Infer quote overlay state in notifications

[Pigbibi]

Summary

• infer quote-overlay state from known signal snapshot source names
• keep explicit quote_overlay_used values authoritative

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]

Classify mixed market quote sources as no-overlay

When latest_price_source is mixed_market_quote_snapshot_close or mixed_market_quote_historical_close (both recognized source names in this module's localization table), this inference still returns None because those names are not in the no-overlay set and do not contain with_live_quote_overlay. Since build_signal_snapshot() leaves absent quote_overlay_used as None, notifications for those known non-overlay sources will continue to render quote overlay unknown, defeating the new inference for those snapshot source names.

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