chore: update gitignore — untrack .claude/, ignore runtime data & logs

- Untrack .claude/settings.local.json (IDE-specific)
- Gitignore: data/bot_status.json, signal_persistence.json, model_metrics.json
- Gitignore: logs/ (all content, not just *.log)
- Gitignore: backtests/.claude/
- Add scripts/check_trade_detail.py utility
- Update data/risk_state.txt to current state

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

data/risk_state.txt

@@ -1,5 +1,6 @@
-date:2026-02-06
-daily_loss:177.60000000000002
-daily_profit:21.73
-consecutive_losses:2
-total_loss:155.87
+date:2026-02-09
+daily_loss:0.0
+daily_profit:7.17
+consecutive_losses:0
+total_loss:0
+saved_at:2026-02-09T07:08:09.193663+07:00