Include dynamic volatility context in Telegram logs

[Pigbibi]

Summary

• add SOXL dynamic volatility Telegram translations in zh/en
• include dynamic threshold fields in signal_snapshot logs
• add snapshot coverage for rolling-threshold metadata

Verification

• PYTHONPATH=/home/ubuntu/Projects/QuantPlatformKit/src python -m pytest tests/test_signal_snapshot.py -q
• PYTHONPATH=/home/ubuntu/Projects/QuantPlatformKit/src python - <<'PY' ... direct build_translator smoke test
• python -m py_compile notifications/telegram.py application/signal_snapshot.py tests/test_notifications.py tests/test_signal_snapshot.py