feat: US market code 정합성, Telegram 명령 4종, 손절 모니터링 (#132)

- MARKET_SHORTHAND + expand_market_codes()로 config "US" → schedule "US_NASDAQ/NYSE/AMEX" 자동 확장
- /report, /scenarios, /review, /dashboard 텔레그램 명령 추가
- price_change_pct를 trading_cycle과 run_daily_session에 주입
- HOLD시 get_open_position 기반 손절 모니터링 및 자동 SELL 오버라이드
- 대시보드 /api/status 동적 market 조회로 변경

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

src/dashboard/app.py

@@ -26,7 +26,19 @@ def create_dashboard_app(db_path: str) -> FastAPI:
     def get_status() -> dict[str, Any]:
         today = datetime.now(UTC).date().isoformat()
         with _connect(db_path) as conn:
-            markets = ["KR", "US"]
+            market_rows = conn.execute(
+                """
+                SELECT DISTINCT market FROM (
+                    SELECT market FROM trades WHERE DATE(timestamp) = ?
+                    UNION
+                    SELECT market FROM decision_logs WHERE DATE(timestamp) = ?
+                    UNION
+                    SELECT market FROM playbooks WHERE date = ?
+                ) ORDER BY market
+                """,
+                (today, today, today),
+            ).fetchall()
+            markets = [row[0] for row in market_rows] if market_rows else []
             market_status: dict[str, Any] = {}
             total_trades = 0
             total_pnl = 0.0