refactor: reorganize project structure into tests/, data/, logs/

- Move all backtest/simulation scripts to tests/
  - Add sys.path.insert to each script for correct import resolution
- Move pkl cache files to data/ (git-ignored)
- Move log files to logs/ (git-ignored)
- Update main.py: trading.log path → logs/trading.log
- Add ecosystem.config.js: pm2 log paths → logs/pm2*.log
- Update .gitignore: ignore data/ and logs/ instead of *.pkl/*.log
- core/fng.py: increase cache TTL 3600→86400s (API updates daily at KST 09:00)

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

tests/trend_check.py

@@ -0,0 +1,45 @@
+import os as _os, sys as _sys
+_sys.path.insert(0, _os.path.dirname(_os.path.dirname(_os.path.abspath(__file__))))
+
+import os
+from dotenv import load_dotenv
+load_dotenv()
+import oracledb
+
+conn = oracledb.connect(user=os.getenv('ORACLE_USER'), password=os.getenv('ORACLE_PASSWORD'),
+    dsn=os.getenv('ORACLE_DSN'), config_dir=os.getenv('ORACLE_WALLET'))
+cur = conn.cursor()
+
+for ticker in ['KRW-DKA', 'KRW-LAYER', 'KRW-SIGN']:
+    cur.execute("""
+        SELECT price, recorded_at FROM price_history
+        WHERE ticker = :t AND recorded_at >= TIMESTAMP '2026-02-28 20:00:00'
+        ORDER BY recorded_at
+    """, t=ticker)
+    rows = cur.fetchall()
+
+    lookback = 12  # 10분봉 * 12 = 2h
+    gains = []
+    for i in range(lookback, len(rows)):
+        curr = rows[i][0]
+        past = rows[i - lookback][0]
+        if past > 0:
+            gains.append((curr - past) / past * 100)
+
+    if not gains:
+        continue
+
+    above_5  = sum(1 for g in gains if g >= 5.0)
+    above_3  = sum(1 for g in gains if g >= 3.0)
+    above_0  = sum(1 for g in gains if g >= 0.0)
+    negative = sum(1 for g in gains if g < 0.0)
+
+    print(f"[{ticker}] 2h 등락률 분포 ({len(gains)}개 틱)")
+    print(f"  평균={sum(gains)/len(gains):+.2f}%  최고={max(gains):+.2f}%  최저={min(gains):+.2f}%")
+    print(f"  +5% 이상(신호): {above_5}건 ({above_5/len(gains)*100:.0f}%)")
+    print(f"  +3%~+5%:        {above_3-above_5}건 ({(above_3-above_5)/len(gains)*100:.0f}%)")
+    print(f"  0%~+3%:         {above_0-above_3}건 ({(above_0-above_3)/len(gains)*100:.0f}%)")
+    print(f"  음전(하락):     {negative}건 ({negative/len(gains)*100:.0f}%)")
+    print()
+
+conn.close()