Index ingested result metadata in portal DB

[yoshifuminakamura]

Summary

• add a Portal SQLite metadata index for ingested benchmark result and estimate JSON records
• populate the index after successful result/estimate ingest while keeping raw JSON files as the authoritative artifacts
• add schema v3 migration and focused tests for metadata extraction, upsert behavior, and ingest hooks

Notes

• existing result and estimated pages remain file-backed
• index failures are audited but do not fail the ingest after the JSON file has been saved

Validation

• /home/nakamura/fugakunext/venv/bin/python -m py_compile result_server/routes/api.py result_server/utils/execution_profiles.py result_server/utils/result_metadata_index.py
• /home/nakamura/fugakunext/venv/bin/python -m pytest result_server/tests/test_execution_profiles.py result_server/tests/test_result_metadata_index.py result_server/tests/test_api_routes.py result_server/tests/test_app_dev_security.py result_server/tests/test_preflight.py
• /home/nakamura/fugakunext/venv/bin/python result_server/tests/run_result_server_tests.py