Remove legacy crisis alert email config

[Pigbibi]

Summary

• remove CRISIS_ALERT_EMAIL_TO and CRISIS_ALERT_EMAIL_FROM from runtime config, env examples, and Cloud Run env sync
• document Google Voice notification config as the only crisis alert recipient surface
• update QuantPlatformKit and UsEquityStrategies pins to the Google Voice-only cleanup commits

Tests

• PYTHONPATH=/home/ubuntu/Projects/QuantPlatformKit/src:/home/ubuntu/Projects/UsEquityStrategies/src:. .venv/bin/python -m pytest tests/test_runtime_config_support.py tests/test_rebalance_service.py tests/test_sync_cloud_run_env_workflow.py