Localize signal snapshot source in notifications

[Pigbibi]

Summary

• render signal snapshot price sources with localized broker labels instead of raw enum values
• localize quote-overlay yes/no/unknown through QuantPlatformKit helpers
• add coverage for the LongBridge SOXL/SOXX heartbeat snapshot copy

Verification

• PYTHONPATH=.:../QuantPlatformKit/src:../UsEquityStrategies/src ../QuantPlatformKit/.venv/bin/pytest tests/test_notifications.py -q
• PYTHONPATH=.:../QuantPlatformKit/src:../UsEquityStrategies/src ../QuantPlatformKit/.venv/bin/ruff check notifications/renderers.py tests/test_notifications.py
• git diff --check

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Update QuantPlatformKit pin before importing new helpers

In a clean install from requirements.txt, this module imports quant-platform-kit at pinned commit 86d72631c76f27c668b234704b91241bec8fa9ee; checking that pinned notification_localization.py shows it only exports translator_uses_zh and localize_notification_text, not localize_price_source_label or localize_quote_overlay_state. These new imports therefore raise ImportError as soon as notifications.renderers is imported, preventing notification rendering and any startup path that imports it. Please update the dependency pin together with this change or keep local fallbacks.

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