fallback assets
• keep /studio/static as the real CSS/JS owner so app initialization is not duplicated
• cover the fallback routes in Studio route tests

Tests

• PYTHONDONTWRITEBYTECODE=1 poetry run python3 -m pytest tests/test_studio_routes.py -q -p no:cacheprovider
• PYTHONDONTWRITEBYTECODE=1 poetry run python3 -m pytest tests/test_demo_evidence_report.py -q -p no:cacheprovider
• PYTHONDONTWRITEBYTECODE=1 poetry run python3 -m pytest -q -p no:cacheprovider
• poetry run inferedgelab portfolio-demo-check
• Browser: /studio Load Demo Evidence path, no console warnings/errors, root fallback requests return 200