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The overseas ranking API was returning 404 for all exchanges because the
TR_IDs, API paths, and exchange codes were all incorrect. Updated to match
KIS official API documentation:
- TR_ID: HHDFS76290000 (updown-rate), HHDFS76270000 (volume-surge)
- Path: /uapi/overseas-stock/v1/ranking/{updown-rate,volume-surge}
- Exchange codes: NASD→NAS, NYSE→NYS, AMEX→AMS via ranking-specific mapping
Fixes #141
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>