Reduce RATE_LIMIT_RPS from 10.0 to 5.0 to prevent "초당 거래건수를
초과하였습니다" (EGW00201) errors from KIS API.
Docker logs showed this was the most frequent error (70% of failures),
occurring when multiple stocks are scanned rapidly.
Changes:
- src/config.py: RATE_LIMIT_RPS 10.0 → 5.0
- .env.example: Update default and add explanation comment
Trade-off: Slower API throughput, but more reliable operation.
Can be tuned per deployment via environment variable.
Fixes: #43
Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>