feat: volume-lead strategy with compounding, WF filter, and DB-backed simulation

- core/strategy.py: replace trend strategy with volume-lead accumulation
  (vol spike + 2h quiet → signal, +4.8% rise → entry)
- core/trader.py: compound budget adjusts on both profit and loss (floor 30%)
- core/notify.py: add accumulation signal telegram notification
- ohlcv_db.py: Oracle ADB OHLCV cache (insert, load, incremental update)
- sim_365.py: 365-day compounding simulation loading from DB
- krw_sim.py: KRW-based simulation with MAX_POSITIONS constraint
- ticker_sim.py: ticker count expansion comparison
- STRATEGY.md: full strategy documentation
- .gitignore: exclude *.pkl cache files

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

.gitignore

@@ -3,3 +3,4 @@ __pycache__/
 *.pyc
 .venv/
 *.log
+*.pkl