feat: add market regime filter and compound reinvestment

- Add market_regime.py: BTC/ETH/SOL/XRP weighted 2h trend score
  Bull(≥+1.5%) / Neutral / Bear(<-1%) regime detection with 10min cache
- strategy.py: dynamic TREND/VOL thresholds based on current regime
  Bull: 3%/1.5x, Neutral: 5%/2.0x, Bear: 8%/3.5x
- price_collector.py: always include leader coins in price history
- trader.py: compound reinvestment (profit added to budget, floor at initial)
- notify.py: regime info in hourly report, P&L icons (✅/❌, 💚/🔴)
- main.py: hourly status at top-of-hour, filter positions held 1h+
- backtest.py: timestop/combo comparison modes

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

core/price_collector.py

@@ -9,6 +9,7 @@ import pyupbit
 import requests
 
 from .market import get_top_tickers
+from .market_regime import LEADERS
 from .price_db import cleanup_old_prices, insert_prices, insert_prices_with_time
 
 logger = logging.getLogger(__name__)
@@ -27,6 +28,10 @@ def backfill_prices(hours: int = 48) -> None:
     if not tickers:
         logger.warning("[백필] 종목 목록 없음, 스킵")
         return
+    # 대장 코인 항상 포함
+    for leader in LEADERS:
+        if leader not in tickers:
+            tickers = tickers + [leader]
 
     count = hours + 2  # 여유 있게 요청
     total_rows = 0
@@ -59,6 +64,10 @@ def run_collector(interval: int = COLLECT_INTERVAL) -> None:
             tickers = get_top_tickers()
             if not tickers:
                 continue
+            # 대장 코인은 top20 밖이어도 항상 포함
+            for leader in LEADERS:
+                if leader not in tickers:
+                    tickers = tickers + [leader]
             resp = requests.get(
                 "https://api.upbit.com/v1/ticker",
                 params={"markets": ",".join(tickers)},