KIS VTS (paper trading) does not return data from the domestic
volume-rank API. The smart scanner had no fallback for KR market,
causing permanent "No candidates" and zero trades all day.
- src/config.py: add KR_FALLBACK_STOCKS with 10 major KRX stocks
(삼성전자, SK하이닉스, NAVER, 현대차, 셀트리온, LG화학, 카카오,
삼성SDI, 삼성바이오로직스, 기아)
- src/main.py: pass KR fallback stocks to scanner.scan() for domestic
markets (mirrors the overseas build_overseas_symbol_universe pattern)
- tests/test_main.py: add TestKrFallbackStocksConfig (3 tests)
Closes#153
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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