zephyrdark 3e723b6146 feat: add valuation data collector
Add ValuationCollector class that fetches PER, PBR, and dividend yield
data from KRX for all listed stocks. Includes business day validation,
safe float conversion, and upsert logic for the valuations table.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
2026-02-02 23:48:08 +09:00
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2026-02-02 23:48:08 +09:00