feat: initial upbit auto-trader implementation

Strategy C: volatility breakout (Larry Williams K=0.5) AND momentum
(MA20 + 2x volume surge) must both trigger for a buy signal.

Hard rules:
- Trailing stop: sell when price drops -10% from peak
- Max budget: 1,000,000 KRW total, up to 3 positions (333,333 KRW each)
- Scan top 20 KRW tickers by 24h trading volume every 60s
- Monitor positions every 10s

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

daemon/runner.py

@@ -0,0 +1,46 @@
+"""매수 기회 스캔 루프 - 60초마다 전체 시장 스캔."""
+
+import logging
+import time
+
+from core import trader
+from core.market import get_top_tickers
+from core.strategy import should_buy
+
+logger = logging.getLogger(__name__)
+
+SCAN_INTERVAL = 60  # 초
+
+
+def run_scanner() -> None:
+    """메인 스캔 루프."""
+    logger.info(f"스캐너 시작 (주기={SCAN_INTERVAL}초)")
+    while True:
+        try:
+            # 포지션 꽉 찼으면 스캔 스킵
+            if len(trader.get_positions()) >= trader.MAX_POSITIONS:
+                logger.info("포지션 최대치 도달, 스캔 스킵")
+                time.sleep(SCAN_INTERVAL)
+                continue
+
+            tickers = get_top_tickers()
+            logger.info(f"스캔 시작: {len(tickers)}개 종목")
+
+            for ticker in tickers:
+                # 이미 보유 중인 종목 제외
+                if ticker in trader.get_positions():
+                    continue
+
+                try:
+                    if should_buy(ticker):
+                        logger.info(f"매수 신호: {ticker}")
+                        trader.buy(ticker)
+                    time.sleep(0.15)  # API rate limit 방지
+                except Exception as e:
+                    logger.error(f"스캔 오류 {ticker}: {e}")
+                    time.sleep(0.3)
+
+        except Exception as e:
+            logger.error(f"스캐너 루프 오류: {e}")
+
+        time.sleep(SCAN_INTERVAL)