Localize signal snapshot source in notifications

[Pigbibi]

Summary

• render signal snapshot price sources with localized labels instead of raw enum values
• localize quote-overlay yes/no/unknown through QuantPlatformKit helpers

Verification

• PYTHONPATH=.:../QuantPlatformKit/src ../QuantPlatformKit/.venv/bin/python -m py_compile notifications/telegram.py
• PYTHONPATH=.:../QuantPlatformKit/src ../QuantPlatformKit/.venv/bin/ruff check notifications/telegram.py
• git diff --check

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Keep imports compatible with pinned QuantPlatformKit

In the CI and Docker paths I checked, the app installs requirements.txt, which pins QuantPlatformKit to 86d72631c76f27c668b234704b91241bec8fa9ee; that version's common.notification_localization only exports localize_notification_text, not these two new helpers. With the pinned dependency, importing notifications.telegram now raises ImportError before any notification code can run, so either the requirements pin needs to be advanced with this change or these helpers need a local compatibility fallback.

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